1916] Martin: Pliocene of Middle and Northern California 229 



dence is therefore not sufficient to establish a stratigraphic break 

 at this locality. 



The following fossils were collected by the writer from the 

 Merced Series at its type locality. The terms upper and lower are 

 used in connection with the fauna for correlation purposes. The 

 lower Merced includes that portion of the series which occurs 

 stratigraphically below the large landslide at Thorton Station. 

 The upper Merced is that portion occurring above the landslide : 



List of Fossils from the Lower Merced 



Echinodermata 



Scutella interlineata Stimpson 



Scutella, n. sp.? 

 Pelecypoda 



Area trilineata Conrad 



Cardium meekianum Gabb 



Cardium quadrigenarium Conrad 



Chione succincta Valenc. 



Cryptomya californica Conrad 



Macoma inquinata Deshayes 



Macoma nasuta Conrad 



Marcia gibbosus Gabb 



Modiolus rectus Conrad 



Mya japonica Jay 



Nucula suprastriata Carpenter 



Pandora grandis Dall 



Paphia staleyi Conrad 



Paphia staminea Conrad 



Paphia staminea, var. diversa 

 Sowerby 



Paphia tenerrima Carpenter 



Pecten, sp. 



Phacoides annulatus Reeve 

 Saxidomus giganteus Deshayes 

 Schizothaerus nuttalli Conrad 

 Schizothaerus pajaroanus Conrad 

 Siliqua nuttalli Conrad 

 Solen sicarius Gould 

 Spisula albaria Conrad 

 Spisula catilliformis Conrad 

 Tellina bodegensis Hinds 

 Zirphaea gabbii Tryon 



Gasteropoda 



Amphissa, sp. 

 Astyris richthofeni Gabb 

 Bittium asperum Gabb 

 Calyptraea radians Lamarck 

 Calyptraea filosa Gabb 

 Chrysodomus portolaensis (?) 

 Arnold 



Chrysodomus stantoni Arnold 

 Chrysodomus tabulatus Baird, var. 



colmaensis Martin 

 Crepidula grandis Midd. 

 Crepidula onyx Sby. 

 Crepidula princeps Conrad 

 Drillia inermis Hinds 

 Drillia mercedensis Martin 

 Neverita, sp. 



Nassa moraniana Martin 



Nassa mendica Gould 



Natica clausa Brod. & Sby. 



Olivella biplicata Sby. 



Olivella pedroana Conrad 



Pachypoma, sp. 



Pisania fortis Carpenter 



Pisania fortis, var. angulata Arnold 



Thais lamellosa Gmelin 



Thais lamellosa, var. septentrionalis 



Reeve 

 Thais lima Martyn 

 Tritonium, sp. 

 Cirripedia 



Balanus, sp. 



The following list was obtained from the upper Merced north 

 of Thornton Station : 



Echinodermata 



Echinarachnius excentricus Esch. 



Pelecypoda 



Cardium corbis Martyn 

 Cryptomya californica Conrad 

 Macoma inquinata Deshayes 

 Macoma nasuta Conrad 

 Mytilus edulis Linn. 

 Ostrea lurida Carpenter 



Paphia staminea Conrad 

 Saxidomus nuttalli Conrad 

 Transennella tantilla Gould 



Gasteropoda 



Acanthina engonatum Conrad 

 Astyris californica Gaskoin 

 Astyris gausapata, var. carinada 

 Reeve 



Cerithidae californica Ilald. 



