62 



TITANOTHERES OF ANCIENT WYOMING, DAKOTA, AND NEBRASKA 



Figure 43. — Section of Eocene deposits in the San Juan Basin, northwestern New Mexico (No. 2, 

 fig. 35), showing the base of the Puerco formation resting upon the eroded surface of the Ojo 

 Alamo sandstone, as observed by Sinclair and Granger (1914.1) 



This section displays the close geologic continuity of the Puerco and Torrejon beds, which are subdivided faunistically into four 

 distinct life zones, named, in ascending order, (1) Ecloconus and (2) Poly mastodon zones, Puerco formation; (3) Deltatherium and 

 (4) Fantolambda zones, Torrejon formation. The Ojo Alamo sandstone is perhaps of Judith River age. 



