86 



University of California Publications in Geology [VOL. 8 



REVISED LIST OF SPECIES OF SOLEN STANTONI ZONE (Continued} 



Loc. Loc. 

 213-501 541 



Loc. 

 1828 



Listed by 

 Weaver 



Meretrix, sp 



Modiolus ornatus (Gabb) x 



Modiolus merriami (Weaver) .... .... X 



Nucula (Acila) truncata Gabb .... .... x 



Pholadomya nasuta Gabb .... x 



Psammobia(?) cylindrica, n. sp .... x 



Psammobia hornii (Gabb) x 



Solen stantoni Weaver x .... x 



Solen, sp x 



Tellina martinezensis Weaver .... .... y 



Tellina undulifera Gabb x 



Tellina aequalis Gabb x 



Teredo, sp . x 



Ampullina cf. striata Gabb .... .... x 



Architectonica tuberculata Weaver x 



Brachysphingus liratus Gabb x 



Bullinula subglobosa Weaver x 



Cylichna costata Gabb .... x 



Dentalium cooperi Gabb x 



Dentalium stramineum Gabb .... .... x 



Fusus occidentalis Gabb x 



Fusus mathewsonii Gabb x 



Fusus aequilateralis Gabb x 



Heteroterma gabbi Stanton x 



Heteroterma trochoidea Gabb x 



Heteroterma, indet .... .... x 



Lunatia, sp x 



Lunatia hornii Gabb .... x 



Megistostoma(?), sp. Gabb x 



Perissolax tricarnatus Weaver .... .... x 



Siphonalia(?) lineata Stanton x .... x 



Strepsidura pachecoensis Stanton x x 



Tritonium pulchrum Weaver x 



Turritella infragranulata Gabb x 



Turritella pachecoensis Stanton 



Turritella conica Weaver x 



Turris, sp., indet .... .... x 



Urosyca caudata Gabb x 



But one specimen each of Architectonica tuberculata Weaver, 

 Bullinula subglobosa Weaver and Megistostoma(f), sp. Gabb have been 

 found in these upper beds. The number of guide fossils is really very 

 small. Solen stantoni has not been found in the Trochocyathus zitteli 

 zone, but it is reported from the basal beds north of Mount Diablo. 

 Strepsidura pachecoensis Stanton and Turritella conica Weaver appear 

 to be the only others which are restricted to this horizon. The absence 



