20 



HAEHL AND ARNOLD — THE MIOCENE DIABASE. 



[Feb. 



List of Vaquero {Lower Miocene) Fossils. 

 (*) are characteristic, so far as known. — 



-Those marked with a 



^Agaso?na barkerianum Cooper 

 '^Agasoma gravida Gabb 

 ^Agasojna kernianmti Cooper 



* Area tnicrodonta Conrad 

 Balanus estrellanus Conrad 



'^ Cardium {Trachycardiiwi) n. 

 sp. A. 



* Chione mathewsonii Gabb j 

 Chione n. sp. A. (very large) 



* Conus n. sp. A. 

 Crepidula grandis Midd. 



* Cuma biplicata Gabb 

 "^Dosinia conradi Gabb 



Dosinia inathewsonii Gabb 



'^Dosinia cf. montana Conrad 



Dosinia aff. ponderosa Gray 



* Galeocerdo prod^lctus Agassi z ^ 

 Galerus cf. excentricus Gabb 



"^ Glycynieris n. sp. A. (very 



large) 

 "^Lamna clavata Agassiz 

 Lucina acutilifieata Conrad 



Lticina richthofeni Gabb 

 Mytilus mathewsonii Gabb 

 Neverita recluziana Petit 

 Ostrea titan Conrad 

 Panopea generosa Gould 

 Pec ten estrellanus Conrad 



^Pecten {Chlajnys) n. sp. E. 



^ Pec ten {Lyropecten) magnolia 

 Conrad 

 Pecte?t {Plagiocteniuni) n. sp. E. 



^Periploma n. sp. A. 

 PsanDuobia edentula Gabb 



-^Pyrula (?) sp. A. 



'^ Pinna alamedensis Yates 



^'Sigaretus scopulosus Conrad 

 Solen sicarius Gould 



* Tivela ineziana Conrad 



* Trochita costellata Conrad 



* Turritella hoffmani Gabb 



* Turritella ocoyajia Conrad 



* Yoldia n. sp. aff. cooper i Gabb 



(2) The Monterey Shale. The shales overlying the coarse yellow 

 Vaquero sandstone are in some places thin-bedded, soft and 

 chalky, while in others they are hard, dark colored and somewhat 

 more massive. The white facies of the shale is found overlying the 

 diabase tuff in the region just west of the Langley Hill-Mindego 

 Hill igneous area, while the dark colored facies is found on the 

 northeast slope of the main ridge between the summit and Corte 

 de Madera Creek. These shales represent at least a part of the 

 Monterey series, which is supposed to be of middle Miocene 

 age. The upper part of the Vaquero sandstone series, at least that 

 part showing alternating beds of sandstone and shale with a ten- 

 dency to grade from the sandstone vertically upward into the shale, 

 may be the inshore equivalent of some of the Monterey shale 

 found at the typical locality in the region around Monterey. This 



