36 Crandall — Santa Clara Valley Region in California. 



The Gastropods, Aucella and Inoceramus came from a cal- 

 careous nodule, one-third of a mile north of the locality where 

 the Belemnites were found. 



There was found, just north of the serpentine, a fragment 

 of wood of the genus Cupressinozcylon, the ancestor of the 

 sequoias. Near this locality an Aucella was collected.* 



From the Cretaceous above the Aucella Piochi beds of Mt. 

 Diablo there have been collected the following forms, at a 

 locality southwest of the mountain : 



List of Horsetown Fossils. 



Chione various Gabb 

 Oucullaea truncata Gabb 

 Trigonia aequicostata Gabb 

 Lytoceras Batesi Trask 



List of Chico Fossils. 



Ancanthoceras Turneri White 

 Anchura californica Gabb 

 Baculites chicoensis Trask 

 Dentalium Cooper i Gabb 

 Dentalium stramineum Gabb 

 Eriphyla umbonata Gabb 

 Mactra tenuissima Gabb 

 Meretrix nitida Gabb 

 Nautilus sp. 



Pa chy discus suciaensis Meek 

 Pecten operculiformis Gabb 

 Pinna Breweri Gabb 

 Schluteria diablbensis Anderson 

 Scobinella Dilleri White 

 Trigonia evansana Meek 

 Cardium, anmdatum Gabb 



The range of the following species is through Horsetown and 

 Chico epochs : 



Chione varians 

 Cucullaea truncata 

 Eriphyla umbonata 

 Pecten operculiformis 

 Trigonia evansana 



These five forms are known to have been found in the Horse- 

 town at other places. One of the species, Lytoceras Palest, 

 is a characteristic Horsetown form. This is hardly enough 

 faunal evidence to prove the presence of Horsetown beds at 

 Mt. Diablo, but argument will be offered later to show the 

 probability of the presence of this horizon at this place. 



*H. W. Turner, Geology of Mt. Diablo, Bull. Geol. Soc. Am., ii, 394. 



