78 



FRANCIS P. SHEPARD 



The thickness of the conglomerate is about 200 feet. Against 

 it on the east, with apparent conformity, is gray hmestone. This 

 contains a scattering of pebbles in the portion next the conglomerate. 

 Six hundred and fifty feet below the top of the limestone is a bed 

 containing fossils of Richmond age. As these beds are vertical, 

 the age relations of the conglomerate to the limestone are not 

 shown by the structure, but since somewhat older Ordovician faunas 



Fig. I. — The red conglomerate near the Sinclair Hot Springs 



occur farther east, the conglomerate is known to be 650 feet above 

 strata containing the Richmond fauna. Above the bowlder bed 

 there is a break in the succession, and above the break is massive 

 crystalline limestone in which no fossils were found. Farther west 

 there is severe faulting which cuts out further evidence from fossils 

 on that side. From the evidence on the east it was concluded that 

 the age of the formation probably is Silurian because of the 650 

 feet of Hmestone between it and the fossil bed which represents 

 the top of the Ordovician. 



