ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OF SAN PEDRO. 



23 



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



FOUND at DeADMAN IsLAND. 



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

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



PELECYPODA. 



Hmnilm giganteus, P Scmele di-cisa, P 



GASTROPODA. 

 Pachypoma incequale, P 

 Paludf strhia curta, E 

 Paliidcxirina stokesi, E 

 Physa hiterostropha, P 



Calliostoma tricolor, P 

 Crucibuliim spittosum, P 

 Margarita var. knechli, E 

 Odostomia tiniiin, P 



Ptanorbis lumidus, S 

 Planorhis vcrmicularis, 

 Scala crebrir.oHtata, P 

 Turboiiilla stcarnsii, S 



Upper San Pedro Seriea. — Resting on the 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 thickne.ss. 

 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 hut 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 bluflf north of the San 

 Pedro valley. 



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



Angulus button! 

 Cardium corbis 

 Chama peltiicida 

 Cryptomya cali/oriiira 

 Cumingia californica 

 Ijonax Imrigata 

 Glycymeris barbare7iisis 

 Glycymeris scptcnlrionali.i 

 Hinnitiis gigantitis 

 Lixvicardium substrialum 

 Li-da taphria 

 Lucina acutilineata 

 Lucina californica 

 Lucina nuttalli 

 Lyonsia calij'o rttica 

 Macoma iiiqitinata 



AcnicBa iii-soisa 

 Acmaia spi-ctrum 

 A mphissa Vf rsic o lo r 

 Bittiitni q uadrifi/atiim 

 Bittium rugnlum 

 Bulla punctulata 



PELECYPODA. 



Macoma nasuta 

 Macoma secta 

 Mactra catilli/ormis 

 Mactra falcata 

 Metis alta 

 Modiola ri'.cta 

 Mylilus edulis 

 Panopea generoxa 

 Pecten latiauritus 

 Pectc.n var. monotimeris 

 Pecten subnodoxux 

 Pecten ventricosus 

 Periploma argentaria 

 Peiricola carditoides 

 Pholadidea pcnita 

 Platyodon cancellatus 



GASTROPODA. 



C'aUios/oma canal ic u la I u m 

 Ceriihidea californica 

 Chlorostoma brunneum 

 Chloroslomn funebrale 

 Chlorostoma var. subapnrttim 

 Chlorostoma gallina 



Pododcsmus macroschisma 

 Psephis tantilla 

 Kupellaria lamellifera, 

 Sazidomus aratus 

 Semele decisa 

 Solen rosaceus 

 Solen aicarius 

 Tagelus californianus 

 Tapes staviinea 

 Tapes tenerrima 

 Tellina bodegensis 

 Tivela crassatclloldcs 

 Tresus nuttalli 

 Venus simillima 

 Venus succincta 

 Zirphaia gabbi 



Chlorostoma monlereyi 

 Chlorostoma var. ligulalum 

 Columbella gausajyata 

 Columbella var. carinata 

 Columbella tuherosa 

 Conus caiifornicus 



