302 University of California Publications in Geology [Vol. 10 



Other Santa Margarita Localities Compared 

 TEJON HILLS 



In the Tejon Hills at the south end of the San Joaquin Valley, a 

 fauna has been collected 14 which includes several typical Santa Mar- 

 garita species. The fossils occur in coarse, white, arkose sand with 

 lenses of clay and gravel. The pebbles consist essentially of rhyolite. 

 The fossiliferous marine member is about 50-100 feet thick. Above 

 this member is a formation consisting of reddish land-laid beds, the 

 Chanac formation, in which remains of land mammals are found. A 

 lower Pliocene horse, Protohippus tejonensis, has been described from 

 the land-laid beds by Professor Merriam. 15 It resembles very closely 

 a form listed by Arnold and Anderson 10 and by the writer 17 from near 

 the base of the "Jacalitos" formation in the Coalinga region. The 

 marine invertebrate fauna collected in the Santa Margarita of the 

 Tejon Hills consists of the following species : 



Santa Margarita Fauna from Tejon Hills 



Pelecypoda Saxidomus nuttalli Conrad 



Dosinia ef. arnoldi Clark Siliqua, cf. lueida (Conrad) 



Metis alta (Conrad) Solen, sp. 



Ostrea titan Conrad Teredo, sp. 



Ostrea, of. vespcrtina Conrad Venus pertenuis Gabb 



Pecten crassicardo Conrad Gastropoda 



Peeten crassicardo biformatus, Bulla, sp. 



n. var. Calyptraea, sp. 



Pecten hastatus Sowerby Conus, sp. 



Pecten raymondi Clark Fusinus tabulator, n. sp. 



Phacoides richthofeni (Gabb) Nassa pabloensis Clark 



Phacoides sanctaecrusis Arnold Natica, sp. 



Pinna alamedensis Yates Pisces 



Pitaria stalderi Clark Shark teeth 



SAN LUIS QUADRANGLE 

 A Santa Margarita fauna has been collected 18 from a sandstone 

 member at the base of what has been mapped as Monterey shale by 

 Fairbanks 19 in the San Luis Quadrangle. The sandstone is of a 



14 Tejon Ranch, about twenty miles southeast of Bakersfield, Caliente quad- 

 rangle; on west side of last large tributary of Tejon Creek, which cuts the Tejon 

 Hills near north end, approximately western boundary of NW Vi sec. 13, T. 32 S, 

 R. 29 E, M. D. B. & M. Collected by Dr. B. L. Clark. 



15 Merriam, J. C, New horses from the Miocene and Pliocene of California, 

 Univ. Calif. PubL, Bull. Dept. Geol., vol. 9, no. 4, p. 52, 1915. Also: Merriam, 

 J. C, Mammalian remains from the Chanac formation of the Tejon Hills, Cali- 

 fornia, Univ. Calif. Publ., Bull. Dept. Geol., vol. 10, no. 8, pp. 111-127, 1916. 



is Arnold, Ralph, and Anderson, Robert, Geology and oil resources of the 

 Coalinga district, etc. 



it Nomland, J. O., Relation of the invertebrate to the vertebrate faunal zones 

 of the Jacalitos and Etchegoin formations in the north Coalinga region, Califor- 

 nia, etc. 



is Approximately northern boundary of sec. 18, T. 29 S, R. 11 E., M. D. B. & 

 M. Collected by B. L. Clark. 



is Fairbanks, H. W., U. S. Geol. Surv., San Luis Folio, no. 101, 1904. 



