18 



CALIFORNIA ACADEMY OF SCIENCES. 



is represented by the strata of San Pedro and Deadman Island. The writer, there- 

 fore, proposes the name San Pedro Series for the series of Pleistocene strata at San 

 Pedro, including the lower and upper formations, as described in the present paper. 

 Lower San Pedro Series. — A stratum of gray sandstone rests unconformably on 

 the brown Pliocene sandstone of Deadman Island. (See diagram B, PI. XXII.) 

 In some places the sand is soft; in others it has been cemented until it is very hard. 

 The soft parts are not fossiliferous, as a rule, while the hard parts are made up in 

 some places almost wholly of beautifully preserved fossils. One locality in particular 

 on the west side of the island, near the north end, is filled with finely preserved 

 specimens. Parts of this bed are very hard, making it almost impossible to get the 

 shells out, while other parts are so soft that the shells can be removed from the 

 matrix with the fingers. This stratum varies in thickness from four to ten feet on 

 the west side to nearly twenty feet on the east side of the island. There seems to be 

 little indication of bedding planes in this stratum. The general dip is to the north. 

 On account of its lying unconformably on the Pliocene, being of different lithological 

 composition, and containing a fauna of which a great number of species have never 

 been found in the Pliocene, this horizon is designated in the present paper as the 

 lower San Pedro series, or the lower part of the Pleistocene. The following species 

 have been obtained from the lower San Pedro gray sand stratum of Deadman Island: 



List of the Fossils of the Lower San Pedro Beds (Lower Pleistocene) of 



Deadman Island. 



(P indicates species living at San Pedro; N indicates species living only north of San Pedro; S indi- 

 cates species living only south of San Pedro; E indicates extinct species or those not known as living.) 



Anffulus buttoni, P 

 Anomia lampe, P 

 Bornia relifcra, N 

 Callisla var. pedroana, E 

 Cardium cordis, N 

 Cardi'im procerum, S 

 Chama pellucida, P 

 Clidiophora punclala, P 

 C'ooperella subdiaphana, V 

 C'orbula luteola, P 

 Cryjjlomya californica, P 

 Ciiminyia californica, P 

 Diplodonta orbclla, P 

 Donax californica, P 

 Donax Ufvigata, P 

 Kellia laperousii, P 

 KMia siiborbicularis, P 

 Kennc.rlia bicarinata, N 

 Kennirliajilosa, N 

 Laivicardium subslriatum, ] 

 Lazaria suhipiadrata, P 

 Ledafonsa, N 

 Leda hamata, P 

 Leda var. prcecnrxor, N 

 Leda taphria, P 



PELECYPODA. 



Lima dehiscens, P 

 Lucina aculilincala, P 

 Lucina californica, P 

 Lucina nutlalli, P 

 l^yonsia californica, P 

 Macoma calcarea, N 

 Macoma inquinata, P 

 Macoma nasuta, P 

 Macoma secla, P 

 Macoma yoldiformis, ] 

 Mactra falcata, P 

 Metis alia, P 

 Modiola fornicata, N 

 Modiola recta, P 

 Moerella salmonea, N 

 Mi/tilus edulis, P 

 Mi/lilimeria nutlalli, Ir 

 Neiera pectinata, P 

 Nucida caatrensis, P 

 Nucula suprastriata, I 

 Oslrea lurida, P 

 Panopca generosa, P 

 Pecten caurinus, N 

 Peclen haslatus, P 

 Pecten hcriceus, N 



Pecten var. strategus, N 

 Pecten jordani, E 

 Pecten latiauritus, P 

 Pecten var. monotimeris, I 

 Petricola carditoides, P 

 Petricola denticulata, S 

 Protocardia centifilosa, P 

 Psephis salmonea, N 

 Pscphis tanlilla, N 

 Racta midulata, P 

 Saxidomus aratns, P 

 Semele var. montereiji, N 

 Septifer hifurcatus, P 

 Siliqua lucida, P 

 Solen rosaccus, P 

 Solen sicarius, P 

 Tapes siaminea, P 

 Tellina bodegensis, P 

 Tivela crassatelloides, P 

 Venericardia barbarensis, 

 Venericardia vcntricosa, J> 

 Ve7ms simillima, P 

 Verticordia novemcoslata, 

 Yoldia scissrtrala, P 



