U. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE IX 



A. COLUMNAR SANDSTONES, TOP OF LEVEL XJINTA A, WHITE RIVER CANYON, UINTA BASIN, UTAH 

 (After Riggs, 1912.1.) Field Mus. negative 



B. PANORAMIC VIEW, WHITE RIVER CANYON, 4 MILES BELOW WAGONHOUND BEND, UINTA BASIN, UTAH 

 Bluffs on right bank of river belong to the unfossiliferous level Uinta A. Photograph by Riggs. Field Mus. negative 



MIDDLE EOCENE OF NORTHERN UTAH (LEVEL UINTA A) 



