ARNOLD — THE PALEONTOLOGY AND STUATIGRArUV OF SAN PEDKO. 



23 



List of Fossils from the Lower San Pedro Beds of the San Pedro Bluffs not 



FOUND AT DeADMAN IsLAND. 



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

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



Calliosloma tricolor, P 

 Crticibutiim spinostiin, P 

 Margarita var. knrchti, E 

 Odostomia tenuis, P 



PELECYPODA. 

 Hinnites giganleus, P 



GASTROPODA. 

 Pachypoma inuquale, P 

 P aludf slrina curta, E 

 Palude/itrina stokesi, E 

 Physa hctcroslropha, P 



Scmele dccisa, P 



Planorbis tumiduK, S 

 Planorbia vcrmicutaris, 

 Scala crebricostata, P 

 Turbonilla stcarnsii, S 



Upper San Pedro Series. — Resting on tlie gray sandstone of the lower San 

 Pedro series at Deadman Island is a stratum of fossiliferous gravel hardened by calca- 

 reous cement. (See Diagram B, PI. XXII.) This stratum, which extends over the 

 whole island at about six feet below the surface, is from two to three feet in thickness. 

 The matrix varies from fine sand to water-worn pebbles of Miocene shale, many of 

 which are full of pholas holes still containing the shell. The fossils are well pre- 

 served, and, in all but a few localities of exceptional hardness, may be removed from 

 the matrix with the fingers. This stratum lies nearly horizontal. Water-worn boulders 

 of the gray lower San Pedro sandstone occur in the upper San Pedro conglomerate at 

 Deadman Island. This evidence indicates an unconformity between the lower and 

 upper San Pedro series. Similar evidence is noticeable in the bluff north of the San 

 Pedro valley. 



List of Fossils from the Upper San Pedro Gravel Stratum, Deadman Lsland. 



Angulus butloni 

 Cardium corbis 

 Chama pellucida. 

 Cryplomya californica 

 Cumiyigia californica 

 Donax hevigata 

 Glycymeris barbarcnuis 

 Glycymeris septnitrionaliH 

 Hinnites giganteus 

 Lcevicardium substriatiim 

 Leda taphria 

 Lucina acutilineata 

 Lucina californica 

 Lucina nultalli 

 Lyonsia californica 

 Macoma inquinata 



Actncea inscsfia 

 Acmcea spectrum 

 Amphissa versicolor 

 Bitiium quadrifiUUuin 

 Bitlium rugatum 

 Bulla punctulala 



PELECYPODA. 



Macoma nasuta 

 Macoma secla 

 Mactra calilliformis 

 Mactra falcata 

 Metis alta 

 Modiola recta 

 Mytilus edulis 

 Paneij)ea gcnerosa 

 Pecten latiaurilus 

 Pecten var. monotimeris 

 Pecten subnodosus 

 Pecten vcntricosus 

 Periploma argentaria 

 Petricola carditoides 

 Pholadidea penita 

 Platyodon cancellatus 



GASTROPODA. 



C'aUiosloma canaliculalum 

 Cerilhidea californica 

 Chlorosloma brunmmm 

 Chlorostoma funebrale 

 Chlorosloma var. subapertum 

 Chlorostoma galtina 



Pododesmus macroschisma 

 Psephis tantiUa 

 Jiupellaria lamelUfera 

 Saxidomus aratus 

 Semele decisa 

 Solen rosaceus 

 iSoleu sicarius 

 Taijelus calif ornianus 

 Tapes staminca 

 Tapes tenerrima 

 Tellina bodegensis 

 Tivela crassatelloides 

 Tresus nuttalli 

 Venus simillima 

 Venus succincla 

 Zirpheea gabbi 



Chlorostoma montereyi 

 Chlorostoma var. ligulalutn 

 Columbella gausapala 

 Columbella var. cariufcta 

 Columbella tuberosa 

 Conus californicus 



