80 University of California Publications in Geology [Vol.9 



stone. The texture is uniform in the same members of the beds. 

 Different members may, however, be very different in texture as well 

 as in other characteristics. The lowest beds have a dip of 10° E, the 

 dip becoming slightly less in the upper part of the formation. 



At a short but variable distance above the Glycymeris zone, or 

 lowermost Etchegoin, an unconformity was traced from sec. 1, 

 T. 19 S, R. 15 E, southward to Anticline Ridge, a distance of about 

 seven miles. The beds below could be traced to the beds above, 

 being cut off by the unconformity. At one locality where the beds 

 below the unconformity were composed of hard clay, inclusions of 

 this clay were found in the sandstone above. No difference in dip 

 could be discovered between the beds above and below the irregular 

 contact. Locally the member above has a basal conglomerate as at 

 Anticline Ridge, where it has a thickness of fifteen feet or more and 

 has been used as a gravel pit. A good exposure may be seen at sec. 1, 

 T. 19 S, R. 15 E, where a fault block has brought into view the un- 

 conformity but not the fossiliferous zone beneath. As seen by the 

 description given, this unconformity may be of only local importance. 

 This also seems to be shown by the finding of the same species of horse 

 both above and below. 



Beginning a short distance above the basal beds and continuing 

 upwards for several hundred feet a striking characteristic cross- 

 bedding has its maximum development. These beds are made up 

 almost entirely of a coarse-grained vivianitic sandstone. The cross- 

 bedded members are as a rule abruptly cut off both above and below 

 by clay strata or beds of conglomerate which have a dip of 10° E. 

 Except that the material of which the cross-bedded sandstones are 

 composed seems to become progressively finer in the upper portion, 

 these beds seem to have been deposited under conditions somewhat- 

 similar to those under which the parallel stratified beds beneath were 

 deposited. The beds below contain marine fossils. 



In going upward from the basal Etchegoin beds no member could 

 be followed along the strike continuously over one or two miles until 

 thirteen hundred feet above the base. At that position occur two 

 bands of a white ashy shale mixed in some places with a fine white 

 sand. The fossils found in the upper of these bands show that this 

 corresponds to the Mya zone of the uppermost Etchegoin in the 

 Kettleman Hills and the Kreyenhagen Hills as described by Arnold 

 and Anderson. This zone was traced for eight or nine miles as a low 



