INTERPRETATION OF ENVIRONMENTAL CONDITIONS 217 



Mountain geosynclinal prism. This prism may be traced from Alaska 

 through the Great Basin to Arizona. 



The Western Belt is similarly largely made up of sedimentaries and can 

 be traced from Alaska to southern California. 



On page 547 is given a statement of the principles upon which his correla- 

 tions have been based. Most important of these, for the purposes of this 

 paper, is the statement that many of the beds, unfossiliferous in themselves, 

 have been placed in the geological column by tracing them north or south 

 until they can be connected with fossiliferous beds of known age. The 

 accepted correlations in the summary description of the stratigraphy of 

 British Columbia and portions of Alaska will seem far more reasonable if 

 the reader has the principles set forth by Daly in mind. 



In table 35, page 559, he places as equal in position (Carboniferous) 

 the following: 



Southeastern Alaska: Western British Columbia Western Geosynclinal Belt: 



Ketchikan series. and Yukon: Pend d'Oreille, Att- 



Central Washington : Cache Creek group. wood, Anarchist, Ho- 



Peshastin series, Haw- Oregon and northern Cali- zomeen, Chilliwack se- 



kins formation. Eastern fornia: ries. 



formation. Nosoni formation, Mc- Middle California: 



Cloud limestone, Baird Robinson formation, 



formation, Bragdon Calaveras formation, 



formation. 



In table 36 he states that all these formations were deposited as marine 

 sediments accompanied by vulcanism and are terminated above by un- 

 conformities or by contact with bathylithic intrusions. In table 37 he 

 states that the Pennsylvanian in the western belt was a time of marine 

 sedimentation with very widespread vulcanism (general?). Following this 

 there was probably widespread though not energetic movements and local 

 unconformity. 



On page 565 it is stated: 



"The Western belt is in deep contrast with the Eastern belt and in a large 

 way the two are in reciprocal relations. The area covered by the Western belt 

 has furnished most of the clastic material in the principal geosynclinal of the 

 Eastern belt; the Eastern belt has furnished most of the clastic material com- 

 posing the principal geosynclinal of the Western belt." 



On page 568 is given, in the summary of the geological history, a statement 

 concerning the late Paleozoic: 



"At or near the close of the Mississippian period the Western cordilleran belt 

 was certainly submerged, and the Eastern geosynclinal belt was broadly up- 

 warped, without other general deformation of the Rocky Mountain geosynclinal. 

 The main Pacific geosyncline was thus initiated or else deepened, so as to receive 

 a great load of Pennsylvanian sediments. Fossiliferous beds belonging to this 

 period have been found at intervals in the Western belt from the Columbia 

 River to Vancouver Island. So far as they are clastic their materials seem to 



