Field Notebook: SD, WY 1981
Page 47
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
Dave Lzuances' zvez. June 21,72. (21) NW - SE shoreface sands stick to SE toward sea. To NW 90 breckish + FW, briefing Genil sequence SFss. to breck+FW. 4 episodes in this pivot (lower 6-700 Azbule). Trans. discord. sopzuele units, whole sequence ~ Blair (compzn.) Dzos Loc 1. (Sec #7) Starts with lower massive S+F ss, biothurb with burrows incl Ophio. Burrows both V and h. Multidirectional Ophio. This ends fairly abruptly, locally at a platy Fe source which contains shell ghosts (?ray) and may be a lag. Above is med. trough X b. interp. zs normal wave base rep. upper shore face in contrast- to LSF of biothurb unit. The USF sand has some Ophio compx. Above the USF sand quades (just contact exposed but crab remains in uppermost ss) in to shale, brn with plant hash. Transgressive discord inferred here but covered) #2 Next LSF szud unit was good found in conc-like masses in lower 50', including summites. Plecenticeras sp. + Baculites Bedding very even throught sand except #3 23