Geol.— Vol. II.] ANDERSON— CRETACEOUS DEPOSITS. 59 



It has been pointed out by Whiteaves and others that the 

 overhip of the Nanaimo strata in the Vancouver basin 

 accompanied a subsidence of the Cordilleran region which 

 resulted in the final connection of the Pacific and interior 

 waters. This has been conclusively established not only 

 by the presence of Inoceramiis labiatus, a form very abun- 

 dant in the upper portion of the Colorado group, occurring 

 also in the upper beds of the Queen Charlotte Islands, but 

 by others, 



Whiteaves (1876-84, p. 188) has published a list of related 

 species, occurring in the upper beds of Vancouver and in the 

 Cretaceous of upper Missouri, which are intended to show 

 the commingling of faunas of this period. To these lists 

 may now be added other important forms from the later Cre- 

 taceous beds of Southern Oregon. No less than six species 

 of Scafhites, eight species of Schlocnbachia, two species of 

 PIacentice?'as, five species of Inoceramus, and many other 

 forms, have been found here that strongly recall the fauna 

 of the Colorado group. Nor is the resemblance one of 

 only general groups and genera. Many of the species 

 are either very closely related or are identical. Besides 

 Inoceramus labiatus, the list includes a species resembling 

 /. mytiloides Con., Prionocyclits branneri (very close to 

 P. zuoolgari (Mant.) Meek), Scaphites gillisi (still more 

 closely related to S. warreni M. & H.), and S. klamath- 

 ensis, which may be an equivalent of S. larvceformis 

 M. & H. from the lower portion of the Colorado. Other 

 members of the genus Schlocnbachia resemble Prionocychis 

 ivyomingensis. These species have been given other spe- 

 cific names; yet the very close affinities with those of the 

 Colorado group can hardly be doubted. 



The close resemblances in the faunas of the more north- 

 ern Pacific border basins and those of eastern Asia are 

 shown in the following parallel lists from the Upper Creta- 

 ceous of the Oregon Basin and that from the Island of 

 Ezo (Jokoyama, 1889) : — 



