Gkol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 39 



It appears that the disturbances of the West Coast have 

 been to some extent local, though probably synchronous 

 during the Chico epoch. Further evidence of this is also 

 found in the deposits of Southern Oregon and Siskiyou 

 County, California, where the fauna seems to indicate for 

 these localities a different basin. The Oregon Basin was 

 probably not directly connected with that of the Sacra- 

 mento, at least until during the later Chico. Species that 

 belong characteristically to the upper horizon are found 

 plentifully common in the two basins, while in the lower 

 horizon they are essentially different. There is a closer 

 relationship between the deposits of Southern Oregon and 

 Vancouver Island than between those of the latter and of 

 the Sacramento Valley. There is also a representation of 

 Upper Missouri — Colorado — forms in the fauna of Southern 

 Oregon, as will be seen in the species of Inoceramus and 

 Scaphites, and in some of the ammonites. 



The cephalopods of these lists form one of the most 

 striking features. The numerous species of Schloenhachia^ 

 alone, almost distinguish this basin from others of the 

 Pacific Coast; while to these may be added six species of 

 Scaf kites, two species of Acanthoceras, two of Lytoceras, 

 besides the aberrant forms, including Hamites, Helicoceras, 

 and Heteroceras. 



The Phoenix locality is regarded as representing strati- 

 graphically the Lower Chico horizon of the Sacramento, 

 yet the differences of the faunas are considerable. 



Attention is also called to the occurrence in the Oregon 

 Basin of such forms as Desmoco'as siigaUim, Scaphites 

 gillisi, Scaphitcs klamathensis, Goniomya borealis, and P}'o- 

 tocardmrn scituluni. Many others will also be noticed that 

 seem to have special importance; these will be mentioned 

 under the heading of correlation. 



While there are fewer species of cephalopods that con- 

 nect these beds directly with those of the Lower Chico in 

 the Sacramento Valley, the large number of cephalopods, 



' In the sumrner of iSgg, Dr. J. P. Smith discovered in the Lower Chico of Silverado 

 Canyon, Orange County, California, Schlaenbachia oresorunsis and others of this genus like 

 those of the Oregon Basin. 



