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University of California Publications in Geology [Vol. 9 



Gastropoda 



Calliostoma coalingensis Arnold 

 Calliostoma etchegoinensis, n. sp. 

 Calyptraea filosa Gabb 



Nassa californica Conrad 

 Neverita convexa, n. sp. 

 Olivella biplicata Conrad 

 Pleurotoma coalingensis Arnold 

 Thais lamellosa Gmelin 

 Thais kettlemanensis Arnold 

 Turritella vanvleeki Arnold 



Columbella (Astyris) richthofeni 



Gabb 



Crepidula onyx Sowerby 

 Lunatia, sp. 



About two miles north of Anticline Ridge and six hundred feet 

 stratigraphically above the Glyeymeris zone occurs another zone char- 

 acterized by a great abundance of a thin variety of Eckinarachnius 

 gibbsii Remond. The fossils are found in a bed of yellowish, sandy 

 clay which is only a short distance above the highest vivianitic sand- 

 stone that occurs at this locality. This seems to correspond to the 

 Lower Middle zone of the Etchegoin as mapped by Arnold and 

 Anderson in the southern part of the district. The following species 

 have been found at this horizon : 



Crepidula onyx Sowerby Mytilus, of. edulis Linne 



Cryptomya quadrata Arnold Mytilus coalingensis Arnold 



Echinarachnius gibbsii Remond, Olivella biplicata Conrad 



Metis alta Conrad 



A few hundred feet above the zone last described another zone was 

 found with vertebrate material at the same locality. The invertebrate 

 material, being in a very poor state of preservation, could not be 

 identified except as follows : 



Area trilineata Conrad Neverita, sp. 



Macoma, sp. Pecten, sp. 



Mytilus, sp. 



About one hundred feet below the Mya japonica zone near the 

 anticline a band of white shale occurs in which are found a large 

 number of fragments of Pecten nutteri Arnold. The presence of this 

 species and its stratigraphic position seem to place this as the equiva- 

 lent of the Upper Middle beds, or the Pecten coalingensis zone south of 

 Coalinga. The following species were collected : 



Area trilineata Conrad Cancer 

 Calyptraea filosa Gabb Fish vertebrae 



Pecten nutteri Arnold 



thin variety. 

 Lunatia, sp. 



Macoma inquinata Deshayes 



Saxidomus nuttalli Conrad 

 Sehizothaerus nuttalli Conrad 

 Solen, sp. 



