FAUNAL RELATIONSHIPS OF THE MEGANOS GROUP 143 
of the sequence, and if they had made sufficient collections, would 
undoubtedly have recognized the proper sequence. 
EOCENE SECTIONS IN THE SOUTHERN PART OF CALIFORNIA IN 
WHICH THE MEGANOS GROUP IS REPRESENTED 
In my first paper on the Meganos Group, reference was made to 
two Eocene sections in southern California, in which Meganos beds - 
are present. One of these sections is north of Coalinga, on the west 
side of the San Joaquin Valley; and the other is in the vicinity 
of Simi Hills, Ventura County. During the summers of 1918 
and 1919 several weeks were spent in studying these sections 
and also the Eocene at the south end of the San Joaquin Valley, 
where the type section of the Tejon is situated. The results of 
this work showed conclusively that beds of both Meganos and 
Tejon age are present in all of these areas, and that there is in 
each an unconformity separating the strata of these two series. 
The faunas from the Meganos of these three areas are very similar, 
containing in common a considerable number of highly ornamented 
species." 
THE SECTION NORTH OF COALINGA 
Unconformity——The unconformity between the Tejon and 
Meganos groups, in the Eocene section north of Coalinga, has 
been described by several writers,? most of whom considered the 
beds below the unconformity to be of Martinez age, while the 
beds above were considered to be Tejon. Dickerson? expressed 
the opinion that the Turritella andersoni beds, those here referred 
t One of the most common species found in the Meganos of southern California 
is Turritella andersoni; in the past these beds have sometimes been referred to as the 
Turritella andersoni beds. This species is also found in the Meganos to the southeast 
of Mount Diablo. 
2]. A. Taff, “Eocene of the Coalinga—Cantua District, Fresno County, Cali- 
fornia,’ Proc. Pal. Soc. America (1913), p. 127; E. T. Dumble, “Notes on Tertiary 
Deposits near Coalinga Oil Field and Their Stratigraphic Relations with the Upper 
Cretaceous,” Jour. Geol., Vol. XX (10912), pp. 28-37; Robert Anderson and Robert 
Pack, “Geology and Oil Resources of the West Border of the San Joaquin Valley, 
North of Coalinga, California,” U.S. Geol. Survey, Bull. 603 (1915), p. 66; R. E. 
Dickerson, “Stratigraphy and Fauna of the Tejon Eocene of California,” Univ. Cal. 
Pub. Bull. Dept. Geol., Vol. TX (1916), No. 17, pp. 382-87. 
3R. E. Dickerson, Univ. Cal. Pub. Bull. Dept. Geol., Vol. TX (1916), No. 17, 
Ppp- 382-87. 
