aD, REPORT UNITED STATES GEOLOGICAL SURVEY. 
belonging to the Jura proper, and which in turn are unconformably 
overlaid by the pale-red and drab banded Tertiary deposits that a little 
farther back rise up into the general upland level of the basin region. 
The exposures here displayed would doubtless afford interesting and 
valuable data bearing on the detail stratigraphy of that portion of the 
Mesozoic series represented. Such observations as were necessarily 
hastily made at this locality are embodied in an accompanying sketch, 
to which is added a brief explanatory legend of the geological deposits 
shown therein. 
On the south edge of the above-mentioned outlying Mesozoic platform, 
only a short distance from Campbeil’s Fork, the gently inclined Triassic 
‘red beds” are much eroded, the drainage channels having excavated 
shallow picturesque canons on their passage to Wind River. A small 
stream about two miles above Campbell’s Fork, and which rises in the 
outer flank of the great sedimentary border ridge, issues from a deep, 
narrow gorge in the foot of the mountain, where the junction of the 
upper Carboniferous and Triassic deposits is most clearly revealed. 
Below is given a detail section of the upper division of the Carbonifer- 
ous series, including the Permo-Carboniferous horizon at the top, and 
which embraces all the strata at this locality lying between the middle 
Carboniferous sandstone below and the Triassic ‘‘red beds” and con- 
formably associated deposits above. The diagram, in which the above- 
referred-to strata are incorporated, is extended down the cation to the 
northeast and a mile along the left bank of Wind River to the border 
of the Tertiary formations occupying the basin area to the north of that 
stream. 
Section of Permo-Carboniferous horizon, &e., in cation two miles northwest 
of Campbells Fork. 
No. 1. Middle division Carboniferous: Light gray, buff, and reddish 
sandstones, with oblique bedded layers, dip 10° about N. 60° E., and 
rising up on mountain flank at a somewhat steeper angle. 
No. 2. Gray and brownish, in places nodular limestone layers inter- 
bedded with shales, imperfectly exposed 25 feet +. 
No. 3. Unexposed space, 22 feet +. 
No. 4. Gray earthy limestone, exposed 3 feet. : 
No. 5. Unexposed space, 35 feet +. 
No. 6. Hard, bluish-gray limestone, with chert, exposed 15 feet +. 
No. 7. a, gray limestone ledge; 6, indurated nodular calcareous 
shales, filled with Productus, sp.?, recalling P. horridus, &c.; ¢, frag- 
mentary gray, greenish-stained limestone, charged with Productus punc- 
tatus ?, Rhynchonella, Retzia, Spirifer, Syringopora, with Discina in brown 
shaly layers above; all 15 feet +. 
No. 8. Dark drab and brown indurated gritty shales ; numerous indi- 
viduals of a small Nucula (NV. beyrichii ?) are weathered out on surface 
of this horizon, also fragments of Petalodus?; 30 feet +. 
No. 9. a, gray, fragmentary limestone, 2 feet exposed; 5, cherty bed, 
with geodes discolored with bitumen and green stained, also some gyp- 
sum; ¢, fragmentary, grayish-drab limestone, mainly chert above; d, 
gray limestone, green stained, with more or less chert and chalcedony, 
containing crinoidal remains, Fistulipora ?, Cheetetes inaking up a layer, 
Hemipronites, Retzia, Spirifer, Productus, &c.; all 50 feet +. 
No. 10. Gray, gritty, slightly calcareous, indurated argillaceous de- 
posit, with thin sheets of limestone, containing in upper part a small 
Pleurophorus, Schizodus?, Lingula, pyrite crystals and nodules, and thin 
gypsum lamine; 60 to 75 feet +. 
