1916] Packard: Cretaceous of Santa Ana Mountains 157 



Henley beds may be shown to be homotaxially equivalent, and equiv- 

 alent also to the beds of the Colorado group in the interior basin." 30 

 Anderson gives parallel lists of identical or closely related species 

 found in the Chico and the Island of Ezo. His view of the relation- 

 ships of the Chico to the European Cretaceous is best expressed in 

 his own words : 



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. 31 



A correlation table shows that Anderson considered the Chico as in- 

 cluding the Arrialon, Trichinopoli and a part of the Ootatoor groups 

 of Southern India. 32 



Stanton 33 takes issue with Anderson regarding the geographic 

 relation of this western fauna to that of the interior basin. 



Whiteaves and F. M. Anderson have argued for a connection during Chico 

 time between the Pacific and interior seas, but the evidence brought forward 

 in support of this view is based upon types that have a world-wide distribution 

 and on those that are only similar, not specifically identical. In my opinion 

 direct connection has not been proved. 



Stanton believes, however, that the Chico began a little earlier than 

 the Colorado group, including all of the Colorado and continuing a 

 little longer than that group. 



These citations are sufficient to indicate the major problems involved 

 in the correlation of the Chico with beds outside of the Pacific Coast 

 region. Further discussion of this problem will be considered in a 

 future paper. 



AGE 



The Cretaceous beds of the Santa Ana Mountains yield a fauna that 

 is more closely related to that from Chico Creek than to the fauna from 

 the Horsetown beds. The relationships of these faunas are shown in 

 the following table, in which there is indicated the number of species 

 from the southern fauna common to these northern faunas as defined 

 above. 



so Anderson, F. M., Cretaceous Deposits of the Pacific Coast, Proc. Calif. 

 A.cad. Sci., Third Series, Geol., vol. 2, p. 57, 1902. 

 ••si Op. ext., p. 62. 

 82 Op. cit., p. 62. 



33 Stanton, T. W., Later Mesozoic Invertebrate Faunas, in Outlines of Geo- 

 logic History, Willis and Salisbury, p. 190, 1910. 



