A Geological Map of Logan and Gove 
Counties. 
BY GEO. I. ADAMS. 
The accompanying map is published as a record of field work 
done in the summer 1896, while the writer was engaged in investi- 
gating the water supply of the area around Oakley, (see Report of 
Kansas State Board of Irrigation 1896-7, p. 113) and is here pre- 
sented, with the hope, that it may assist in the further mapping 
of the geological formations. The shaded portions of the map are 
as accurate as the scale will permit, the field mapping having 
been referred to section lines or streams. Logan and Gove 
counties are here shown, also the southern row of townships of 
Sheridan and Thomas counties. 
The level plain around Oakley, is a portion of the Tertiary for- 
mation of the western portion of the state. In this area it has a 
thickness of not over 200 feet. The formation consists of clays 
and sand, more or less cemented and mixed with some gravel. It 
has been eroded along the principal streams exposing the under- 
lying formation which is the Cretaceous. : 
Noreweast or unalo Park’ in (Sec. 22) W.. 10; Re,i275-1s *the 
western limit at which the Niobrara is exposed along the Saline. 
There it occupies the immediate valley of the stream. The area 
gradually widens to the east. In the vicinity of Gove the Niobrara 
is shown on the map by the light shading. The outcrops become 
more important to the east, as is indicated by the dotted lines. 
The Niobrara is easily recognized, being the ‘‘chalk”’ formation. 
The area, shown in light shading north of the Smoky Hill river, 
at Russell Springs, is for the most part Fort Pierre. The Niobrara 
is seen in the valley as far west as the vicinity of Russell Springs, 
but occupies a limited belt. The line between the two fermations 
was not traced. The Fort Pierre shales erode quite easily thus 
(9) KAN. UNTV. QUAR., VOL. VII. NO. 1, JAN. 1898, SERIES A. 
