C. H. Hershey — Cretaceous Outliers in Calif oymia. 37 



the deep broad basin on the floor of which Mt. Shasta and the 

 Cascade range have been bnilt up. The phenomena are sim- 

 ilar to those which characterize the Sierra Nevada region with 

 its short steep slope on the east and a long gentle slope on the 

 west, and suggest that the northeastern face of the Klamath 

 Mountains marks the line of a great fault ; but the relation 

 between the steeply inclined Cretaceous strata and the older 

 rocks shows that the structure is that of a sharp monocline 

 rather than a fault. 



The Sierra Costa Mountains rise abruptly above a supposed 

 Cretaceous remnant near TTeaverville and on the northeast 

 they are terminated by the sharp monocline above-mentioned. 

 They must have been one of the abnormally elevated portions 

 of the post-Chico mountain system. 



Berkeley, California, 



