4 
594, BRUCE L. CLARK 
in the former horizon that are also found in the Tejon and the 
generic assemblages are notably similar. The Molopophorus 
lincolnensis zone, however, shows a closer relationship to the 
Acila gettysburgensis zone (Upper Oligocene) than to the Tejon, 
and subsequent work on the fauna of the Molopophorus lincolnensis 
Fic. 5.—Lower Oligocene 
zone has shown that there are fewer species common to the Tejon 
than Dr. Weaver supposed.’ 
There is still another fauna which may represent an Eocene 
stage higher than the Tejon. During the year 1912 a collection 
was made by Mr. F. M. Anderson and Mr. Bruce Martin, at that 
time curator and assistant curator in the department of paleontol- 
ogy of the California Academy of Sciences, from the Greise Ranch 
tC, E. Weaver, “Preliminary Report on the Tertiary Paleontology of Western 
Washington,” Wash. Geol. Surv., Bull. 15 (1912), p. 16; “Tertiary Formations of 
Western Washington,” Wash. Geol. Surv., Bull. 13 (1916), p. 167. 
