Cheyenru Sandstone of Kansas. — Cragin. 25 
parently reached in Kiowa county, south of the Medicine river. 
In the high bluffs of Bluff creek, below Vanhem, it measures 
nearly as much. At many localities it ranges between GO and loo 
feet. North and east of the Medicine river it becomes thinner. 
In portions of Kingman, Harper, Barber, Comanche and Clark 
counties, the Neocomian has been entirely eroded from areas where 
its former presence is attested by numerous specimens of Gryphcea 
pitcheri and a small Gryphcea which is perhaps distinct from the 
latter and fragments of characteristic shell-breccia. North of 
Sharon both of these forms of Gryphcea are included abundantly 
in the Loup Fork conglomerate, together with shell-breccia and 
fragments from the Chej-enne and Triassic sandstones, showing 
the working over of the Mesozoic r<|pks by the Tertiary lake 
waters. 
The dip of the Neocomian series, as a whole, like that of the 
Cheyenne Sandstone, is eastward and southward. Individual 
strata are subject to considerable undulation, and may dip for a 
short distance in any direction. 
In Kansas, the Fredericksburg shales rest everywhere upon the 
Cheyenne sandstone or upon the Triassic red-beds, with the possi- 
ble (but, I think, improbable) exception of one or two localities 
in McPherson and adjoining counties, where the absence of. 
Cheyenne sediments from beneath a part of the Fredericksburg 
may, at some point, bring the latter directly upon the Permian 
shales and limestone. 
The sections given below will afford an adequate idea of the 
prevailing character and local variation of the Neocomian of 
southern Kansas, and of its relations to older and more recent 
formations : 
BELVEDERE SECTION. 
No. 
A.PFROX. 
Thickness 
IN FEET. 
•_T)— :?o 
Description. 
Top 
of 
hill. 
(This horizon overlaid in neighboring nights with Tertiary 
conglomerate.) 
1 
Light olive-brown or yellowish-brown earthy shale, with nu- 
merous layers of glossy, purple-red Ostrea franklini breccia, 
in w hich large specimens of Gryphsea pitcheri arc imbedded. 
I 
4(1- .".0 
Same as No. l (from which it is elsewhere not separable, and 
here not sharply so), but with additional thin layers of brown- 
yellowish calcareous sandstone, which arc. in pari barren, in 
pari charged with valves <>f two or three small undetermined 
species of bivalve mollusks, and sometimes with Ostrea 
franklini. 
