Vol. VII] GESTER— GEOLOGY McKITTRlCK DISTRICT 209 



rapid developments in 1908. More particularly is he in- 

 debted to Mr. F. M. Anderson, with whom he was associated 

 under Prof. E. T. Dumble of the Southern Pacific Co. for 

 several years. Thanks also are due to Messrs. F. H. Kay, 

 B. L. Cunningham, J. A. Taff, R. W. Pack, E. G. Gaylord, 

 F. B. Tough, and Prof. E. T. Dumble for assistance, infor- 

 mation and criticism. A free use has been made of all publi- 

 cations and maps bearing on this area; the latest and most 

 comprehensive of which are Bull. U. S. G. S. No. 406 by R. 

 Arnold and H. R. Johnson and the topographic sheet of the 

 McKittrick Quadrangle. The latter enlarged to a one-inch 

 scale was found to be very useful. The reader is referred to 

 Bulletin 406, page 15, for a condensed bibliography. 



I. Upper Miocene and Pliocene Deposits of the West 



Side Fields 



location 



The general area under discussion in this paper extends 

 south and southeast from the town of McKittrick, Kern 

 County, California, to the southern end of the developed Mid- 

 way-Sunset field. The accompanying map, enlarged from a 

 portion of the U. S. G. S. topographic sheet of the McKittrick 

 quadrangle, shows the area to which particular reference is 

 made. This is known as the South-End McKittrick Field 

 and was chosen because in this particular locality there are 

 exposed typical fossiliferous sections of the Upper Miocene, 

 Lower Pliocene (Etchegoin) and Pliocene, — fresh water beds 

 usually referred to as the Tulare. This area occupies the 

 southwestern portion of T. 30 S., R. 22 E., M. D. B. & M. 

 The town of McKittrick is located on a branch of the South- 

 ern Pacific R. R. in the northern part of the area. 



TOPOGRAPHY 



The topography of the South-End McKittrick area is 

 similar to that of the lower foothills of the Temblor Range, 

 being the combined result of structural and erosional agencies. 

 Extending southeastward from the McKittrick Oil Field is a 



