Field Notebook: WY, SD 1956
Page 91
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
Gully draining old quarry on N side Fall River directly across from Evans Quarry. Base of Evans Quarry SS - (sharp contact) 6 2.0 hard, Siltstone, sandy, loc. platy with bru + purple stain, plat frags and some clayey inclusions forms brown worth ledge grades to into fine ss 5 1.8 Siltstone, clr grsy, massive, hard subconch fracture, grades down (+ lzt.) to unit below 4 5.4 Siltstone, czub, sandy, massive fractures in big sub conch blocks is irrvg. lzm. with fine SS, + has plat frags. 3 5.6 Claystone, silty, shely black, with irrvg interbeds clr grsy clayey silt. Becomes silty at top grading to unit above. At base becomes sandy 2 24.4 Sedstone, fine to coarse grained, with conglomeratic beds, Massive, cross- bedded. Thin bed sndy silst 6.0 from top creaths white, SS wreaths reddish 44