20G 



J. S. DILLEE — GEOLOGY OF CALIFORNIA AND OKKGON. 



In his excellent correlation paper on the Cretaceous,* Dr C. A. White 

 has given a bibliography and concise review of the work already done 

 on the rocks of that system in the Pacific border region from California 

 to Alaska, The present state of knowledge, so far as California is con- 

 cerned, may be most clearly expressed by the following tabular view, 

 which I copy from Dr White : f 



He considers the Chico-Tejon to be the upper portion of the upper 

 Cretaceous, and that it continues upward into the Eocene. The Shasta 

 formation, which is composed of the Horsetown and Knoxville beds, is 

 confined wholly to the lower Cretaceous. There is supposed to have 

 been a long time interval X between the deposition of the Shasta and 

 the Chico-Tejon, and the final portion of this interval is supposed to be 

 represented by the Wallala formation. 



My first object in this paper is to adduce evidence in support of the 

 following propositions : 



1. The Cretaceous strata of northern California and Oregon, embracing 

 the Chico, Horsetown and Knoxville beds, are an essentially conformable 

 and continuous series of sediments, formed without distinct interruption. 



2. These strata were deposited while the region was gradually sub- 

 siding and the sea was transgressing northern California and Oregon. 



* Bulletin 82, I". S. Geological Survey, 1891. 



t Ibid., p. 241. 



t [bid., pp. 189, L90. 



