Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
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Transcription
PG. 64
16 7) Limestone, medium gray, very massive locally, but in 6" to 2' beds; many fusulines, highly inflated forms; Collection 8/21/57/4 - 45' up. Total 55'.
17 8) Covered, 30', mostly limestone; a few shale parting (1"). Unit 7-8 is unconformably over lain by unit 9.
18 9) Dolostone, medium-brown, slightly orangish in fresher blacks. 120'+. This once had limestone conglomerates and a rich fauna in it.
19 10) Limestone, medium to dark gray, 15'-20' massive beds, silicified fossils; 30' to U.S.G.S. BM. 8/21/57/5.
(note at bottom of page: 1998 - I would now consider this basal Leonardian = to Lower part of Hess Limestone. Fossil includes reworked Lenox Hill age fusulinoids.)
PG. 65
Collection 8/21/57/6 - SE slope of Leonard Mt. This is float between 2 conglomerate layers. I believe this is near the top of the tervra-block of C.O.D. (This may be in place at base of lower conglomerate interval).
Section 36, about 1 mile SW of Hess Ranch following up an east-west fence.
{note: illustration:
bed 1: 9', sill
bed 2: 7/23/58/6; This is jumbled up and it seems to be flexed due to the intrusive. (Calcarenite to N.); 1-3" sandstones, deeper iron stains along joints.
bed 3: 8/21/57/8; 35'-40'; 8/21/57/7; Limestone, organic frag, yellow-weathering, gray limestone pebbles unit. Rest is shale, gray, with a 4' marl near middle.
bed 4: 8/21/57/9; 20'; black limestone, orange cement, 4" to 1' beds, interbed with shales, gray. 7/23/58/7.
bed 5: Calcarenite, 25'; dark gray with orange sand matrix.}
PG. 66
8/22/57 - (Mr. Dillinger, Forest Oil Co. visited).
8/22/57/1 - from Hess Conglomerate, near Gaptank area - Pebble is in lower unit of conglomerate series; north of the point Highway passes through #5 Gaptank Limestone.
8/22/57/2 - Barite from Morrin claim, 45-50 miles south of Marathon, Tex.
The implication of a large local high extending nearly E-W across the Montgomery Ranch just north of the Ranch House and extending into the canyon 1.5 to 2 miles WSW from Brooks Ranch House. The thinning of the clastic interval in the Wolfcamp and the gradual increasing dip of older rock on the Moore Ranch suggest this was an active high during upper Gaptank time through Wolfcamp time. It seems to have had little effect on the Hess or Post Hess sediments. The Gaptank limestone gradually changes to a sandy facies over this high.