Field Notebook: SD, WY 1961
Page 25
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
(5) 5.0 Interbedded, gray to brown weather finely silty sh. and irreg X-bedded 1x-12in vfq Subgraywacke SS. Locally SS predominates over large part bedlands, but loc. shoals out. Where study commonly layers 1 to 1.5 thick at top and base, intersecting small lenses also common. Red brn X-brn cclc. Com. cones, light gray on break zvc common. shaly beds loc. szzt, plant frags. Sample 6 is with SS + shale some shell frags in piece (6) 36.7 Shale, vf silty to bauxitic clay shale with silt blobs interbedded with & interlza. with silt & minor units of vfq sand. Unit as whole is chiefly > bedded shale + silt that weathers to rounded popcorn crusted shoulders, bedding not as prominent as in lower bedded beds. Fresh shale varies from brn gray to black, plant frags general througth local concen on bedding. Few concretions and those chiefly loczl, no continuous layers, small rb'tgray weathering, blocky fracture also some lim. & jzvos. blobs; Cones - as usual- on sandy layers. Upper 12' begins to get shalier Sample 7, 5', above base Sample 8, 15'' Sample 9, 25''