26 
The American Geologist. 
-hill. 1891 
BELVIDERE SECTION. Continued. 
No. 
Al'PROX. 
! 
IN PEET. 
:;.--40 
15 -20 
Description. 
Shales similar to those Qf Nos. 1 and 2, but becoming darker 
below and thus imperceptibly grading into the upper part of 
those, of No. 4; intercalated throughout with bands of hard, 
arenaceous, yellow limestone ; the latter usually charged heav- 
ily with molluscan-shells, among which. Cyprimeria erassa, 
Cardium kansasense, Ostrea franklini, Turritella marnochii, 
var. belviderei, and an Anchura allied to A. ruida are the most 
abundant. 
Dark, slate-colored, carbonaceous shale, weathering into 
scale-like chips, with occasional yellow and brown streaks, often 
impregnated with sulphuric acid and charged with beautiful 
radiate and rhomboidal selenite crystals, with occasional bands 
of dark, arenaceous limestone (sometimes compact sandstone ) 
containing fossils apparently identical with some in No. 3 and 
thin hands of lignite. 
20—40 
7 
A gray shell-conglomerate composed mostly of molluscan — in 
part, of other invertebrate— fossils of many species. Gryphsea 
vars., ExogyraAabeUata, Trigonia emoryi, Idonearca vulgaris, 
Cardium oelviaerei, Vvprimeria gradata, Turritella marnochii, 
Ammonites acuto-carinatus, A. pedernalis, and a tSerpula, like 
>. intrica, are some of the more abundant forms. 
The ( heyenne sandstone.— Obliquely laminated, mostly inco- 
herent sandstone, commonly grey, or grey and yellow, but often 
gorgeously decorated with crimson, purple, scarlet, orange, 
yellow, brown and other colors. Sometimes impregnated with 
sulphur i chiefly in the upper part i. which often incrusts its ex- 
posures with a yellow " blossom." It contains fragments and 
bands of lignite, and silicified cycads and conifers. 
Fine. soft, brick-red sandstone, marlstone, and shale, forming 
here the summit of the pre-Cretaceous " red-beds," and of sup- 
posed Triassic age. 
Besides the more characteristic species above noted, the follow- 
ing are the forms thus far found in Xo. 3 of the Belvidere Section : 
Grypha>a pitcheri* Mort. , same, var. fomiculata White, Neiihea 
quinquecostata Shy.. ( ? ) Plicatula arenaria Mk., Inoceramus sp. . 
Limopsis sp. , (?) Nucula sp. . Remomdia ferrissii Cragin, Trigonia 
emoryi Con., Cardium sp. (quite distinct from the abundant G 
kansasense (Mk.,) Cyprina ovata M. cc H. . Pholadomya (?) 
elegans, I ?) Mactraap., (?) Globieoncha elevata Slium.. Neri- 
tina sp., Turritella marcochii White (typical). Ammonites acuto- 
carinatus, and a number of forms of undetermined genera. 
Similarly in No. 5, occur the following forms, in addition to 
those above given : Ostrea diluviana L., Anomia tellinoides Mort. , 
A. argentaria Mort.. Neithea quinquecostata Sly.. Pinna sp. . 
Gervillea sp. ( allied to G. anceps Desh.), Modiola burlingtonensis 
Whitf., Limopsis sp. . Idonearca (?) tippana Con., Cardium 
*Of this species two specimens before me differ in no respect, save in 
their more triangular outline from the analogous G. couloniot the Euro- 
pean Neocomian. 
