Geol.— Vol. II.] ANDERSON— STRATIGRAPHIC STUDY 1 77 



fornia Limited Oil Company is the rather local development 

 of heavy beds of conglomerate. These are best seen in the 

 " Rainbow beds" on Sec. 4 and 10 ; T. 19 S., R. 15 E. and 

 in the conglomerates crossing Salt Creek, Sec. 10, 11, and 

 14; T. 18 S., R. 13 E. 



These conglomerates vary considerably in thickness, having 

 their maximum development on Salt Creek, where there are 

 above the Reef Beds about twelve hundred feet of heavy 

 serpentine conglomerate. The conglomerates, including the 

 " Rainbow beds," lie between the Reef Bed below and the 

 Tamiosoma bed above, and as far as they have been followed 

 they hold this relation, but at intervals give place to sandy 

 beds, as in the case south and west of the California Limited 

 Oil Company's wells. 



West of Coalinga the Reef Bed is not a prominent topo- 

 graphic feature, but it can be recognized by its faunal con- 

 tents, which contains the following species: 



*Dosinia ponderosa Gabb Pecten estrellanus Conrad 



"^Cyrefta calif ornica Gabb Zirphaea dentata Gabb 



Crepidiila excavata (?) *Mactra {Spisula) catilliformis 



*Cytherea {CalHsta) sp. (rel. C. Dall 



callosa) *Mactra {Spisula) falcata Gould 



Mytilus californianiis Conrad *Neverita recluziana Desh. 



Lucina borealis Linn. *Chrysodomus recunia Gabb 



*Metis {Lutricola) alia Conrad Purpura sp. 



Maconia nasuta Cpr. Galerus sp. 



Cytherea ( CalHsta) diabloensis Cancellaria vesper Una n. sp. 



n. sp. Nassa sp. 



* Tapes tenerriina Cpr. *Trophott sp. 

 Diplodonta harfordi n. sp. *Astrodapsis sp. 



* Pecten discus Conrad 



i Oxyrhina tumula Agz. 



Vertebrates ^ Lantna clavata Agz. 

 r Zyg abates sp. Agz. 



It is not unlikely, and is perhaps even probable, that the 

 Coalinga Beds as here described will be found to be the 

 equivalent of the Contra Costa Beds described by Merriam^ 

 as belonging to the uppermost Miocene. Their noncon- 

 formity' with both the Monterey Shales below and the char- 

 acteristic Etchegoin Beds above is clearly shown, as pointed 



Bull. Dept. Geol. Univ. Calif, v. 3, no. 16. 



