134 KANSAS ACADEMY OF SCIENCE. 
of ironstone concretions. Rather poorly preserved dicotyledonous leaves are 
found in a few ledges. Other exposures of the sandstone are at Blue Cut mound, 
two and one-half miles south of Belvidere, and on the high hill south of the forks 
of the Medicine river, five miles west of the same place. The sandstone is every- 
where covered unconformably by the Tertiary, and doubtless extends under this 
covering west to Clark county and north to the Arkansas river. 
Aecsar os 3 mb, 
Don dstone |e % Sieg 
Sar, ma ee : 
Greenleas 
Sondstonae : ya =, 
Grertaceous 
S) 
Cheyenne 
U | Sandsione 
F ; 
Wad Beds 
Triassic @) 
PLATE IY. Geological section at Belvidere. 
Clark County Locality.—The general features of the Cretaceous of Clark 
county do not differ from those of Belvidere, except that here the Cheyenne is 
wanting. The base of the Kiowa rests unconformably on the unevenly eroded 
surface of the Red Beds. The fossils and stratigraphy of the Kiowa are very 
similar to the Belvidere locality, with the exception that in Clark county there is 
usually a greater proportion of arenaceous shale in the upper layers. The Kiowa 
grades upward through the more or less pronounced transition beds into the 
typical dark-brown and black Dakota sandstone. The outcrops of the Dakota 
occur in a line from northeast to southwest for a distance of twenty miles, from 
Bluff creek, ten miles north of Ashland, across the head of Hackberry, East 
Bear, West Bear, Chatman, Big Sand, and Kiger creeks, as far as the Little 
Basin, in the western part of the county. These creeks cut the line of outcrops 
nearly at right angles. Professor Cragin reported forty feet of dark-brown sand- 
stone from the head of West Bear creek. At the same place Professor Prosser 
measured seventy feet. In 1898 Doctor Ward, Doctor Stanton and the writer 
