HOURNAL OF GEOLOGY 
(VANCARY-FEBRUARY, 1072 
THE PERMO-CARBONIFEROUS OF NORTHERN NEW 
MEXICO 
S. W. WILLISTON 
The University of Chicago 
Ba CaGASE 
The University of Michigan 
The age of the Red Beds of the Rocky Mountain region has 
long been in doubt. They outcrop extensively along the eastern 
foothills, extending across Wyoming from the Laramie Mountains 
to the Wind River Range, thence through eastern Utah and 
western Colorado, with extensive exposures in the southwestern 
part of that state; in various places in northern New Mexico, 
from the San Juan region east; southwestward in the Ft. Wingate 
region; and along the eastern part of the same state. On the 
plains are extensive outcroppings in southwestern Kansas, thence 
across Oklahoma into the northern and western parts of Texas. 
Vertebrate fossils of Triassic age have been reported trom the 
Lander region (Williston, Branson), Como and Red Mt. (Reed 
and Williston) in Wyoming; from northeastern Utah (Lucas); 
western Colorado (Cross); northern New Mexico (Cope); Fort 
Wingate, New Mexico (Yale collections, Shufeldt); Pan Handle 
(Cope), and Claremont, Texas (Brown). The fossils, consisting 
chiefly of phytosaurs and labyrinthodonts, agree, for the most part, 
so closely with those of the Keuper of Europe that their horizon 
may be confidently fixed as Upper Trias. Below the horizon yielding 
Vol. XX, No. 1 I 
