332 REPORT UNITED STATES GEOLOGICAL SUEVET. 



4. Gray limestone, containing numerous small Gryplicea. Obscure 

 outcrop at a level of about 130 feet above No. 2. 



5. Slope representing a thickness considerably greater than the differ> 

 ence in level between beds No. 4 and G, probably 100 feet. 



6. Similar gray limestone, with Pscudomonotis, &c. ; dips N. 25° E., at 

 an angle of 26°. Obscure exposure 40 to 60 feet above No. 4. 



7. Slope, 50 to 100 feet. 



8. Yery hard, dark-gray limestone, with small Gryphcca ?, &c, over- 

 laid by a heavy ledge of lighter pinkish-gray limestone, with same fos- 

 sils. Strike and dip same as lower ledges. The latter ledges appear in 

 a bench, from which the slope sweeps up into the summit over the fol- 

 lowing beds. 



9. Eeddish-tinted shales, obscurely exposed in steep slope covered 

 with limestone debris, and representing a heavy deposit, possibly includ- 

 ing limestone layers. 



10. Buff- gray, thin-bedded, or shaly, slightly gritty limestone, forming a 

 heavy ledge ; dip 34°, N. 5° W. The lowest outcrop occurs at a level of 

 about 250 feet above No. 8, and as we ascend the hill the ledges rise, 

 showing similar buff-gray gritty limestones, the strike swerving round 

 more and more north of east, until in the summit the beds dip N. 30° 

 W., at an angle of 35° to 40°. There is here exposed a thickness of 

 above 100 feet of these arenaceous limestones, with shaly partings. Some 

 of the layers contain a small Pseudomonotis, Aviculopecten, and other 

 fossils prevalent in the lower limestones. 



Apparently the same ledges mentioned under bed No. 10 of above 

 section form the crest of the ridge to the west-northwest, which here 

 bounds Lincoln Valley on the north. In the slope descending into the 

 valley from this ridge we meet with the disturbed strata mentioned in 

 a previous page. The first exposure occurs about three-quarters of a 

 mile to the west-northwest of Station III, and is that shown at 2, B, in 

 accompanying plate. It consists of a heavy ledge of gray limestone, 

 exposed 15 feet, dipping 25° to 30°, N. 15° E. It is possibly the equiv- 

 alent of bed No. 2 of the foregoing section. Half a mile or so northwest 

 of the last exposure, apparently the same ledge appears, associated with 

 several others, shown in diagram C, as follows : a, dark-brown ferru- 

 ginous limestone, 10 feet exposed, and dipping at a less steep angle of 

 inclination than the overlying beds; b, shales, with dark ferruginous 

 limestone layers and concretionary masses, occupying a space 100 yards 

 across ; c, rusty-gray limestone ; cZ, shales, with dark ferruginous con- 

 cretions, space 50 yards across ; e, gray limestone, dipping 80°, S. 30° W. 



A short distance to the west the same ledges again dip north-northeast- 

 ward at an angle of 35°, as shown in diagram D. And a quarter of a mile 

 or so farther westAvard the strata again appear in a low ridge, dipping S. 

 25° W., at an angle of 60° to 65° (diagram E). To the west these de- 

 posits are soon lost to view in the debris covered slopes, which latter 

 form low bluffs near the stream, in which obscure exposures of reddish, 

 indurated arenaceous shales and soft and reddish sandstone debris were 

 noticed, but no outcrops by which their relations to the above-mentioned 

 deposits might be determined, although they have been compared with 

 the " Bed Beds" of the Trias. Similar sandstones and chocolate-colored 

 shales, including layers of nodular limestone, occur in the horizon of the 

 Triassic beneath the Jurassic strata in the broad synclinal ridge a few 

 miles to the southward, and in a more considerable elevation beyond our 

 southern line, and about due east of Mount Putnam, as seen from a dis*» 

 tance, a set of red-colored beds appear in force, which may also prove to 



