Field Notebook: CO 1951a
Page 43
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
If Golden clouds be best at all times may be here. dark gray. Varies in thickness laterally, silty claystone with local thin beds siltstone grades to argill. siltstone - whole with punched conch fracture. 9.0 Interbedded massive fine grained light gray sandstone (argillus high) and argillaceous siltstone and fine ss (weths bluegray). Interbedding irreg., most common top and lower 2 feet where float fragments to slowly, shaley is to silty shale. Later dk gray with blunt cross. Altho local discont betw. this & ss below they are similar - espec. where 'argillaceous beds of this unit punch out laterally - as they do. Sandstone, fine grained to silty, laminated, similar to above & locally continuous with it, tho above has silty clay ptgs & this doesn't. Both not very resistant but loc. worth to bluffs on slope, typically laminated, with cross lam. minor, upper part pitted where clay worn out. Worth col light gray with yellow stain on some with bedding. 5.8 Interbedded silty shale, dk gray, with shaley siltstone Siltstone in thin beds highly festened, locally beds faintly hard siltstone up to .3. slope wash Above interval represents only upper part of shaley siltstone unit at base of continuous exposures end there. Supplementary section - About 100 ft along strike NW of road side exposures. Mtrs. from base of ss unit (9.0+13.0) shown above, (9.0+13.0) Sandstone 14.0 Interbedded silty shale & siltstone, as above. Upper 9'2 covered by slope was lower H:8 as above becoming more shaley downward. 19