1916] Nomland: Invertebrate Zones of Jacalitos and Etchegoin 85 



Section Showing Stratigraphic Position of In 

 Faunal Zones in the Jacalitos and Etchegoin 



vertebrate and vertebrate 

 Formations near Coalinga 



Tulare 



Etchegoin 

 1300 feet 



Jacalitos 

 1700 feet 



Santa 

 Margarita 



Mya Zone 



Upper Middle 

 Zone 



Lower Middle 

 Zone 



Glycymeris 

 Zone 



Shale, gypsum, tuff, 

 clays. 



Yellow clays 



Cross -bedded viv- 

 ianitic sandstone, 

 clays, conglomer- 

 ate. 



Unconformity. 



Yellow clays. 



Vivianitic sand- 

 stone, clays. 



Colored clays 

 sands. 



Conglomerate. 

 'Bed beds." 

 Unconformity 



Occurrence of Equus or Plio- 

 hippus, mastodon, camels, 

 etc. 



Pliohippus coalingensis 

 (Merriam). 



Pliohippus? 



Neohipparion molle Merriam. 



Description op New Species 

 CALLIOSTOMA ETCHEGOINENSIS, n. sp. 

 Plate 7, figure 3 



Type from University of California locality 2096 in the Etchegoin formation, 

 northeast of Oilfields, California. 



Shell conical, apex subacute. Whorls about five, with nearly 

 straight sides, the angle of body-whorl very sharp and base flattish. 

 The sculpture on the sides of the whorls consists of three or four 

 revolving ridges, the bottom one being the smallest, and fine inter- 

 calaries between each pair of the upper two or three ; the upper 



