80 University of Kansas Geological Survey. 
boundary is represented as extending irregularly southwesterly 
from Reno across Kingman, Pratt, Barber, Kiowa, Comanche, Clark 
and Meade counties to the state line. 
On the small geologic map of Kansas published by Doctor Wil- 
liston in 1892 the Red-Beds are called Triassic, and their eastern 
line is represented as extending from the Arkansas river southeast- 
erly across Reno, Kingman and Sumner counties. The northwest- 
ern boundary extends southwesterly from the Arkansas river across" 
Reno, Kingman, Pratt, Barber, Comanche and Clark counties to 
the state line. 
in 1893 Professor Hay changed his correlation of the Red-Beds 
from the Triassic to the Upper Permian of Kansas and assigned 
them a thickness of 900 feet. This change in correlation was due 
to the discovery of fossils in northern Texas in strata which were 
regarded as of the same general age as those of Kansas. Professor 
Hay said “The Texas geologists have considered the similar beds 
there as of Permian age; and Professor Cope, of Philadelphia, has 
shown me undoubted Permian fossils obtained from the Texas beds. 
This has led me to place them in the geological scheme as Per- 
mian. Still, in the Kansas beds no fossils have yet been found2.” 
On the geologic map compiled by Mr. McGee, the Red-Beds are 
correlated with the Jura-Trias, and represented on the map as ex- 
tending from northern Texas across Oklahoma into southern 
Kansas’. | 
Professor Cope, who has thoroughly studied the vertebrate 
fossils of Texas visited in 18938 the Red-Bds of northern Okla- 
homa and southern Kansas. On account of the close connection 
existing between them, his statements in reference to their age are 
of great importance in correlating the Kansas terrane. He said 
“Our first object was to examine the red bluffs of Permian or Trias, 
which bound the canyons north and northwest of the post [Fort 
Supply in county “N” northern part of Oklahoma], which form 
part of the drainage system of the Cimarron. These bluffs we ex- 
1 Robt. Hay, Eighth Biennial Report Kansas State Board Agriculture, pt. II., 
p. 101. 
2 Ibid., p. 108. 
3 Fourteenth Annual Report U. S. Geological Survey, pt. II., 1894, pl. II. Wash- 
ington. 
