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University of California Publications in Geology [Vol. 8 



In making our comparisons between faunas, the condition of 

 deposition should be stated. The fauna of the uppermost Martinez 

 flourished in moderately deep water while that of the basal Tejon is 

 littoral. Luckily we do have a moderately deep-water fauna contained 

 in the Tejon beds just overlying the basal beds. These beds south 

 of Mount Diablo are about fifty to seventy-five feet thick and they 

 have yielded Schizaster lecontei, Pecten interradiatus and several 

 species of foraminifers. They are in turn succeeded by Turritella 

 uvasana- beds which yield a typical Tejon fauna of the inshore type. 

 These last mentioned horizons are represented at the type section of 

 the Martinez by fossiliferous beds. The Turritella uvasana beds near 

 Muir Station contain a typical Tejon fauna, but the shales and 

 glauconitic sands beneath have yielded a fauna which was so unusual 

 for the Tejon that Dr. Weaver included it in the Martinez. This 



fauna is as follows : 



Loc. Loc. Loc. 



215 337 532 



Nummuloid( "?), sp x 



Orbitoides, sp x 



Cardium cooperi Gabb x x 



Cassidaria tuberculata (Gabb) x 



Modiolus merriami (Weaver) x 



Leda gabbi Conrad x 



Tellina kornii Gabb x 



Tellina cf. remondii Gabb x 



Tellina martinezensis Weaver x 



Thracia karquinezensis Weaver x x 



Solen parallelus Gabb x 



Solen stantoni Weaver x .... x 



Venericardia planicosta Lamarck x 



Bela cf. clatkrata Gabb x 



Ficopsis remondii Gabb x 



Megistostoma striata Gabb x 



Perissolax, n. sp .... x 



Rimella canalifera Gabb x 



Spiroglypkus( ?) tejonensis Arnold x 



Turris monolifera Cooper x 



Turritella conica Weaver x 



Tritonium eocenicuni Weaver X 



Tritonium impressum Weaver x 



Of these forms Solen parallelus, Venericardia planicosta, Bela 

 clathrata, Ficopsis remondii, Cassidaria tuberculata, Rimella canali- 

 fera, 8piroglyphus( f ) tejonensis, Turris monolifera are typical of the 

 Tejon. No typical Martinez species such as Tellina undulifera, 

 Cucullaea mathewsonii, Urosyca caudata or Brachysphingus liratus 

 have been found in these strata. 



