Field Notebook: SD, WY 1961
Page 31
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
SECTION #2 (Loc. 74) NW¼, NW¼, SW¼, sec. 33, on SW side of liginitic-shale-capped spur trending SE from Hell Cr. bluff in cent., E edge sec. 32. Starting at top of the sandy zone with scattered white conc. ss masses (unit 7 of section #1. This is a very persistent unit in the local bedlands and about the best datum for control of rapid lateral changes in "Colgate" and Hell Creek above. Local fossil accumulation at top = sample 1. (6011 74*3) (1) 15.3 Interbed. silty shale, silt and sand. lower 2 to 3 ft more shale and with this gray popcorn bench over underlying sandy unit. Above this it is rather veg., thin bedded with silt and sh. pred. over sand. Whole markedly bedded (2) 10.0 Sand, with very beds shaly sand with cub frags, with this to crumbly or popcorn slope. Much of sand is slightly clayey, a "Colgate" type = subgraywacka, mostly vfq. (3) 16.6 Sand, friable, gray vfq+fq, with shaly carbonaceous interbeds, some lignitic lamine. Blobs jvosite and limonitic weather zones that weather to thin OB chips. Some local indurated x lem. lenses - some with plant frags. Unit weather to lite gray weakly fluted slope. Some layers Corbicula assoc with Fe layers or in sand near them. Also numerous Odd button-like cones. Some otoliths too-