Field notes, undated (7)

U. S. GEOLOGICAL SURVEY TRAVERSE BOOK 9-904

Thompson's Island Savon Hill Dorchester Bay Harrison Square Commercial Point Squantum QUINCY BAY North Quincy Atlantic Station Wollaston Heights Quincy Center lton Creek East Milton Moo 1 2 HaIl 3 QU 4 Quincy 5 South Quincy 6 Smithsonian Institution Geol National Museum RR RR

"National Museum" Rainsford Id. h Id. Quarantine Rocks Windmill Pt. Hull Sunken Ledge Peddock's Id. Harry's Rocks Prince's Head Hangman's Id. 2 3ompkin Isl. Sheep Id. Nut Id. Grape Id. Slate Id. 3 Moon Id. Hough's Neck Raccoon Id. Do Lan 4 Rock Id. Cove Weymouth Fore River H en River Bay Weymouth Back Rive 9.12 Great Hill Hunting Hill Squirrel Point Hill North Weymouth Old Spain Hingham Quincy Neck Fine Pt. Heals Cove Old Boat Pt. Fort Hill White Neck King Oak Wymans Hill West Hingham Braintree Weymouth Landing Weymouth 6

L W E S R Beacon Pt. Allerton Little Hog Id. Nantasket Strawberry Hill Beach Bumkin Id. World's End 3 Little Black 4 Crown nding Crow Pt. Chandler's Id. Sailor's Id. Ragged Id. HINGHAM HARBOR NGHAM Nantasket COHAS Hingham Harbor Old Colony House Station SOUTH SHORE BRANCH OF TH m Hingham Cen Lower Plain Turkey Hill Stituate Hill 174 Wair River Triphammer Pond OHAN

" Black Rock Rock SETT Little Harbor White Head Cohasset Harbor Cohasset Cove Gulfold Scituate Neck The Glades Oshar Rocks Smiths Rocks Barr Rock Musquashiat Pond Hoop Pole Hill Mann Hill North Scituate Garnetts Corner Bound Brook Rd y ond

R. [illegible] /19/3/n [illegible] [illegible] 5 white [illegible] 3/4 white long leaf 20 1/2 ft. [illegible] 7 1/2 lb / [illegible] + faling of thistles increasing to 5 ft eastward N 70 E = COE 45 N 1. [illegible] W. Millett, Bradford, A little My line between Prospect. Henslm.

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641 Farthest or rather exposure is a dyke, of diabase I think running N85W and cutting across the slates whose strike is N70-75E, dips nearly vertical or faintly towards N. The real strike can be detected by the fine banding confered if changes I call or by fine scale and clears. East of this dyke and first part of the same I think stratify vertically are bands of quarts following the true strike of the slates. This would seem as though they might be met- tamorphic sand sedimentary beds but they seem to break across the slate layers a bit, the turns which they can come up and al- though they be in a decided by sedimentary ap- pearance I am conclud, they were veins. The cleavage has a direction here in the slate d N75 dip vertical, and stops abruptly at the 'candet ore'. In the sandstone are clefts running N60W. In one or two layers of shale intercalated the cleavage is the same as the general cleavage with air. This leads me to believe that the cleavage of the shales was made after the intrusion of the quartz veins, and per- haps at the same time or after the dyke between. At the north side of the road the strike is E+W, and the dip is 75N. The cleavage is N65W and is disp vertical. On the south side of the road is a dyke like '9' or a candet ore, probably the first since it resembles '1' which looks more like a dyke than candet ore. At the southern end of the ex- plosure is what I think is another dike. It looks like a candet ore but breaks as as the slates in- regularly like a dyke. This would make at least 8 dykes in this locality, all of the same kind. The strike and cleavage here seem to agree N65W. dip 80-70N. The dike once a cross the strike from the south endthen to the count northen exposure is 112 steps = 225 feet? The slate of the entire series is finely banding, greenish, or dark bluish green sometimes very albitly. People not resembling the red series however at all. 641 The ridge of 41 -- of 42. Runs N65W. This would make the ridge pass to the south of Racoon se- land. It is composed entirely of dykes veins. These were formed by or near the close.

of 4 ! The ridge of 4.1 - of 4.2. Nino N 65 W. This would make the ridge pass to the south of Racoons Is. land. It is composed entirely of dyke rocks. There were several flows here. Along the northern margin at 4.1. and thence a- lng the northern edge occurs a greenish rutila dense, and leucogenetic rock, which near 4.1 shows perplegotic feldspar crystals and nearer of 4.2. looks like an indurated slate, but I satisfied myself at least that it was not a slate but only the same perplagitic rock with no perplagitic crystals. Along of 4.2. the centre and southern side of this border is a rime purplish rock, among dacoidal often densely filled with small dark streaks, which I suppose are chloritic amygdules. ofen filled with larger, often 1/4 in diameter, amygdulites, which consist chiefly of quartz or first chlorite with an outside of quartz, or lime crust, or chlorite or serp- tinite? the last two in smaller amygdulae. No sedimentary rocks, either slate or Everglan erate were seen here by me At the eastern end of this part of the rock, Rock Island Head I saw no conglomerates or slates although I notice only for some reason other marks in con glomerates. I was then anewere at low tide. 4 43 Coarse reddish conglomerate rims as a ridge to of 4.4 which ridge has no slate, or sandstone to a- ny great arm unit. Almost entirely conglomer- ate, of variable coarseness N 65 W to N 75 W. The cleavage seams dip southward. I am not certain that the strike is south ward although I presume it is about 70 S. The rocks at least dip at a high angle, since the stratifi- cation often climb not they plainly in the conglomerate, which I think would not be the case in more horizontal strata. Along the southern side, a little east of the centre of this ridge is the greenish diabase which jects into the con glomerate in tongue. This ridge lies south of the diabase rise 1-2, at least 50 feet.

Q.4.5 This is intended to locate another ridge, passing south of the last, and is composed entirely of the greenish or bluish-green diabase, only. At least I found no conglomerate during my short search here. All these two ridges are separated from each other by low nearly depressions having a direc- tion of N 38 W. Q.4.6 is not separated with the same distinct- ess from Q.4.5 indeed I doubt whether any facts can remain here to be brought out. If thus or any its directions & N 70 W. which is also the direction of that ridge of Q.4.5. became a fault depression lies in line with the northern edge of the diabase ridge, towards the south of which the conglomerate exposure of Q.4.6 are found. No diabase was visited. here. Q.4.1 Just at the landing northeast of the house. Black ish grey slate, same as at G.7.1 and Walleston Hight. Strike N 80 W. dip 70 N. to 85 N. The slate is banded towards the south. more near- sive farther inland. Then banded again. Just east of it came 20 feet is some of the rock I called massive slate, which looks like argillite. On both sides of this sheet at catified slates are much contorted and there are included contorted slates. It would be called a dyke here I think. but it will look and break like argillite. What is the meaning of the included contorted pieces. Q.4.2 Strike banded slate along shore. fine exposure. N 85 W. Dip 80 N. Warren's argillite farther is land. Q.4.3 Strike of banded rock fine long exposure. N 80 W. dip 70 N. - 80 N. Q.4.4 The slate extends out into the sea in ledges un- der the water for 100 feet at least, keeping up its strike. This is the place to go to see contorted strata still preserving their general strike with great accuracy. Dip northward 80-75. N 80 W. The contortion of the included banded slates in the more massive argillite, in very estimation one are nothing. Q.4.5 There seems to be a dike here along, the strike of the slate similar to the others at G.7.1. Q.4.6 Strike N. 80 W. Q.4.7 Strike N. 85 W. Dip 80 N. Dike there. The same

45 There seems to be a dike here along, the strike of the slate similar to the others at F 4 1. 46 Strike N. 82 W. 47 Strike N. 85 W. Dip 80 N. Dike Here. The same banded slaty rock. 48 Di[illegible] south of the lens. 49 Dark greenish slate N 80 W= clearance? Dip 70 N. Whether clearance or strike I could not tell. Presum- ably the same as the banded slates nearby. X 54 Granite. X 51 Amygdaloid diabase runs among conglomerate N 63 W 45° N, so even as the strike & dip of red conglomerate can be guessed, down there. X 52. Sledgeham smith bold, E + W about, conglomerate band in the middle N 73 W. 45° N. diabase north of the conglomerate Y 51 A decidedly ferny slaty slate, N 50 E., where from E stranded, 80°- 70° W. The rest of the experience the greater part, is amygdaloid. Y 52 Red conglomerate same as X. 5 1 and 2. A large amount of igneous rocks here included as pebbles & boulders often of large size. The diabase still penetrates the same in larger and dykes although not as frequent or so largely, as at the more eastern localities. Due to a depression between the last con- glomerates and those slates and the strike seems to be different, but it must be re- membered that the strike of the coarse conglomerate can be only indifferently determined. Y 53 Slate Cambrian N 50 E Dip 70 E Y 51 Cambrian slate N 15 W. Dip 85 S, G 6 1 Slate fine E + W. 85 N. Greenish purplish. G 6 2 Slate fine N 75 E 85 N. + vertical Side purplish G 6 5 E + W. Dip 80 N. Purplish G 5 1 Red Cambrian, fissile, N 57 W. (70 S?) G 5 4 Conglomerate, whitish. Not much amygdaloid on another road further north. Injurious.

10 85 E 95 W. 40 W. 95 65 E N 50 E 55 E S 45 S 67 W 33 S 61 N 12 S 22 E 22 W 28 N 59 W 86 S E 38 N 59 W 86 S E 38 S 45 N 50 E 55 E 65 E S 45 S 67 W 33 S 61 N 12 S 22 E 22 W 28 N 59 W 86 S E 38 N 59 W 86 S E 38 S 45 N 50 E 55 E 65 E

N70E N65W N35E N35E N15E N80N N45W N70W N75W N46B N70W2 N5IE N75W1 N45W1 38E N50E N5HE N7SW N48E N48E N48E N48E N48E 4.00 3.64 7.64 6. 7.84 1.25 5.79 3.00 2.79 1.25 1.54 5.79 2.00 3.79 2.25 1.54 11

J. 3. 1 Banded grey slate like that of Racoorn Island, N84 E dip 80 S. Most prominent cleavage N65W, dip 72S. About 115 steps across the strike of slate, all parallel; J 3 2 Thinly cleared slate of dark purplish grey coln, in some respects like the slate in the R.R. cut at Waymouth. N84 E dip 80 S. This cleaved slate was apparently banded at one time; a little further north it is readily seen that the slate was banded, cut by a dyke N 45 west, width 3 feet. Thirty seven steps across the strike to bare exposure at top side, two dykes in the plane of the slate, 15' in clus, widths; evidently a faulted single dyke, A third dyke not in line north the next but also following its strike belongs to a different appa- rent. The exposure is a long one. K 3 1 The dark colored banded slate of J,3,2. N 82 E, dip vertical, many dykes intrusions parallel to bed, ding dip vertical a 85 S. Further east for a long stretch the strike is N 70E dip 85 S. The banded structure is also well exhibit ed still further E, strike N 63 E ?5S, K 3 2 Strike N 76 E dip 85 S. K 3 3 Strike N 85 E dip 85 S. K 3 4 Strike N 74 E dip 85 S, K 3 5 Strike N 72 E dip 65S Numerous dykes of whorish coln, transient to, both with the strike and cutting across the course occur on this isolated slate Island. K 4 1 A ledge above water at low tide only. The Cambrian red conglomerate and sand- stone clearly a sandstone, two purple color striata into almost absent, at other times pres- ent. Strike E+W. dips southward I think. L 4 1 The red Cambrian conglomerate but with lost the red coln. Strike E+W. dip, 45 S. At this particular locality bands of sandstone intervene in the conglomerate, especially towards the bottom. An E+W where dyke cuts across the strike dipping 45o to the North. L 4 2 Red Cambrian conglomerate with landstone intercalated. Strike E+W. dip 45 S. Sandstone bands present, alt.

L42 Red Cambrian conglomerate with Landstine intercalated. Strike E+W dip 45 S. Sandstone layer sometime 3 ft thick. Conglomerate in this end and quite as coarse as at Chandler Island. The conglomerate contain granito, felsite and micashyge pebbles, also banded slate pebbles Just north of two room home on the island a large boulder, 2 ft long and 1 ft broad is included in the Chief breast. This pebble is composed of greenish banded slate, similar to those found at Raco Island for instance. A tremendous purpleish rock which might represent the simple Cambrian is also included. Massive greenish sandstone 15 feet thick from a large layer on N.W. end of the island. On looking about I found several additional pebbles of the banded slate farther east. L44 Granite in abundance in place. L43 Red Cambrian conglomerate N.S.E.W. dip 45 S. Sandstone, usually greenish in all three conglomerates, intercalated. Fine grained sandstone was intercalated at L41. A fine purple sandstone occurrence at L43 sometime intercolated for short distance with the coarser green variety. These purplish bands are especially common along the northern side of the island but as always thin. The massive green sandstone is very common here especially on very thick found on the north side of the island.

J31 At the next northern junction of conglomerate then red slate, 3 feet. N 80 E., strike south. Then coarse conglomerate, towards the south an conglomerate shielded by a slaty cement, and next a fine real slate comes in with its strike N 65 E. dips 25 S. other slate is banded. South and west of this the rock is all melaphyre itself split by large diabase dykes. J42 Conglomerate rather coarse in the depression in a valley between the conglomerate region and the melaphyre hill on the east. J43 Coarse conglomerate with melaphyre pebbles and felsite, red. J44 Coarse conglomerate. Reddish in general with felsite, melaphyre, etc. J45 Much granite. J46 Granite. J47 Granite on the west and coarse conglomerate on the east. There is a contact here but with the short time spent here I think the evidence was considerably in favor of the conglomerate not deriving pebbles from the granite. But sections are needed to establish this. J48 Coarse conglomerate. J49 Coarse conglomerate. J50 Coarse conglomerate J51 Coarse conglomerate J52 Coarse conglomerate with coarse granite and melaphyre pebbles and a melaphyre as a dyke in faulted on the north side. J31 This whole desert is melaphyre - amygdaloid. J41 On this promontory is coarse conglomerate, one coarse granite boulder is 3 ft. X 2 1/2 diameters. The melaphyres and felsites are all well represented. A melaphyre dyke is on the south west end. The first satisfactory signs of stratification were found low. The strike is 54 W. and the dips 75 S. Over this exposure it seems by large enough to determine the dip for the whole region but on another edge of the promontory is another melaphyre dyke. J422 Granite, coarse in abundance. J423 Greenish melaphyre.

R 4 22 Granitc, rare, in abundance. R 4 23 Greenish melaphyre. R 4 13 On coarse conglomerate included in the granite, several boulders and a large erratic stoup of the same conglomerate. R 4 14 Granite coarse. R 4 1 Coarse Granite R 4 2 Coarse Granite R 4 3 Coarse Granite. R 4 15 On the west coarse conglomerate, slaty and sandy layers of very limited extent, strike N 60 E. dip 15 S. On the east is the massive gneiss-gabbro. S 3 2 Gneiss-gabbro. S 3 3 Conglomerate - Strike of included granite, 1 inch length, N 65 E dip 15 S. On is the coarse conglomerate with granite, gneiss-gabbro and feldspar pebbles. Granite pebbles are more usually numerous yes here. S 3 4 Thin veins small layers of inter bedded ore sometimes. Strike N 60 E dip 35 S. P 4 1 Gneissoid looking granite. P 2 1 Only loose boulders. P 4 2 Gneissoid granite. P 4 3 Gneissoid granite etc R 4 1 Gneissoid granite. This granite is dif- frent from the Granodiorite variety and al- though the gneissoid structure is not always marked, variations to diorite types of the same locally prominent. R 4 2 Gneissoid granite R 4 3 Gneissoid granite R 4 4 Gneissoid Granite R 4 5 Gneissoid granite. S 4 5 Gneissoid granite P 4 4 Gneissoid granite. S 4 6 Gneissoid granite. S 4 7 Granite S 4 8 Granite R 4 16 Granite R 4 17 Granite R 4 18 Granite.

J 4 9 Sarnite 0 4 10 Amygialoid. 5 4 11 Conglomerate. R 4 2 Near the water, diorite. Next slate, rounded, strike N 60 E dip NW but struck & flexed. Next_ much amygialoid at summit. R 4 3 Slates N 70 W. Same as R 4. 2. Dark, slightly graphitic but apparently nearer the slates of Slate Island or dip in general north. In places much contorted. 32 steps across the strike. Nine for 200 steps south is slate cliff S. then comes diorite. Turn for 100 steps south about comes slate dip east & contorted. Then several rounded slips of amygialoid with either fractured amygialoid or con glomerate at two small places. R 4 4 Slate. N 60 E. dip, north. soon after opposite_ the strike in cross somewhere near N + S. R 4 5. Slate. Rounded. The same since R 4. 2. Strike changeable, much contortion. In general E+W. but also much nearer N + S. strikes. R 4 6 Slate with conglomerate composed of slate pebbles forming lumps (ft thick ~ ? R 4 7 Abundant Conglomerate passing into slate on the east. No amygialoid pebbles E. & W, cut through cut S. the valley. N 40 E dip 45 N. R 4 8 Dark slate with graphitic tinge, as at R 4. 3 near above. Much of the slate since then has been greenish. 16 S 4 1 Conglomerate, whitish, down to the creek, nearer or else across no melaphyous pebbles found, per

54/1 Conglomerate, whitish, down to the creek, names no exposure, no melaphyr, jettles found, per- haps this is only a metamorphosed form of the common conglomerate of this region but it dif- fers at least in not being a large jettled form. R 59 Amygdaloid, a good-sized exposure. R 510 Granite, plenty. R 53 275 steps east of the Squirrel Hill road junction is the purplish slate outcrop with fine laminations similar to the Malaprop arch. Strikes of slates E4N, dip about vertical. Conglomerate towards the South coming in on an E+W line by a fault? Contact is fused. Cryl, whitish matters of broken reddish tonalophy. R 55 195 steps west is more of the creek clearance, jett makes strike near N75 E. dip vertical, hidden WSEfrom Y 55 75 steps east, plenty of amygdaloid, Y 56 75 steps east, plenty of conglomerate, whitish. Weathered surfaces at least will expose. No amygdaloids recognized at least. R 57 Conglomerate, same as at Wallastin RR station, very reddish broken jettles, dark brown red. Plenty is felsic. R 58 Plenty of amygdaloid. Some conglomerate towards the South east, also some included laminated "red slate?" in the amygdaloid. R49 Red conglomerate of Donner Landing type. R410 Amygdaloid. R411 Slate, dark hack with sandy courses, strike about E+W, dip 10 Swith. Which indicate rather westerly L51 Granite L52 Very coarse granite R412 Amygdaloid. A fine grained amygdolite in con siderable abundance, with interlaced thin sheets of red Cambrian slate or moderate quartzite, E+W, dip 25 South

R 4 13 At the south end is amygdoloid. Further north (50 steps) are greenish slates, strike N 25 E dip 25 E. This greenish slate has the gemmed red tinge of the Cambrian at all any places, at some places the purplish color only marked and the strike changes to EY W, dip 65 S. Bridging this set slates to the West's one of the amyg doloid, Further north is plentiful conglomerate N 30 E dips north 20 think. Therefore cut in line with plate. R 4 14 Slate on west, red purple Cambrian N 10 E dip 20 W. Conglomerate forming long broad ridge to the east. R 4 15 On south towards middle of this hill is conglomer erate, on this slate on west showing faintly in places, at north end is rotten brownish conglom erate dips 45 swt, east of this red from Cambrian sandstone and slate, dips 45 east, strike N 8 about, the two join conformably. Further east is a large arm part of old Cambrian slate strike N 4 S, dips 45 W, across the strike 50 R 4 16 steps. Further E is 50 feet more of slate can dip. Then 15 steps of conglomerate. Then 50 feet of slate, then 50 feet of conglomerate red series, At east end is abundant conglomerate. Following the great edge of this ridge on theward I find that the slate kindred somewhat lines the east side for quite a long distance. R 5 11 & Granite,

Wormouth Back Run Beads Crk. 19

slate overlies the conglomerate, all of one general age. 20

21

29 45-2 greenish shale, strike about E+W, about 200 feet southly limestone horizon.

Lg 5 2 Greenish shale, Strike about E & W, about 20 feet south of limestone horizon. Lg 5 3 Greenish shale underlaid by limestone layer very full of Hyolithes + little shells at one place. Three steps south ward over thinner limestone layers continuing for 3 more steps southward, then greenish shale, Strike NS4E dip vert a slightly S = strike towards locality 16 on next road west; 15 steps southward the same rounded limestone modular courses come in. Lg 5 4 On west side of road north of line of strike of 5 this purple shales continue to show the scattered nodules of limestone + spudate. Lg 5 5 Along Pearl St running E & W is more purplish slate with spudate nodules,

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