Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 6\ 



navicular e Mant., both in the Phcenix beds and in the 

 Ootatoor; but the Ootatoor beds have been correlated 

 with the Cenomanian, and both these forms are hkewise 

 found in rocks of that period in Europe. On the whole, 

 however, the strongest affinities are undoubtedly with the 

 Turonian; and if one remembers the great stratigraphical 

 range of some of the species of the Sacramento Valley, it 

 does not seem remarkable that Cenomanian or even Gault 

 types are found occasionally in the Chico. 



Mention might be made here of the Upper Cretaceous 

 beds occurring on the west coast of Chile. Whether these 

 beds are to be correlated more closely with the Upper or 

 Lower Chico has not been very satisfactorily ascertained, 

 but a few of the species found there indicate a rather low 

 horizon. Phylloceras ramosiim occurs in the lower part of 

 the Chico in all of the more northern localities ; Desmocei'as 

 (Piizosia) darwini has a close ally in D. ashlandicutn of the 

 Phoenix beds; Lytoceras varuna is found in the Ootatoor 

 beds of India; and the Hamites, resembhng //. cylindraccus 

 de France, is also in accord with the lower horizon. 



The exact position of Lytoceras kayei in the Californian 

 beds has unfortunately not been learned. It is only known 

 to come from the Chico of Mount Diablo. It appears, 

 therefore, that along the Pacific Coast of America from 

 British Columbia southward to Chile the overlap of the 

 later Cretaceous, including the Lower Chico and its equiv- 

 alents, is satisfactorily seen in most, if not all, of the widely 

 separated locahties of southern Vancouver, Rogue River 

 and Sacramento valleys, Southern California, Todos 

 Santos Bay, and Quiriquina Island, on the coast of Chile. 

 It seems hardly probable that a movement of so great 

 north and south range should be unaccompanied by parallel 

 disturbances in regions lying so nearly contiguous as that 

 of the interior basin ; and there appears to be both faunal 

 and stratigraphical evidence that contemporaneous move- 

 ments occurred in the two regions on opposite sides of the 

 Cordilleras. 



