32 E. T. DUMBLE 
3. Upper chocolate shales, comprising bluish shales at top, 
grading down into chocolate or brown shales which wea- 
ther to clays. 
These rest upon other chocolate shales which become 
sandier toward bottom. ‘These shales vary in thickness 
2. Yellow sand and conglomerate. 
Bluish sandy shales and thin sandstone, variable in thick- 
Massive yellow sandstone with large dark brown segrega- 
tions and concretions and some layers of bluish sandy shale 
Fine sand with local beds of conglomerate interbedded 
with blue and brown shales; a considerable amount of 
glauconitic-matenalat basemen era eee 
1. Lower chocolate shales. 
Beds of chocolate and brown shale with small ferruginous 
and limy concretions and layers of glauconitic sand... 
300 
2,700 
Mr. Anderson reports the following forms collected from the 
top of the lower chocolate shales at a locality on Salt Creek in the 
SW + of NW 3 Section 25, Twp. 18 S., R. 14 E.: 
Corbula horni Gabb 
Meretrix fragilis Gabb 
Leda gabbi Conrad 
Margaritella angulata? Gabb 
Helicaulax costata Gabb 
Ataphrus crassus ? Gabb 
Neverita globosa Gabb 
Arca horni Gabb 
Architectonica horni Gabb 
Rimella canalifera Gabb 
Bulla horni Gabb 
Nucula truncata Gabb 
Modiola ornata Gabb 
Pectunculus sp. 
Discohelix californica Weaver 
Turritella pachecoensis Stanton 
Cucullea matthewsoni Gabb 
Arca biloba Weaver 
Dentalium sp. 
Cylichna costata Gabb 
Barbatia morsei Gabb 
Spiroglyphus tejonensis Arnold 
Pleurotoma fresnoensis Arnold 
Corbula paralis Gabb 
Venericardia alticosta Gabb 
Numulites 
Shark teeth 
