212 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



These stream terraces, well developed in some localities, dis- 

 play a considerable range in elevation and are the results of 

 stream action and of oscillations which operated through long 

 periods of time, extending back into Pleistocene and possibly 

 late Pliocene time. 



Tulare 



Excepting the superficial deposits, the uppermost formation 

 exposed in this area is a fresh water terrane which may ht 

 correlated with the Tulare. The Tulare was named by Mr. 

 F. M. Anderson in his paper entitled "A Stratigraphic Study 

 of the Mount Diablo Range in California,"* but was previously 

 described by W. L. Watts.* 



These beds at McKittrick, Midway and Sunset are de- 

 scribed by Dr. Ralph Arnold as a portion of the McKittrick 

 series which he acknowledges may be in part Tulare. 



In the South-End McKittrick field the Tulare is composed 

 of from 1250 to 1800 feet of loosely consolidated sands, clays, 

 marls and conglomerates or fragmental shale beds exposed on 

 both sides of an anticlinal fold and separated in part by the 

 small valley previously mentioned. The whole mass is light 

 colored, varying from yellowish gray to drab and is easily 

 eroded, forming steep sided gulches. 



In the upper division there are considerable quantities of 

 sand and fragmental shale beds with minor strata of clay. 

 The fragmental, shale beds are in a way unique. They are 

 made up in some instances wholly of small angular and sub- 

 angular shale fragments derived from the underlying shale 

 formations. All the facies of shale common to the Santa 

 Margarita and Monterey of the adjacent areas are found 

 mingled with comparatively little sand as if, in Tulare time, 

 these beds were formed by a rapid denudation of the nearby 

 shale areas. 



The lower part of the Tulare is, in a general way, made up 

 of finer sediments than the upper, containing considerable clay 

 and marl. A little conglomerate, of which the boulders and 

 pebbles are mostly well rounded old crystallines and hard 

 sandstones, is found near the base. Some of the clay is gyps- 



»Proc. Calif. Acad. Sci. Geol., Vol. 2, 1905, No. 12. 

 * Calif. State Mining Bur., No. 3, 1894. 



