THE MARINE TERTIARY OF THE WEST COAST 591 
OLIGOCENE 
Accumulated evidence appears to show that there were at least 
two distinct epochs of deposition on the West Coast during the Oligo- 
cene. ‘The two epochs are represented by the Molopophorus lin- 
colnensis and Acila gettysburgensis zones of Dr. C. E.Weaver. They 
Fic. 4.—Tejon (Upper Eocene) 
will be referred to as the Lincoln and San Lorenzo.*. Recent field 
work of the writer has shown fairly conclusively that there were at 
least two distinct epochs of deposition in Oregon and Washington. 
He believes that this will prove to be the case in California when more 
detailed work on the stratigraphy of the Oligocene over wider 
areas has been completed. It is certain that the two faunas first 
tC. E. Weaver, ‘‘Tertiary Formations of Western Washington,” Wash. Geol. 
Surv., Bull. 13 (1916), pp. 1-21; “‘ Preliminary Note on the Paleontology of Western 
Washington,” Wash. Geol. Surv. Bull., 15 (1912), pp. 1-80; ‘‘Tertiary Faunal Horizons 
of Western Washington,”’ Pub. Univ. Wash., Vol. I (1916), No. 1, pp. 1-67. 
