14 



VERTERRATA OF THE TERTIARY. 



White Kiver of Nebraska is, according to Hayden,* about 150 feet; and on 

 Crow Creek, Colorado, according to King,t 300 feet. Sixty miles east of 

 Crow Creek I estimate its thickness as somewhat greater. The Truckee beds 

 of Oregon have, according to Marsh, a depth of from 3,000 to 4,000 feet, and 

 King estimates the deposit exposed in the Hawsoh Mountains, Nevada, at 

 2,300 feet.J An extensive deposit exposed in the region of the Cajon Pass, 

 Southern California, is suspected by King to belong to the same horizon. 



The followinjr section by Dr. Havden exhibits the strata of both this 

 formation and the overlying Loup Fork epoch, as displayed on the White 

 River, Nebraska. The bed marked E, and those above it, belong to the 

 last-named formation. 



* Proceedings Academy Philada., 18.")", p. l-'iS. 

 tReportof Geol. Survey of 40tli rarnllel, i, 410. 

 JL. c, p. 423; 1. c., p. 415. 



