AKNOLD — THE PALEONTOLOGY AND STKATIGKAPHY OF SAN PEDKO. 



23 



List of Fossils fkom 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 Sau Pedro ; S indicates species 

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



Calliostoma tricolor, P 

 Crucibulum spinosum, I 

 Margarita var. knechti, 

 Odostomia tenuis, P 



PELECYPODA. 

 Hinniles giijanleus, P 



GASTROPODA. 

 Pachypoma inaquale, P 

 Paludi strina citrta, E 

 Paludestrina stokesi, E 

 Physa heterostropha, P 



Semele dccisa, P 



Planorbis tumidus, S 

 Planorbis vermicularis, 

 Scala crebricostata, P 

 Turbonilla stearnsii, S 



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

 Pedro series at Deadraan 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 witli 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 vallev. 



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



Angulus buttoni 

 Cardium corbis 

 Chama pellucida 

 Cryplomya californica 

 Cumingia californica 

 Donax Icevigata 

 Glycymeris barbarensis 

 Glycymeris septnitrionalis 

 Hinnites giganteus 

 LcEvicardium substrialtini 

 Leda taphria 

 Lucina acutilineata 

 Lucina californica 

 Lucina nuttalli 

 Lyonsia californica 

 Macoma inquinata 



AcmcBa inscsna 

 Acmoia spectrum 

 Amphissa versicolor 

 Bitlium quadrif latum 

 Bittium rugatum 

 Bulla punctulata 



PELECYPODA. 



Macoma nasuta 

 Macoma secta 

 Mactra catilliformis 

 Mactra falcata 

 Metis alia 

 Modiola recta 

 Mytilus cdulis 

 Panopea gcnerosa 

 Pecten latiauritus 

 Pecten var. monotlmeris 

 Pecten subnodosus 

 Pecten ventricosus 

 Periploma argentaria 

 Petricola carditoides 

 Pholadidea penita 

 Plalyodon cancellalus 



GASTROPODA. 



Calliostoma canaliculatum 

 Cerithidca californica 

 Chlorostoma brunneum 

 Chlorostoma funebrale 

 Chlorostoma var. subaperlnm 

 Chlorostoma gallina 



Pododesmus macroschisma 

 Psephis tantilla 

 Pu2)ellaria lamellifera 

 Saxidomus aratus 

 Semele decisa 

 Solen rosaceus 

 Solen sicarius 

 Tagelus californianus 

 Tapes staminea 

 Tapes tcnerrima 

 Tellina bodegensis 

 Tivela crassatelloides 

 Tre.sus nuttalli 

 Venus simillima 

 Venus succincta 

 Zirphma gabbi 



Chlorostoma montereyi 

 Chlorostoma var. ligulalum 

 Columbclla ga usapata 

 Columbella var. carinata 

 Columhella tuberosa 

 Conus californicus 



