86 



University of California Publications in Geology [Vol. s 



Revised List of Species of Solen stantoni Zone— (Continued) 



Loc. Loc. Loc. Listed by 

 213-501 541 1828 Weaver 



Meretrix, sp .... x 



Modiolus ornatus (Gabb) x 



Modiolus merriami (Weaver) .... .... x 



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



Pholadomya nasuta Gabb .... x 



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



Psammobia hornii (Gabb) x 



Solen stantoni Weaver x .... x 



Solen, sp x 



Tellina martinezensis Weaver .... .... x 



Tellina undulifera Gabb x 



Tellina aequalis Gabb x 



Teredo, sp .... x 



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



Architeetoniea tuberculata Weaver x 



Brachysphingus liratus Gabb x 



Bullinula subglobosa Weaver x 



Cylichna costata Gabb .... x 



Dentalium cooperi Gabb x 



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



Fusus oceidentalis Gabb x 



Fusus mathewsonii Gabb x 



Fusus aequilateralis Gabb x 



Ileteroterma gabbi Stanton x 



Heteroterma trochoidea Gabb x 



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



Lunatia, sp x 



Lunatia hornii Gabb .... x 



Megistostoma(?), sp. Gabb x 



Perissolax triearnatus Weaver .... .... x 



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



Strepsidura pachecoensis Stanton x x 



Tritonium pulchrum Weaver x 



Turritella infragranulata Gabb x 



Turritella pachecoensis Stanton .... x 



Turritella conica Weaver x 



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



Urosyca caudata Gabb x 



But one specimen each of Architeetoniea 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 



