12 The America?i Geologist. January, igoo 
Comanche and Dakota Cretaceous may be studied. The first 
of these, which is located in the southwestern part of the state 
in Barber, Comanche, Kiowa and Clark counties, naturally 
divides itself into two localities, viz :i the Belvidere locality 
and the Clark county locality. The second region, which is 
situated in Saline and McPherso^i counties a little east of the 
center of the state and from one hundred to one hundred and 
fifty miles north-east of the first named region, may also be 
divided into two localities. The Mentor Beds and the Mar- 
quette locality. 
That these four localities are very similar as regards 
paleontology and show considerable of stratigraphical simi- 
larity will be demonstrated in this paper. They are in all 
places underlaid by the Permian shales and Red-beds, and cov- 
ered with post-Cretaceous (Tertiary or Pleistocene) deposits, 
except the Mentor beds which grade upward into the Dakota 
which in turn is overlaid by the Benton. 
B. The Belvidere-Clark County Region, 
I. The Belvidere Localit)'. 
a. Description and History. 
The published articles of such geologists as Cragin, Hay, 
Snow, Williston, Hill, Prosser, Vaughan and Ward have made 
the geological world familiar with this region. It is safe to 
say that no region of equal area in the state has been more 
thoroughly studied or yielded more satisfactory results. A 
very comprehensive resume of the literature up to 1896 has 
already been given by professor Prosser.* To this the reader 
is referred for details. Suffice it here to say that professor 
Cragin in 1885! described the Black hill horizon west of Sun 
City, and referred the rocks to the Benton, and the next year 
to the Benton and Dakota.t Mr. St. John§ and professor Hay|| 
considered them Dakota. In 1889 professor Cragin published 
a .section of a hill near Belvidere and assigned to the rocks their 
*Uni. Geol. Sur. of Kansas, vol. II, pp. 96-1 11, 1897. 
jBulletin Washburn College Laboratory of Natural History, vol. I, 
])p. 85-91, 1885. 
^bid., vol. I, p. 166. 
§5th Annual Report Kans. St. Bd. of Agriculture, pp. I43-I44- 
]!Tr. Kans. Academy of Science, vol. X, p. 22, 1887. 
