J. p. Leslc>^. 



Plate X 



Proc. A.K SJjiC. iSbii 



■Vicj. i^. Vietv 0^ Cali?Jouia Ore [icmk 





Nortk MouTi ham 



piA . *] , Sftt'ion Cicroif tk(; CuniberUiKl Vall?y, 



VK4.IO, Stchou 10 milfs eailr a^ Ha.rr\sbuvg 



NortK Mt. 



V'^ il. Ideal section o\\\\e ontienj- sor^ficc. 



Lowest Silurian. 



