Geol— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 65 



Accordingly, almost the whole class of cephalopods listed 

 in his scheme have neither complementary elements nor 

 even contemporaries in the Comanche series. The con- 

 trast is therefore evidently less than it would appear to 

 be; but in so far as it is strictly applicable, it is quite 

 complete. 



On the other hand, as has been already shown, when 

 the fauna of the Colorado group is compared to that of the 

 Chico, particularly as represented in the basin of Southern 

 Oregon, a strong resemblance is apparent, and there is 

 promise of a still closer relationship being recognized when 

 the fauna has become better known. In the paper by Hill 

 already referred to, the Dakota beds are given a position 

 equivalent to the Cenomanian, and the facts made use of in 

 the present paper are entirely in accord with that correla- 

 tion. It appears, therefore, that the hiatus which has been 

 here described as existing between the Knoxville (Pas- 

 kenta) and the Chico beds over so large a part of the 

 Coast Range region of the West, has its parallel and con- 

 temporary phenomenon in the deposits of the interior; and 

 the subsidence that followed the lateral extension of land 

 conditions on both sides of the Cordilleran continent, was, 

 therefore, epeirogenic; that is, it was synchronous on both 

 borders of that continent. 



4. Equivalents of the Knoxville. 



The earlier Cretaceous deposits of the Pacific border and 

 of Texas are more or less indirectly correlated, since there 

 is little or no faunal resemblance between them, and they 

 are too remote from each other to warrant a lithological 

 comparison. Still, it is not amiss to recall the facts that 

 the most calcareous portions of the California Cretaceous 

 are those of the true Knoxville (or Paskenta) strata, which 

 are often not unlike the Hmestones of the Comanche. It 

 is these horizons between which Mr. Stanton (1897, p. 608) 

 has pointed out such striking faunal contrasts, but of which 

 he says: "The two faunas are complements of each 



