Cheyenne Sandstone of Kansas. — Cragin. 
27 
hillanum Sby. , (?) Gouldia* sp. , Pholadomyu sancta-sahce Roem. , 
Liopistha protexta Con., Homomya alta Roem., Scalaria sp. , ( ?) 
Liihotrochus sp. , and several other genera not 3'et satisfactorily 
determined. No. 5 has also yielded a specimen of coral of the 
family Astrceidce, and several casts of large sigmoid burrows 
(lenzitoid in cross-section), supposed to be those of a Nereid 
worm. 
The Cardntm designated in No. ."J as ('. helviderei is allied 
'{fide Mareou) to the Xeocomian C. cornuelianum D'Orb. 
BLUE CUT MOUND SECTION. 
No. 
Top 
of 
hill. 
Approx. 
Thickness 
IN FEET. 
Description. 
On and about the summit of the mound are scattered a few 
fragments of Loup Fork calcareous sandstone and numerous 
boulders (the largest 5—8 ft. long) of dark-brown Dakota sand- 
stone. 
Upper part with boulders of Dakota sandstone; lower part 
with debris of brown-and-purple-banded, often hollow, concre- 
tions of clay-ironstone, associated with yellow clay-shale. No 
fossils detected. 
20 
10—15 
25—30 
Greenish-yellow clay-shale with plates of light, yellowish - 
brown to rust-colored sandstone having clay-ironstone concre- 
tion-roughened faces; both clay and stone containing very large 
Gryphsea pitcheri. Ostrea franklini also appears sparingly in 
the lower part. 
( )live-grey or olive-brown to yellow or buff earthy (day-shales 
with numerous thin strata of Ostrea franklini breccia, contain- 
ing some mostly rather large specimens of Gryphsea pitcheri. 
( Supposed equivalent of No. 1 of the Belvklere Section.) 
Forming upper third of the east face of the "Blue Cut." 
Similar to No. 3 lithologically, but graduating below into the 
dark si i ale of No. 5. . 
Lower two-thirds of east face of "Blue Cut." Dark slate- 
colored or bluish-black shales with bands of shell-conglomerate, 
the shale containing, in the lower part most abundantly: 
Cyprimeria crassa, Turritella marnochii, var., belviderei } Car- 
dium, kansasense, Leptosolen belviderei. Ammonites helviderei, 
Ammonites acuto-carinatus, Exogyra flabellata, Gryphsea 
pitcheri, and Ostrea franklini,— the latter, with some Gr. 
pitcheri and an occasional Exog. flabellata, making up several 
stony layers of shell-conglomerate three to ten inches in thick- 
ness. 
.Most characteristic of No. 5 are several small forms of 
Gryphcen ranging from an inch loan inch and a half in bight. 
•One of the commonest of these, save Cor the characteristic sulcus 
seen on thi' posterior slope, hears striking resemblance to the 
Jurassic G. arcuata (incurva). This feature, however, belongs 
especially to G. pitcheri. Such n combination of characters in 
one variety perhaps points to the origin of the latter species from 
*The interior features of this very common shell are obscured in the 
specimens thus far collected. Prof. Mareou thinks it an Astarte. 
