Field Notebook: WY 1956

Waage, Karl

1956

Yale Peabody Museum of Natural History

Original Source

Source Material:
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org

paleontology stratigraphy fossils Cretaceous Western Interior Seaway ammonoids

Document Pages

148 Pages

1956-2 doc.469 UNITED STATES DEPARTMENT OF THE INTERIOR DI-6 APPROVED DECEMBER 1941

KM. Waage doc. 469 Contents [7787] Thermopolis - Sect #2 E. bent Big Horn R. & Sect "3" - 1 Sheep Mt. - Sect. Greybull ss. ____________ 9. Resume Cloverly - Thermap. to Red Dome _______ 12. Addition to Sheep Mt. Sect. _________________ 15. Crooked Creek area - Partial Haystack section- 18 [7787] Gypsum Cr. section _____________ 21 [7787] Rainbow Canyon _________________________ 25 Cloverly area ____________________________ 29 Section 1a+b __________________________ 29 " " 2 _______________________________ 32 [7787] Hyshville sections _______________________ 37 Cloverly area, section 3a0 _________________ 46 [7787] Tensleep sections ________________________ 54 Muddy Creek section ______________________ 62 Kaycee area _____________________________ 65 West Middle Fork Powder River sections - 65 Notes on Cloverly - castward along Mid Fork of Powder River _____________________________ 70 Thermop.-Tensleep-Hyshville-Cloverly-Sheep Mt-Rainbow-Crooked Cr. (1) (1)1 (1)1 4 1 1 2 -Muddy Kaycee 1 (1)3

Thermopolis - #2. Beginning at Morrison contact, Morrison here is a light greenish gray silty, nowelk, cleystone which grades downward into massive friable greenish gray clest. SS. Morrison (in part) 1.0-? Cleystone, greenish gray, grading to silty and finely sandy clsth within 6". Upper 2 or 3 inches with yellow stain Cloverly 15.0 Conglomerate, massive, hard to friable, court + grit pebble cgl. with fairly well sized pebbles, Av. about 1/2 inch. Varied pebbles with gray + black predom. + numerous brown. Has lenses of lignitic silty to sandy shale and lig siltst. in basal part. Some sandy lenses come in in upper 5.0, laterally upper cgl contact grades + inter fingers with unit above. 1.

1/6/17 Thermopolis - Sect 2 E. Beck Sept 14 + Sect 3 - 1

9.0 Sandstone, coarse and calcic at base to silty + argillaceous at top. Irregularly bedded, x 12m. ledgy, becoming somewhat shaly in upper part. Grades to units above and below. Weathers lite gray to yellowish gray with some streaks of stain. 6.0 Claystone, silty, and argillaceous siltstone, dark gray, with thin interbeds of fine-grained gray sandstone, which weathers with yellow stain. 8.0 Sandstone, fine-grained, locally argillaceous, with some lenses arg. / / acous siltstone. Grades to overlying unit. Beds 5' chiefly 2 SS (soft) beds silty plug. 4.0 Siltstone, argillaceous, grading upward to silty claystone + claystone. Gray becoming drewnish gray to black upward. A silty bed / phase of overlying units.

thermopolis - sect 2 E. deck Sept 14th & Sect 3 - 1

12.0 Claystone, black, to carbonaceous, with some carb. shale in lower 2 feet. Upper 1 to 1.5 claystone is light gray some yellow streaks Base of massive cliff-forming calitic ss. Thermopolis H3, an offset about 150 feet east of where black claystones of Thermop H2 were measured. Morrison 1.6 - ? Claystone, light greenish gray, silty, yellow powdery film on fractures Cloverly? 4.5 + Interbedded lignitic brown shale, silty brown shale and minor thin plugs silt and lignite 11.0 Conglomerate, 1/2" zv, cht+q+zto with upper 6' solid cal. ledge Below about 4 ft loose contorted x bedded white ss 3.

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0-3', then 3' ± lignitic silt-br shale + local SS lenses, basal 1'± yellow-stained cqls at top (whole cql. unit thickens eastward.) 0.5 Shzle, silty, brown, somewhat lignitic 1.0 Siltstone, massive, sandy forms gray-white weather ledge. 8.5 Shzle, brown to lignitic, silty with some interbeds hard gray to black siltstone, Upper 3' of brown lignitic shzle is conglomeratic with scattered gray chert pebbles. 7.0 Interbedded lignitic bra silty shale with lig ptngs and light gray weather-, gray siltstone & silty hard sh. 6.5 Cley stone, black, loc. silty, carb. loc. upper 1.5 becomes light gray.

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3.0 Interbedded fine-grained loc. silty light gray weath, ss and light gray silty to sandy shale. SS bed up to 0.8 ft thick. 65.0 +/- Sandstone, calcy, massive x bed to x/2m, cliff forming, best 2'+ is chart granule cyl locally.. Cyl layer in X beds + stringer thruout. Mostly granule size At top this unit has irregular inter tonguing contact with vericated beds above. 6.5 and fine gr SS Siltstone, locally sandy, clzyry soft blocky, some silty clstn, light green some yellow and red stain. Some thin beds calcareous fine-grin SS. SS unit below intertingers laterally, locally with sharp upper surface with "worm" tracks. 7.0 Sandstone, somewhat argilaceous, vericqated, purple, salmon, green and bluish gray. A very friable 5

(7787) Thermopolis - Sect #2 E bank Big Horn R + Sect '3

unit of qtz + colored cht. in fine grains to granules with scattered polished pebbles (Sample bez full). Weathers like a claystone but relatively little clay in matrix. Becomes clayey at top + grades to overlying unit. 4,0 Intermixed silty to sandy clsty, bottom 1.5 grading to friable, loc. clayey, czlc. Sand with granules, scattered dk-brown to orange-brown masses chert grain to cqlte, limestones, hard weather in concret-like masses. Color variegated purple- gray, some red + yellow 6,0 Chiefly claystone, with loc silty to sandy parts, contains rounded white weath. czlc. concretions up to 6" ± diam. Viz., greenish gray with purple, some yellow spots. Silty-sandy is green, purple commonly clayey 6,0 Intermixed fine sandy green slocs + sandy and silty claystone - red in zone. 6.

[7787] Thermopolis - Sect 2: E bent Big Horn R & Sect '5

6.0 Siltstone, clacy & silty claysone scattered sandgrains. A good "mudstone" if you imply it is a mixture of clay to sand size. Chieffy m3veooy 14.0 Silty claystone and some clygy siltstone, soft, weathers to grayish "popcorn" surface. Upper 3' it is gray, grading to black at top. Below becomes vericgated gray with dk red then red increased downward to underlying unit. 6.0 Sandstone, fine-grained, tabular in beds up to 1ft+, x 12m. Best Surface with "worm" mkd. few other surfaces mkd & some ripples, or but latter not well preserved. Weaths to prominent brown shelving ledge. Heavier beds distinguish it from rusty bed ledge above. 7.0? Siltstone, dacelly jugilleccous, carbonaceous, weathers gray white, platy, Irrey, inter- bedded with czub silty shale 7

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4.07 Siltstone, hard, greenish, weatherous brown. 1.0 ± Siltstone, clayey, fairly soft, weathered khaki brown with orange-red stain. Contact with overlying bed obscure 1.0 ± Glays tone grey to black with platy finess + silt coming in at top. slope wash Probable contact with Rusty bodes. Compare with Thermopolis section # 1, 1955 8.

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Sheep Mountain - Greybull section Starting at soil zone top of Etacung block of Clayealy capped by Greybull near where it plunges under Alluvium to s. (14) 5.0-? Sandstone, fine-gr, ivvey, thin bedded with silty + sandy partings. sh + clstn. (13) 1.4 Claystone silty, massive, grey with o-b stained "veinlets" becomes siltier at base grades to unit below. (12) 2.7 Siltstone, massive gray, clayey at top becoming finely downward grading to unit below. weeths yellow + gray (11) 2.8 Siltstone, massive hard, not clayey - weeths yellow brn, blocky some thin lenses clayey (10) 1.0 Chiefly a brown shale, loc. lignitic, in lower 0.6, grading up to hard compact blue-grey silty clay. 9.

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??? 9 5,8 Claystone, soft plant frags, throughout, blocky to subconch fracture, upper 1ft light gray grading down to black; unit becomes shely & more silty, 14 leave 1.5 foot. (Laterally contains sandy red + tan clay loam with tiny spiculites.) Sampled - Eicher 19 #49) 8 2,0 Interbedded shely Siltstone and fine- gained siltstone, thin beds; weather's hands gray & buff. 7 4,5 Chiefly massive silts. Very fine soft massive gray silt at top becomes harder downward weth to rounded festined and has some mixture of very fine-gr. ss. 6 3,0 Siltstone, blocky when fresh, weath's splintery, grades to shale at base. Upper part (2/3t) olive green with upper 0.5 stained red. Lower foot is a gray silty shale with plant frags, including scaly canifer 5 1,8 Claygy siltstone, blocky, dark gray, some plant frags. Locally where 10.

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plant remnins in overlying unit sparse this grades directly upward into olive green siltstone. 4) 6.5 Siltstone, massive, blocky ledge cuts hard beds up to 10 +, weathers buff with local Fe stain discont. 2) 3.0+ Claystone, massive, waxy gray, with varieg. red, with some scattered Fe specks. in upper few feet, not prolific but definitely in. 1) 1.5 At N end quartz 1 to 2 ft loose fine ss comes in 3.0 ft b/w contact in the red variegated claystone. SS green with black specs. 1) 4.5 Red variegated clstn, silty to a clayey siltstn.. No Fe specks - ? Purplish red clstn

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Resume of Cloverly, Thermop to Red Dome Thermopolis to Hyethville relatively uniform succession - summarized below, for Thermop area. Basal rusty beds, platy silts + i.bm " silty sh. Some i.b. ss at base (#1) Fe stone conc. layers, 1. 2. 3. 4. 5. Disconf. Claystone, dk gray or gray at top becoming red downward 6 7 Claystone, silty to sandy veryq, limestone concs. 8 Frizzle, caltc, sands, variegated, contain polished pebbles 9. Messive, x-bed. calcic ss. prominent unit + hogback terms 10 11 Carbonaceous shalg + siltst. Chert gravel to pebble cgl. 12.

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Tensleep. At Tensleep, interval of units 1 to 4 is quite variable. Possibly only unit 4 is represented by leusing tabular ss. Unit 5 rep. (possibly) by rather thick czvb silt siltsm which is in sharp contact with waxy clstm = to unit 6. Polished pebbles begin within 2 ft. t of contact. Here units 1-4 prob = Greybull. Unit 9 equiv. present but beneath verrecized clstns then platy carb silts. No basal cht pob. can seen. Morrison contact in doubt, Hyettville Probable equiv of units 1-4 down tudy, incl. fairly massive ss holding hogbeck (Check this to See whether green silt in the interval) Unit 5 is quite thick, as at Tensleep, lies in slope. basal few feet platy silts. Unit 6 waxy clstm. Units 6-8 fairly thick. Unit 9 present but broken by interbeds of siltsm & clayey stuff, commonly carb. 15.

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Unit 10 present at least locally 2nd unit 11 in locally as narrow thick channel fill. Sheep Mt. Section remarkably like Thermop. over at top, very unlike in lower part. Unit 1, considerable ss, holds lodge. unit 2 definitely present. 3,4,+5 also but 4 zll silt, 5 very thin. Unit 6 is wzxy with fc pellets hes ss lenses near top, thin, thin clstns which apparently equal 6,7,+8. 8 prob = Moberleys "lithic wacke". Below this section chiefly clsty to Morrison. Very local thin bzsl cql. but 2 cloverly lense 20' above locally may approximate position of unit 9 ss. 14.

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Addition to Sheep Mt. Section Measuring up from top of hogback- towering sandstone. 4) 9.5 Shzle, dk gray to bl., weathers light gray, interbedded with silt, + very silty shzle. Intermittent Fe stone conc. zone about 3' above base. Base 2' obscured, some flaky gray shzle float 3) 0.4 t Siltstone, Fe impreg locally to form platy brown-weathering little hogback slope. It has "fucoidal" markings. 2) 8.5 - 9 to blchy Shzle, dk-gray silty, interbedded and interlaminated with thin beds platy, shaly siltstone. Becomes siltier toward base. 1) 0.6 t Siltstone, Fe-impreg, locally Festone, s persistent low ridge copper weathers purplish brown & appears to be uppermost Festone zone. [illegible] 15.

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This is as far into rusty beds as this section taken. Back to the hogback-forming SS, which could be the type Graybull. SS, have very irregular upper surface, and joint pattern; irregularity could be in part structural, but probably not. A, - about 5' massive x-lam. SS, locally has Fe-stonecrop, fine- to very fine-grained 0.3' sandy ironstone layer comes in at base SS, separating it from 1.0' Seadstone, brown-weather, platy silty to very fine-grss. czlc (zudzy?) Below this about 5' slope wash to top of section in cut.

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Sheep Mt cont. weeks far this To south the ss leases out Following apprv section is about 200 ft S, of cut. Measuring down 19.5 Interbedded shale & pzly siltstone from pzly Fc impref. siltstone (= #1 of preceding section) Fastone conc. Layer 3' above 6250. 5,0 Sandstone, very fine- to fine- grained. It has interbed gray shale 1.0 thick 1/3 from top. Weathers 0-13 to buff. 0.3 Fastone conc. layer 3.4 Sandstone, very fine-grained), silty, weathers dark- brownish gray pzly, some siltst interbeds- irregular. Also thin 0.1 to 0.2 interbeds of Fastone, blue-to purplish-black. Locally 3 of these, but letterally number, varies & Fastones obviously lenticular. From base this to top of unit 10 of section in cut is 14' 17.

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Nozv Crooked Creek - The "Heystack" zone Partial section across Cloverly contact with Greybull-Pustyn (EZZ Crooked Creek) Most of Cloverly exposed is a bedlends in soft highly colored beds, upper part chiefly red and purple claystone-like stuff with popcorn surface Cloverly, top only 1) 5.0 - ? Siltstone, argillaceous, massive, greenish gray, over with red becoming clearer gray about 5' from top. 2) 1.2 Siltstone, soft, shaly, forms yellow weath, small blocky to rounded step in slope gullies. Scrtti, crb fregs. 3) 4.8 Siltstone, massive, very fine-gr., some liverg, crb fregs. Gray, and tan, thegreenish gray with upper part tan, with Fe stained weath, orange bnm to red brm. Sampled 18.

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(2) 7.0 Shale, gray, fissile, finely silty becoming siltier in upper 2.5 with thin irregular interbeds and lamine of silt. (1) 6.4 Sandstone, very fine grained, massive to tabular, cross laminated, weathers yellow brown but with pink stain locally at top. Some silty layers + partings at top. Connects with Eichers Crooked Creek #22 19.

Continuing up slope in rusty beds 3 5,5 - Chiefly shale slope, flaky ss wash 2 13,0 - Platy SS + lb sh + silt to base of unit below. 1 10+ - Ss, fine qr., brown weathering ledge forms cliff slope

Addition to preceding section (base of Eichers E22 Crooked Creek) Starting on top of unit I sandstone of preceding section and measuring up. (7) 0.8+ Sandstone, fine gr and siltstone intermixed, minor clayey siltst, weathers white with Fe br to orange, stain and some red splotches. Locally Fe specks in this zone. (6) 3.0 Claystone, black to gray; at base becomes somewhat glisty as it gets grayer + silther downward. (5) 6.0 Siltstone, massive to platy, gray with some shaly laminato, weathers buff to Fe brown becomes platier upward. Locally at base is 0.2 ironstone with gypsum (4) 12.0 Sandstone platy, with interbeds shaly siltstn + about 4 thin ironstones - one at base step. See above 20

Crooked Creek zvc2 Gypsum Cr - Stone quarry sections #1 On spur just N of fault to N stone quarry along E bluff Gypsum Cr. about 200 ft N of Stone quarry Rd. Top of ridge - Measuring down (Brunton tape or 60W clip) Rusty beds (in part) (14) 7.0+--? Sandstone, very fine-grained, platy, in thin hard, x-laminated, ripple mold + "worm" tracked ledges with interbeds of dk gray to black silty shale + interlam silt. weathers olive brn to light brown. (13) 7.5 Shale, silty, dk gray, interlaminated and thinly interbedded with siltstone and few thin beds fine gr ss. Weathers to brownish gray slope with brn silt + ss chips. (12) 12.0! As above but with numerous interbedded, platy fine-grained ss lycopus up to 0.8 thick, and thin beds dark red brown with ironstone. 21

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11 6.5 Siltstone, massive and gray at base, with irreg, wormy to contorted bedding; above becomes irreg. plenty to locally shale; minor very fine gr sandstone in thin beds, sclattered. Chiefly gray-buff under brown wash.. Plant frags thought-scatt. At here is Fe impreg silt 0.2 - 0.4 with gypsum under? it, loc @ Festino, 10 1.7 Claystone, black, silty, becoming very silty in lower 0.7+ and lighter in color with yellow to tan stain-grades to unit below 9 0.8 2787/ Siltstone, clayey and silty - claystone, blocky tough, Fe stained red and tan, has spherulites ? (see sample #1) 8 2.3 Claystone, tough, silty, blocky, olive gray, slickensided, grades into units above + below, locally has Fe veinlets -and pockets of Fe specks (spherical) which are red stained. Laterally (to N,) [illegible] This unit is variegated with red and is a more pura claystone. 22.

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4.7 Siltstone, at top very clayey to a silty clstn gradational with unit above; downward gets harder, silter + blockier, more carbonaceous changes to a gray blocky siltst. some Fe stain, but mottled gray to light to greenish gray, some solid silty bodies as small irrey lenses. Thinly Interbedded siltstone, silty shale (highly) and sandstone, platy + fissile locally, shaley beds dk gray, rest white cnk frags throught 2.5 Sandstone, fine-grained), platy, x lum. sparkly, numerous round grains, lenticular, has interbeds dark shaly silt plant frags. 6.0 Shale, blocky, gray, silty with 3 or 4 zones Fe impreg. about 0.2 thick. upper foot is more of a claystone. (Sample 2) + lamineae 5.6 thin Shale, silty with interbeds siltst, gray to brown, local carbonaceous & liquidic partings, fissile, plant frags throught. Sample 3 23

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2 2.2 Shale, black, fissile, finely silty Thin layer gyp at base ? 1 4.0 to? Clystone, massive, grey, weathers tan and red upper 1.5 ft, - shot with Fe specks (spherulites) see Sample 4] spherulites thru upper 2' + , into grey, then at about 3.0 red mottling begins & grades rapidly down into prominent red-weathering clsta. 7787 24.

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Rainbow Canyon - contact zone Rusty beds in part Siltstone, weathers gray, some ironstone conchs. in float. 2.0 Soudstone, fine-grained, Fe stained locally Fe copped, chiefly massive X-12m bed. Local fos. Pestone conch's (Sample 1) 7787 11.0 silty Siltstone, irregularly platy with sandy layers but 3 zones of ironstone, one at top, others 1.7 and 8.0 from top. Weathers light gray with yellow stain. ?- 5.0 Clzystone, gray, silty at top grading rapidly downward. within 2 ft to light greenish gray mottled with red Fe specks and spherulite-like black blobs throughout most of it - at least upper 5'. Lower 2' obscure spot shows light gray silty clay (Sample 2) 7789 2.0 Obscured 25

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3.5 Shale, dk gray to black, clayey becoming silty at base. 3.0 Siltstone, massive, sandy, light gray to gray white, locally a silty ss in upper part, grades abruptly to units above and below 4.15 Siltstone, gray, mottled with red (in lower 1.0), (varies), clayey, grading to silty gray shaly clays tone with carb. fragments. Variegated part with Fe violets and blobs. 3.0 Sandstone, very fine grained, qts with grains red + blcht., stained yellow + yellow brn. Frizblo. 1.6 Shale, dark gray fissile, becoming silty upward. Carb. flecks. 3.5 Siltstone, massive, gray-white very fine 2.0 Siltstone, massive as above but clive with local reddish stain. 1.1 Siltstone, as above but gray, possibly more slightly clayey 26

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6.0 Claystone, silty, massive dk gray becoming red-variegated 5.0 - ? Claystone silty, var. red + light gray wathous to big red + maroon fluted fec. 27,

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Cloverly area - sections through contact zone #1.2 Off NE end of Frontier scarp in badlands SW of rd. Measuring down from crest of badland butte. 1.0+ Top of butte capped by plenty iron impreg, thin layer of hard purple-brown weath. siltst, probably no more than few inches thick - may be intermittent 2.5 Siltstone, interlaminated gray & white, very little clay in it. Frizble 6.0 Shale, silty, locally some siltst in thin beds + laminae, dark gray, Fe stained surfaces. Some zones brown sh. 3.0 Siltstone, shaly, and silty to finely sandy shale, locally fissile, some Fe stained silt layers. Chiefly shades of gray. Locally some small fissings purple weath. conks in lower 2' - may contain the fossils found in float. 28

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0.2 Ironstone conc. layer 2.6 Siltstone blocky to shelly, and interbeds silty shaly, gray to light gray, rusty & yellow stain. 1.1 Shale, paper, clay, purple & brown blotchy 2.5 Siltstone, gray to greenish gray massive yellow powdery stain, 0.4t Ironstone conc. layer. 2.0 Siltstone, massive, gray, some fine sand ~? 8.5 chiefly chopper no becoming Claystone, gray... olive brown with irregular blobs light gray throught, latter has yellow powdery stain, some small zones red stain. Locally finely silty. Has spherulites throught. 2.3 claystone, silty, grading to siltstone dark gray & gray splashed with red and blue-black stain. Has 29

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some spherulites 0.8 Sandstone, fine-grained, white, frizble. Locally Fe-impermeabilized to form thin ledge. Laterally this leaves out and unit above rests directly on unit below (offset to E) 5.0 Siltstone, clayey, a silty claystone in upper few inches. Massive mixed, with some sandy patches, light gray with bright red splotches in upper 3.0+ which color out crop a mottled red + gray white. 6.0 Claystone, finely silty, gray, with light brownish cast or mottling on weathering cracks. 3.0 Siltstone, clayey, gray-green to olive with red + orange-red splotches. 5.0 Siltstone, clayey, gray, softer above, becoming hard at base. Ivory brown veinlets, Purple- red ferruginous splotches in 30

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lower 1.0 where it is lighter, greenish 0.4 Sedstone, fine-grained, soft, light gray, grades to units above & below. 2.5 Siltstone, clayey, sandy at top, light gray + greenish gray splashed with bright red from Fe concent. 5.10 Claystone, gradational with above, but darker. Is greenish gray with red splotches, silty, locally a clayey siltstone. 2.10 Sedstone top of locz/ chzncl.: Fine grained, numerous clear minerals, light greenish gray - salt & pepper, weathering to greenish brown ledges. Clayey 3.0 Siltstone, carbonaceous, locally sandy, gray some orange weather cracks - plenty soft. 1.6 Silt, gray clayey, massive, breaks in small pieces 1.5 Claystone, silty + clayey silt, light gray with O-B weather 3)

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spherulitic zones. 2.0-? Chystone, silty gray mottled with red, Cloverly zone #2 South of Cloverly Top of bedlands butte 0.3+ Siltstone, Fe-imregnated, platy. 6.0 Siltstone and silty shale, thinly inter- bedded to interlaminated. Shale gray highly silty- to sully silt. Siltst. white weth. yellow; soft, friable. Lower 0.5+ is platy blue-brown 32

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Fe-impragnated siltst. Grzcks to unit below. 4,2 Shale, thinly interbedded & interlaminated with silt in upper 3.2, lower foot chiefly dark gray finely silty clay shale. Silty part weathers yellowish. 5,2 Siltstone, gray, massive, scurehed, blocky, yellowish stain locally. 1,3 Ironstone in beds to 0.3, siltstone interbeds. Fe stone weathrs bluish black some brown. 2.0 Siltstone, weathers yellow splintery, massive 0.8 bed finely sandy siltstn at base Some shaly gray streaks in middle part. 2,5 Shale dark gray to black, highly silty at top becoming less so downward, lower 0.6 black paperish with carb frags. 33

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1.5 Siltstone, light gray, carb frags pisty at top with gyp seams + yellow efflorescence. B2ccl 0.3 to 0.6 = hard ledge sandy siltstone. 1.2 Siltstone, massive gray, some yellow stain. 0.6 Ironstone conc. zone, brownish purple. 2.5 Siltstone, massive, gray, lower 0.3 t is ledgy. 4.5 Siltstone as above, with yellow powdery stain. 0.9. Sandstone, very fine-grained grading down to siltstone, locally forms thin ledge. Some colored grains. 0.9 Siltstone, light gray, sandy in upper part, massive. ~ ? ~ 2.3 Claystone, gray, local yellow + brn stain, spottily spherolitic, becomes increasingly silty downward & is a clayey silt at base. 34

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1,2 Siltstone, sandy, massive, white, locally a silty - very fine-grained sandstone. 3,0 greenish to olive Chystone, gray with splotches of brick red + red brown, becoming shakly downward + grayer 3,0 Shale, or shakly chystone, black becoming gray at base, grades up & down, #t Chystone at base 2,4 Chystone, light gray to light tan with brown Fe vein-like mks and splotches redbrown in lower half. 0,4 Sandstone, very fine-grained to sandy siltstone. 410-? Chystone, silty gray to tawish gray with brown veinalot - like markings At 1.5 from top begins to get red irony splotches. At 4' on crop - top of fluted-weathering splotchy red zone, On this crop the "gray band" thickens laterally - channel like - it goes from 3ft blksh down to 1.5 of 12st unit 35

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and its basal contact weathers sharp on red below though in section it appears quadrantal.

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Hyethville zrcs #1 #1 Ridge just E of NoWood creek. (Same as Eichers rusty bed section.) About 1 to 2 miles N of Hyethville rd. Begins downslope W side hogback about mi., along the old ridge trail N from Hyethville rd. Dipslope remnant - rusty beds in part 0.4± Siltstone, Fe-impreg, concretionary platy - weather brown to purple A discontinuous set of flat concretions holding local dipslope. 5.6 Covered - spot holes show chiefly siltstone - shaly, thinly interbed, and interlam with silty gray to brownish gray shale. 5.0 Covered. Shalier than above, chiefly black paper shale, with about 0.4 t of brown-weathering siltstone at base 3.5 Interbedded yellow-weather Siltstone and black paper, silty shale. 37

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0.2+ Ironstone zone - patches Fe impreg siltstn alternate laterally with blue-black concretions. 11.0 Covered- interbedded siltstn + bl paper shale. No clazils. 0.2+ Ironstone zone - patches Fe-impreg, siltstn alternate laterally with blue-black concretions. 10.0 Covered. Upper 3.0+ chiefly blt fissile sh with inter/lem silt; lower 7.0 + wazths like soft siltstn. 0.2 Ironstone zone - as others but more continuous [From here down this section touched] 5.6 Shzle, black, some interlam, siltst, which becomes more plentiful downward. 2.6 Shzle, silty, interbedded with thin lygrs + lamine silt, reed-like ltings. ?— 38

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2.5 Claystone, dk grey to black, blocky and waxy at top becoming shiny locally. Silty at base 2.2 Claystone, silty, grey, with local red to yellow Fe stained areas due to weathering of scattered accumulations of spherulites 1.6 Claystone, semi-hard, tough, slickensided, dk grey, becoming finely silty at base. (Appears to be rather local lens) 2.2 Claystone, silty, grey, locally clayey siltstone. Considerable red, yellow + orange stain from spherulite + other Fe accumulations. 1.0-2.0+ Sandstone, fine-grained, cross-bedded to x-lam, massive; weths brown, grey + red with odd hollow cones. Bedding surfaces irregular and ripple-mixd. A very irreg. distributed ss.-surface grooved as though current distributed. to S of our section cuts down about 2'-sharply and more silty clstn + clstn in this 39

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cut area, 4.0+ Siltstone, sandy, platy hard; forms ledge & hogback with SS above, into which it grades. Thinly X-bedded. Weath light gray with yellow & brown stain. 4.0 Siltstone, thinly interbedded & interlaminated with silty shale & shaly silt. 3.2 Shale, dk grey, blocky, finely silty, scst. crb frzqs 1.2 Sandstone, very fine-grained, friable, with thin interbeds & partings silty shale. Stained orange, brn & red. 3.3 Shale, gray to black, finely silty some crb flecks , few thin Silt layers. 3,2 Siltstone, massive, finely sandy, light grey weathers powdery yellow gray. 6.0 Siltstone, 2 hard ledgy gray-white weath. siltst with silty blk shale 40

Offset B Hyethville #1 Offset A Hyethville #1

parting. Upper siltstn, 3.6, grades to unit above; shale 1.4, lower siltstn 1.0. 2 ~ ? 2.0 - ? Claystone, finely silty, gray mottled with red Hyztville #1 - Offset A, Measuring up from thin ss in mid-Cloverly to base of preceding section. Spot checks through crust - not trenched. 5.0 ± Sandstone, massive x-lens, mod-grained with numerous colored grains, becomes clacey (interstitial) in upper part. 4.0 ± Sandstone, clacey, white, grading upward to sandy claystone, yellow + red Fe concentrations - concretion-like. Both these units lens laterally northward to thin platy white zone about 1.0± thick within 100 feet. 16.0 ± beneath this thin lateral extension is dark weath. ss which caps next rise to E + 15 top unit of Offset B. Between two the brick to dark red beds of siltstn. with 10' of very fine ss in lower 3'. 41

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pztng. Upper siltstn 3/8, grades to unit above, sltst 1/4, bzsl siltst. 1.0 10.0+ Chystone, silty to finely sandy, upper limit polished pobblo float locally in this unit. A purple to purple red band 2ft foot of overlying greyish slope. 11.0 Chystone, weather gray with splotches bright red stain. Upper 2't is fine clzycy ss + upper limit of polished pebble float. Sand is tan to gray on fresh, clstu below mottled purplish-gray. 59.0 Chystone, grey with purple gray mottled crust in lower 28.0ft, Then locally a brownish zone- spotty and gray above to contact, the upper part wash covored. of section #1

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Hyaksville #1, offset B, Measuring down from dk weather SS noted bottom of page - in offset A descrip- first page. 1.0-4.0+ Sandstone, variable, very fine-grained to medium grained. Weather chalky gray, locally mod qr pzt friable white with pink stain. Some local spots chertification 9.0 Clays tone, silty, brick red becoming purple downward + gray + highly silty at b250. 2.0 Silstone, gray, massive, some yellowish stain. 11.0 Claystone, dark gray, waxy, becoming silty downward. Lower 5'+15' silty clstn with interbedded-or lensed thin silts. Gray to ten weathers light blue gray much brite yellow silt in float. 28.0 Sandstone, massive, fine-to coarse grained, locally calcic., with 43

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lenses of black silty shale, Siltstone + seems sily liqueur. Unit highly lenticular. May be ?gross regularity with lower massive ss about 6', than 8-10 ft of liquidic channels + lenses than upper ss, but cant tell for sure. 1.0 to 4.0 Chertified sandstone liqueur, gray, very hard, some layers shot with tubules. 17.0+ (a) Shale, liquidic, with interbeds of lignite and brownish-white weathering siltstone with plant frags (b) Sandstone, massive, fine to coarse-grud and conglomeratic, X-bedded, weather graywhite with red stain. Channel 45' The ss is in irreg. channel-like bodies which locally - as at crest of anticline - occupy this entire interval. Elsewhere it is all carb shales + silts from chert down to unit below. Lzt 17' below cht in ly shtsilt. 44

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1-40+ conglomerate and cqlte ss, chiefly former of granule size, down, gray and black chert. Weathers dark rusty brown, locally red stain. Is in well defined channel which thins out laterally into brown + dark gray liq. shale.. 510-? Shale, brown, salty lignitic + other clark weathering beds in slope to greenish gray Morrison like claystones Where channel cqlt., absent it is about 50't from chert bed into Morrison-like elstu with apparent gradation. Morrison has upper greenish gray part - then yellowish sandy, then lower half banded red and gray.

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Cloverly Area #3 West of Cloverly, bedlands between road & Thermop-Mowry scarp. Starting in lower Rusty and measuring down. 0.2 Ironstone, scattered purplish brown to blue-black cones. 1.2' Shale, gray, silty 1.1 Siltstone, locally some shaly interbeds, Fe-stained 0.2-0.5 Ironstone, as above, locally it is a continuous layer 1.7 Siltstone, clayey to shelly grey, massive, with some yellowbrown-weathering platy interbeds. Locally a sandy siltst up to 2' in here. 0.5 Siltstone, gray, calc flecks, weathered yellow brown 1.4' Siltstone, shaly, becoming silty shale downward, gray to dk grey 1.0 Shale, black, papery, finely silty top

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0 - 0.5 Ironstone, local scattered conc. cap of purplish redstone on underlying sand. Discontinuous 3.0 + Sandstone, very fine-grained to silty, locally varzible, some pieces z sandy silt. Commonly forms a thin ledge but locally frizble. Grades to unit below. 2.9 Siltstone, semihard, gray, blocky to poorly shaly on weather surface. Has some finely scattered, red mottler some yellow stern 6? 5.2 Claystone, very soft plastic to semi- plastic. Light gray to gray with orange-brown to red brown staining in splotches and powdery yellow vacuole-like stern. Spherulitic at very top and intermittently thrust. Sample #1 of uppermost 1 foot. 1.5 Claystone, continuous with above but dark gray, less plastic, finely silty, becoming lighter gray more silty downward.

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1.1 Clayslony, silty, ten, olivegray to brn. continvous with above. Highly spherulitic zone 7.0-? Claystone Silty, to clayey Siltsone at base. Chiefly gray with red + purple red variation. This is top red fluted unit. As elsewhere has odd division of red splotches as follows {spherulitic zone 2.8 { Greenish gray clst. with bright brick to vermilion splotches. 2.0} { Gray silty clstu - few if any splotches some brown remainder} Silty clstn + cly sltstn, gray to greenish, purplor red mottling+ brownish verilet-like fa stein. Beneath this about 2uother & feet is silty, light gray weathering bend then steep cliff fluted variegated stuff resting at base on the ten sudy clstn. ("lithic wzche"). At a few places thin ply ss layers come in about halfway in redbunded-fluted clstus. Laterally some very local massive channel sands in like that in 48

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Cloverly #1. One such is about 200 yards NW of dem in bzilznd scarp Rough meas, on slump block. - at contact 5.6t - Spherulitic zone 22t clzystone + silty clstn siltst interval, chiefly gray with purplet red splotch, weth light, yellow Fe veinslots in clstn, loc. silty zones. 6.15 Greeny clstn mottled red, grading to sh below. Weths brick red slope 8.0t Black fissile sh becoming gray at the 55 Remasurement at thickest ssnd channel. Measuring up from top of channel ss Sendstone 5.0 Shzle, black fissile, becoming silty in lower half + grading into gray weth. Plenty silt at base. Upper part grades to gray clzystone continuous with next unit. Laterally as ss thins this thickens & contains light gray 49

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SKETCH OF CHANNEL IN LOVELL MEMBER 50 Fe Stone zone concent, spherulite contact tilts to black red 10n clayey SS. Lovell Memb Little Steep Mudstone SS brick red to whitish red zone grey wash pinkish to purplish grey wash zone light blue grey band upper light red wash zone like grey

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clays with plant remains (Simplo-Lovell Channel plants Cloverly #3), thin lignitos) silty liq. sh and thin hqi sandy beds. 11,0 Claystone, mottled light & darker grey, minor greenish grey, mottled with red. Red mottling increases downward from spotty zone which of purplish red Fe splotches & concentrations which make a sharp top contact with grayer unit overlying. This unit weathers bright red & light brick-red. 6,0 Claystone, gray, tough, locally some silt but generally hard semiplastic, slicked clay with brownish yellow & tan Fe stained irreg. "vaculae" and some light purplish splotches. Weath light purplish to pinkish-gray white - vertical fluted. 4,5 Claystone, dark gray becoming silty in lower 1/2 & lighter gray, 51

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tough, semiplastic, finely silty, slicked, minor brownish stains in lower part. Weathers to light grey band. 16.5 Claystone, grey mottled with purplish red, finely silty. Soft at top becoming tougher & semiplastic downward. Grades to units above and below. Most red + purple variation is in upper 3or4 ft. where clay has greenish cast 0.5 Claystone, olive to deep reddish grey weathers to yellow + red, has some greenish grey zones. Zone of concentrated spherulite. 7.14 Claystone, chiefly dark grey in lower 2.0, becoming lighter grey above. Soft, plastic, with local Fe red+yellow splotches from weathered spherulite accumulations. Top in sharp contact with carbonaceous sandy siltstone - about 3' of it to sandy ledge but grades with SS & IBwith it. 52

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Add to this the SS channel at b250 6.0+ Sandstone, fine-grained massive v-lzr, top is platy + grades to overlying silt Maybe some fig. silts at b250 laterally 4.0+ Sandstone, zoq/llzcovs light green, at top grading to claysone purple mottled with red brown + sandy. 22.0+ Sandstone, clayey, minor sandy clasta, purple to reddish purple, weathers maroon to dark red Tan clayey SS (Moberly's "lithic wacke") 53

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Tensleep sections Lower part of Morrison red-banded, then local channel ss up to 15'±, then upper greenish gray part, locally with ss channels. section starts in upper part of greenish gray. Section A Morrison fm (in part.) measuring up 10.0-? Claystone, greenish-gray, silty, tough, weatheres to light greenish gray fine popcorn. Grades to overlying unit within about 4.0± 8.0± Claystone, gray to dark gray semihard with some silt, much slickened locally. At top is a silty zone -clacey siltst about 1' thick, weatheres light gray locally brownish 14.0 claystone, locally shaly, chiefly plastic, black, carbonaceous silty in about upper 2'. Forms 54

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"a popcorn crust. Varies from black to brownish black with much plant frags. 0 - 2.0+ Sandstone, local lousgs, very fine grained, grades locally to siltst. Forms small channels beneath overlying platy beds. White weathers buff, O.B or greyish white. 16.0+ Shale, black, interbedded to interlam- inated with shaly, cork, siltstone and lignitic brown shale. Lower 5.0 chiefly platy dk gray siltst, weath shaly bluish gray. Some black clsty layers locally but chiefly a shaly. grades thru grey green color change to unit about 2.8 Shale, silty, gray + green gray, grading to a blocky clayey siltst upward 10,0+ Siltstone, clayey, hard messily mottled grey and tan. Weathers to tan to O.B outcrop. has few thin beds resistant 55

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massive yellow woth siltstone Upper Z' becomes czerbuzzone with cozy streaks and is locally somewhat shiny. 20,0 Sndstone, med-grained, suggy forable, weathers to hoodoo dedges - light gray to white; massive, x-1cm. locally with gravules + small pebbles in lower part. 0?-0.8 Conglomerate, large angular blocks gray chert, some rounded chert of same type, also subrounded SS. May be local? 8,3 Sndstone, med-coarse becoming calcic upward, bszl 1,0 fairly hard massive x-12m; above this friable clayey poorly sorted caltc sand, white with about 0,6 Fc yellow to rusty stein at top. Has < cht (gray) pebbles, subrounded some, + many grains + gravules of various shades gray chiefly. No gooneys seen in it though, in float on bench at top. 56

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10.0+ Partially wash covered, lower 3' is "lithic wacke" - a sandy calte. clystone melted red, purple & greenish gray. Grains may be from this 3' zone. Becomes more clzyer upward, mottled purple+gray to top-silty. 2.0+ Clzystone, hard, green, silty. 3.5 Clzystone gray, hard + sandy at base with large rounded qtz grains, becomes greenish gray lesssandy upward & in upper half veriegated with purple 4.0 hard Clzystone, silty to sandy as below, purple gray to bluish gray. 1.3 Clzystone, soft, olive, probably bentonitic flecks of orangored. 1.5 clzystone, soft, greenish gray, irregularly interbedded with med-course layers sand made up predom of chert grains. Locally a mixed clayey ss. Sand dominates-should precede 57

5.6 5 280 5,6 2.8 8.4

7.5 Claystone, gray, scattered silt and sand grains of qtz + ch, minor red flecks + pink stained areas. Chiefly a soft clstu. 0.6 +/- Siltstone, hard, irregularly laminated, seams gypsum. Forms local small ledges. 2.8 Siltstone, massive gray, yellow powdery stain in lower part weathers gray white. Becomes clayey at top and grades to unit above 5) 8.5 Claystone, gray, waxy, becoming light gray, prob bentonitic in lower 2.0. Has some suzcs with what appear to be sparsely spread spherulites. Has hard dark gray silty zones.. Unit spot-exposed only 4) 25.0 Interbedded platy siltstone, shale and silts shale. Black to gray + brown locally limnicitic. Lower 20' chiefly sHstsn, upper black silty sh + some cl.shale tdStn. Chiefly massive loc friable brn silt in basal 1/3. The 58 Not well exposed

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clwm fossit (Sample 1) comes from the lower 4 feet of the unit. Plant fragments throughout. 3) 6.0 Sandstone, fine grained, upper 3 to 4' massive, hard, ledge forming, lower part becoming silty, interlaminated with grey silt, less resistant. 2) 7.10 Shale, dark-grey to black fissile weathers grey some brownish green. Finely silty with some thin interbeds and laminae of silt. 1) 0.3-1.0 Chiefly ironstone, locally interbedded Fe rumpo siltite, & ironstone, docs capped by cone-in-cone. Note: In the section the "upper contact" is probably out between SS of unit 3 and underlying beds of unit 4, or it is within poorly exposed unit 4

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Tensleep B. Burl section across contact zone. Measuring down from base of SS of unit 3 of preceding section, which is here considerably more silty, platy + forms weak shelving ledge. 2.0+ Shale, black liquidic, grades to silty above, tough, finely silty with many plant frags at base. Grades upward into siltys ~? 3.3 Claystone, silty light grey with rootlets grading within about 0.4 to a light grey clayey siltstone - loc. Silty clay, massive with few stained areas + red splatches. 3.0 Siltstone and very fine-grained sandstone, irreg. bedded somewhat rugilaceous, with lt. ltrey silt + clayey silt loc. contorted laminae. Grades in lower part to dk grey clayey silt. Plant frags loc. abundant. 60

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4.0 Shale, blch to brown, hq fissile in upper iot, grading to gray silty sh + siltst. 7.4 Sndslony fine-grained, massive beds up to 2.5 ft thick with ptqs and beds silty siltstn. 9.2 Siltstone, dk gray to brownish with some ptqs + interbeds silty shale. Chiefly massive to soft-platy with numerous plant frags ~? 1.0 to ? Clzystone, soft gray waxy 61

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Muddy Crooks section Gully bottom - measuring up 25'- wash on platy calc siltstr, liquid mudly silt siltstr, bszl 5.0 to 7.0 is black carb shale. Within about 10' below this it grades into green Morrison as at Tensleep. Morrison well exposed, is bended red + gray throughout. 10.0 + Sandstone, fine-quartzed massive, x-lam, white, washes light gray somewhat friable. 17.0 + Obscured spot trenches show 10c. soft very fines silt in lower 8', Above is siltstr, gray, becoming clayey at top 10.0 Shale, black to brownish, fissile, finely silty, plant frags in lower 3-4 ft, above this is dk gray plastic than in upper 3' becomes lighter gray silty sh. 62

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1.5 Sandstone, fine-grained, sparkly, weather to crumbly buff to brown lodge. 3.8 Siltstone, light gray clayey with orange splotches ferromous stain. Darker gray at top appears to grade to unit above. Locally spherulite. ~2?~ 3.13 Shaley chystone, tough, graded gray + black with plant rootlet like impressions in lower 0.4, above plant frogs plentiful, loci carbonized, thin plugs lignite, grades into fissile black shale in upper foot. Powdery yellow stain on lig. part. 3.5 Siltstone, gray at base to greenish gray above, weathers sharply, is clayey in lower part. Local orange + O-Red stain from Fe- these locally spherulitic. 0.1 to 0.2 such zone at top is heavily spherulitic.

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0.2t Siltstone, and loc pockets fine- grained sandstone.. Platy, commonly Fe impreg brown 13.0 Shelly, black, fissile, to brownish gray finely silty, with scattered thin beds and lenses of siltstone. Single large ironstone cone, 6 ft from base 1.0 Siltstone, platy, Fe impreg, forms z loczl czp. Above this were interbedded black sh + platy siltst. with scattered Fe stone cones,

Peycco area West Middle Fork Pawdow River #1, SW cor, sec. 30, T.43N, R.83W., NE dipping ss ledge N of rd. First section roughly 400 ft N rd where top of SS obviously rises in section. Slope wash. 4) 30.0 Sandstone, massive, fine to coarse- grained, x-lzm, loc. friable, pitted streaked pinkish brown to red, loc. mostly a gray-white. Numerous chips bleached clstu up to grenule size in lower 10.0 ft. 3) 2.5 Sandstone, very fine-grained, grading upward to siltstone. Locally no clearcut contact with underlying massive SS, but laterally thin sandy clay silty clay comes in between the two. Weathers gray white, yellowish to orange steln. 1- 2) 8.0+ Silt, black-, fissile, some thin interbeds + lzmtnz of silt, silt layers "worm" casts & trails, weather olive gray 1) 0.5+ Fe impreg., siltst. with "worm" markings. 65

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West Middle Fork Powder River #2 About 200 ft. S. of #1 Measuring up from top sandstone unit 4 of preceding section 8,5 Claystone, silty to sandy, light gray, grading to clayey hard very fine ground ss to siltstone at base 1.5 to 2.0. At top becomes sandy with local lenses fine SS up to 1.0 which includes large polished pebbles. Whoa SS absent pol, pb. float from clstn Zt contact - seems to be concentration of same Zt this contact. The base 1.5 to 2.0 feet of sandy stnt clay SS here can be walked out into unit 3 of preceding section Top of this 8.5 unit loc siltstn in upper 0.2 with spherulite. 5,5+ Shale, black, fissile, with thin intebeds olive gray siltsf + also laminacc, "worm" marked. Above becomes down. Olive wash of plan" 'Wormy' silt. 66

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West Middle Fork Powder River #3 About 100 ft S of #2. Measuring up from top of sands into unit 4, to section in 3.01 Sandstone, silty & clayey, grading upward to silty claystone, light gray, chiefly friable (= unit 3 sect. 1) 7.0 Claystone, gray at base, silty, becoming lighter gray mottled with red above, some Fe yellow stain. Upper 1.0 is sandy, yellow stained silt, coarse grained (1 foot±) 1.6 Sandstone, chiefly fine-grained with silt. coarse grains, granules clt qts. Gray white, weathes O-B + buff, irreg, with Brown to blacker weather. second. calc. zones. Becomes clayey (latterly + friable, has locally large sperulite pecks up to 1mm diam. 3.8 Sandstone, fine-med gr, silty loc. @ sandy siltst, light gray. with 67

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local leases fairly resistant yellow-brown weath ss. loc same black stain. its very spherulitic upper 0.3. 11.5 Shzle, black, with lzmwro + thin interbeds platy "worm" traced silt which weath olive. Latter increase in upper half. Local Ironstone conc. flat lens in upper 0.5t. Offset on this section to ledge at road where measurement down from top of sandstone (unit 4 of section I) - about 100 ft + S from preceding. 26.0 Sandstone, fine- to med-grained, with massive xlzm with scattered lzyers cley pellets + coarse to cultic - chert grains + granules, bzszl 1.0 to 6.0 weaths, loc., O-B, rest of ledge chiefly grey-white. 13.0+ Clystone, black, upper 4 compact, clean, below this zone finely silky soft + slicksided with Fe stain on slick surfaces, more compact qyzin bzszl 5.0t. 68

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1.2 Claystone, olive gray to gray waxy, prob. bentonitic 7.5 Claystone, dark gray, semi hard. Grades laterally in lower 5.5 to light green[gray] hard silty claystone with thin irreg white stringy flake 0.3 Bentonite. 0.4 to ? Claystone, black Slopewash Approx. 15' strat below bentonite in thin ledge typical Morrison gray sphentic limestone. 69

Notes on Cloverly along Middle Fork Powder River East of preceding sections. Some relationship holds at Rusty-Cloverly contact; i.e. in local low areas on top of the "sparkly" SS, claysstone beds come into the section between contact & the SS. Laterally the Rusty beds rest directly on the SS, or very close to it, and there is a log conglomerate layer of polished pebbles. Because of apparent lack of continuous key layers the relation of Rusty bed detailed stratig. to the "highs" on the sparkly SS were not determined. At Loc. reached by taking first right from end of pavement on Bernum road, going about miles and walking W & NW along top of "sparkly SS" ridge into sec. 33 T 43 N R 83 W - Rusty beds chiefly on or very close to "sparkly" with amazing local accumulations of polished pebbles - either loose in silty cstm beneath contact or incorp in top layer of Fe impreg. SS at contact. Locally a typical Rusty bed ironstone sits directly on contact - though elsewhere the first of these Fe-stones 70

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do not appear lower than about 10' above contact. This could indicate overlapping by Rusty but not enough is known locally about Fe-stone distribution to substantiate it. Sparkly is about 30'+ most places but thins locally. Also has basal 2 to 5 feet of cut granule cgl not unlike the "Pryor" type cgl of the Thermopolis region. Beneath Sparkly the usual gradation from black clstn into greenish clstn then more brightly colored, calcareous Morrison - with no visible block. Locally a fine-grained ss channel body comes in about 15 feet beneath the sparkly. Includes dk gray & brownish shely ss & silty sh interbeds in lower part, weathe buff & brown and is locally as much as 15+ feet thick. Hard green silky clstn layer between it and Sparkly locally - may = green ledge in preceding section. ~ at least is about in same position. The Cloverly-Rustybed contact is very sharp & clear-cut throughout the Middle Fork valley area, with black shales and siltstones resting either directly 71

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on sandstone with trg cql. - or on clayey ss, siltst, & claystone of light gray to whitish color with Fe concent. and fairly persistent accumulations of spherulite molds. Morrison contact - Nowhere in Maycworth- Middle Fork once is there a clearest break. The Sparkly overlies lignitic, kentonic, gray-black claystone which grades to greenish gray thence to green and purple without obvious break. In proceeding section limestone first occurs only about 37' beneath base of Sparkly - elsewhere in Middle Fork once highest calc. beds more than 80' beneath in purplish cltn. Apparently no consistent level calc beds to appear. Nor is the thickness of black or dark gray claystone beneath Sparkly consistent - though this criterion seems more useful map limit if one has to be drawn. 72

1 leaf - 6503 used for.

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