Field Notebook: CO 1951a
Page 25
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
9' so: fine grained: in massive beds: cross laminated? gray to light gray: weathers buff and iron brown: surfaces take desert var- nish: 2.8' sandstone and sandy shale: upper 1.5' fine-grained sandstone: light gray plant fragments: alternating soft friable and fairly resistant layers. Lower part consists of very sandy gray to [brown in the pink light] with numerous layers of shaly sandstone. 5' massive to very bedded fine so: plant frags scattered throught: light gray: weathers buff and iron brown: becomes progressively argill. in lower 2' and seems to grad[es] into unit below: no sharp break recognizable between so and underlying unit below. 3' -> 4' sandy gray claystone grading to argill so: hard, conchy fracturing. some thin lenses of dark gray sandy shaly clay in upper part. Basal contact of this unit with underlying so appears to be gradational. 5' so: light gray: chiefly fine grained: poorly resistant: resistant where iron stained massive with blocky fracturing. May be local disconformity between this sandstone and conglomeratic so below: few meters at contact not exposed. cgl fairly fine grained. 10