[[preprinted]] 0019 [[/preprinted]] 
October 8 
Visited ridge east of Frenchman Flat. Mottled zone lies above heavy- 
bedded limestone, is probably about 150 feet thick. Consists of fairly 
thin-bedded limestone teeming with silicified brachiopods 
Above brachs comes thick bed of massive limestone perhaps 200 feet 
thick crowded with [[underlined]] Maclurites [[/underlined]] and large 
[[underlined]] Receptaculites [[/underlined]] in the lower part and 
[[underlined]] Mitrospira [[/underlined]] above. Above this rocks are 
poorly fossilferous 
About 5' below Eureka quartzite occurs Orthis and silicified bryozoa 
suggesting [[underlined]] Anomalorthis [[/underlined]] zone. 
Eureka consists of a thin quartzite followed by limestone, then a thick 
bed of quartzite. The limestone band between the quartzites contained 
poorly corals suggesting [[underlined]] Favosites [[/underlined]]. 
[[image in left margin, soil profile: three soil layers. No caption in first, 
caption "Mitrospira Receptaculites" in second, caption "Orthidella" in 
third]] 
Brachiopod bed is exposed on south side of a canyon and along the cliff 
facing west on the south side of the canyon. The spur forming south wall 
of canyon is offset from main cliff with dip SW and small isolated mass 
exposing only brachiopod bed and Receptaculites bed. On north wall 
canyon dips are to SE. 
G. Arthur Cooper - Field Notes and Maps, 1939 
Transcribed and Reviewed by Digital Volunteers 
Extracted Oct-09-2015 11:35:33 
Smithsonian Institution Transcription Center, Smithsonian Institution Archives 
