ST. JOHN. | WIND RIVER RANGE—CAMPBELL’S FORK CANON. 241 
origin, forming along, irregular lake, or chain of lakes, perhaps a couple 
of miles in length, nestled between high, steep bluffs, crowned by mo- 
rainal materials. A mile above the lake, or just within the entrance to 
the canon, the stream has for a short distance tunneled the Carbonifer- 
ous limestone that here spans the bed of the cation perhaps 50 feet above 
the present water-level in the subterranean passage. Above this smaller 
lake expansions occur, much silted up from the deposition of sediment. 
The section revealed in the lower portion of the cafion includes the 
complete series of Paleozoic formations. The Primordial horizons, in- 
cluding the Potsdam quartzitic sandstones and Quebec limestones, are in 
the main concealed beneath the accumulations of débris in the taluses, so 
that the exposed portion of the cafion walls are entirely formed by the 
Carboniferous limestones. Towards the exit, however, the great sand- 
stone horizon forming the middle division of the Carboniferous appears 
in the cafion walls, and rising well up on the mountain flank, where it 
forms a well-marked topographic feature. The sandstone is succeeded 
by the limestone and shaly Permo-Carboniferous deposits, which, how- 
ever, are much obscured by débris. To the latter succeed the Triassic 
“red beds,” upon which rests an unconformable series of soft, dirty yel- 
low and drab Tertiary sandstones that appear in the bluffs bordering 
the course of the stream for a couple of miles below the caiion. 
The geological section, of which a diagram illustration has been pre- 
pared, consists of the following members at this locality, the thickness 
of the various beds being roughly estimated : 
Section in Campbells Fork Cation. 
No. 1. Archzan. . 
No. 2. Potsdam quartzitic sandstones. 
No. 3. Drab shaly passage beds. 
No. 4. Quebec; drab, rusty-weathered, even-bedded limestones. 
No. 5. Buff, reddish-stained limestone, 300 feet +. Carboniferous. 
No. 6. Grayish-buff heavy-bedded magnesian limestone, 300 feet +. 
No. 7. Buff-drab limestone, magnesian below, with a conspicuous red 
band above, 200 feet +. 
No. 8. Drab cherty limestone,with reddish shaly limestones and clays, 
400 feet +. Contains Syringopora. 
No. 9. Generally buff sandstones, 200 to 400 feet. 
No. 10. Limestones and shales, Permo-Carboniferous, 200 feet +. 
No. 11. Trias. Red sandstone and arenaceous clays. 
No. 12. Tertiary. Dirty buff and drab sandstones and clays, uncon- 
formably overlying the Triassic, and dipping slightly down stream or 
northeastward. 
No. 18. Morainal deposits. 
Between Torrey’s Creek and Campbell’s Fork the outlying bench at 
the foot of the mountain shows a low bulging area which is denuded to 
the Trias over the greater portion of its extent, in which the dips after 
leaving the spring of the mountain flank are generally quite moderate. 
But in the narrow area lying immediately along the left side of Wind 
River the strata are more sharply inclined, in places at an angle of 50° 
or 60°. In the latter quarter, or in the immediate vicinity of the 
confluence of North Fork of Wind River, the section displayed in the 
abrupt barren bluff slopes is made up of the variegated and buff 
sandstone deposits of the inter-Jura-Trias horizon, and above occurs a 
considerable thickness, probably amounting to a few hundred feet, of 
beautifully variegated clays, rusty sandstones, and bands of limestone 
16H 
