M.JOHS.] JURASSIC STEATA — HIGHAM'S PEAK. 335 



parently underlaid by red sandstones, the dSlris of which was seen in the 

 surface'of an adjacent eminence, a few hundred yards northeast. One 

 and a half miles or thereabouts to the southeast of the limestone bluffs, 

 a heavy deposit of red, even-bedded, ripple-marked sandstone makes up 

 the bulk of a large hill a few hundred yards to the northwest of and par- 

 allel with the comb of Station IV. These sandstones dip at an angle of 

 45°, X. 25° E. ; bed d. The sag intervening between this and Station 

 TV ridge is eroded out of a softer, deep-red arenaceous bed (bed e), which, 

 together with the sandstone, bears a marked resemblance to the Trias- 

 sic, as elsewhere developed hi the district. 



Station IV occupies the summit of a rough-weathered comb, composed 

 of a heavy bed of coarse, red sandstone alternating with conglomerate, 

 all of which is more or less changed to the condition of a quartzite; bed/. 

 This ledge dips 45°, 3sT. 15° E., and it may be traced a distance of a mile 

 or two along an east- west course ; the outcrop in the west spur being 

 distinctly visible from Fort Hall, and which forms a higher parallel 

 ridge with the Jurassic-capped ridge north side of Lincoln Creek. In 

 crossing from Station TV to the latter ridge, a mile or so southwest, the 

 upland revealed a single exposure of gray limestone about two-thirds 

 the way across, when we come to the northeasterly-dipping, rusty 

 weathered gritty Jurassic limestone which caps the Lyncoln Valley 

 ridge two to three miles northeast of Station III. 



The strata above noticed are observed to swerve round in strike, the 

 sandstones in the border-slopes between Station IV and Fort Hall hav- 

 ing a trend almost at right angles to the beds in the station and neigh- 

 boring ridges, which latter evidently belong to the uplift of Station III 

 ridge ; while the soft border sandstones show evidence of much complica- 

 tion, at one place the inclination changing from that above noticed, 20° 

 southward, to ST. 25° E., at an angle of 55° to 60°. 



Four miles to the northward of Station IV, on the culminating point 

 of a very similar ridge known as Higham's Peak, Station V was located, 

 at an altitude of about 6,600 feet above the sea, or a couple of hundred 

 feet lower than the former station. Approaching this ridge from Fort 

 Hall in a northeasterly direction, the first two miles passes over the 

 gently-rising bench which outlies the foot-hills. The first rock here met 

 with is a heavy bed of drab-gray limestone interlaminated with shales and 

 light-drab laminated limestone with obscure traces of fossils, showing 

 a thickness of perhaps 30 feet, dipping southwestwardly at an angle 

 of 25° to 45°. The rock closely resembles the limestone noticed in the 

 gorge a couple of miles northwest of Station IV, with which it is be- 

 lieved to be identical. One hundred yards northeast of the last expo- 

 sure a limited outcrop of thin-bedded red sandstone appears, which holds 

 an inferior stratigraphical position, and dips 25°, W. 50° to 65° K 

 Within a distance of a mile to the northeast of the last a similar red 

 sandstone outcrops in a hill at an elevation of 500 to 600 feet above the 

 limestone exposure, showing an inclination of 37°, W. 25° S. ; and in 

 the saddle a few hundred yards northeast a heavy-bedded, coarse, pink- 

 ish-white, and reddish sandstone dips beneath the foregoing at an angle 

 of 35°, W. Thence a high, undulating, grassy upland with no rock ex- 

 posures is crossed, 1£ to 2 miles, when a deep ravine half a mile south- 

 west of Higham's Peak is reached, where the lower strata consist of 

 limestones affording Carboniferous fossils, succeeded by soft buff and 

 chocolate-red variegated sandstones and sandy shales and heavy ledges 

 of grayish-buff and reddish sandstones and conglomerate, including a 

 layer of cherty limestone with crinoidal remains ; the whole making up 

 a thickness of .'several hundred feet of much-disturbed and apparently 



