[[preprinted]] 0015 [[/preprinted]] 
Sept. 26. 
Spent day at Lone Mtn. Drove into mountain by middle road. Drove clear 
on to Silurian outcrop. Went up over Devonian to see Nevada limestone. 
Nevada limestone best exposed just NW of westernmost saddle 
between Silurian and Dev. Lower Nevada for 3 or 400 feet is thin- 
bedded and fossils shell out of it easily. In the lower part at the saddle 
Meristella occurs. Then follows the Chonetes with straight ribs. Above 
come large Schizophoria, and Gypidula "cornis". 
Upper Nevada chiefly heavy-bedded dolomite. 
In afternoon worked on Pogonip at southwest base of the mountain. In 
the upper 75' occur many snails, Anomalorthis. At 75' below top occurs 
Desmorthis. Mitrospira at 160' below top, Hesperonomia at 235'. 
Receptaculites was seen in place 10'-20' above Mitrospira. 
On Aug. 30, 1946 I measured with 27° dip, 200' from Desmorthis to 
base of Eureka. 150 from Receptaculites. Receptaculites to Desmorthis; 
estimated 50' from Mitrospira to Receptaculites. Figures for 1939 are 
wrong. 
[[margin]] [[faint writing]] [[/margin]] 
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 
