226 GEOLOGICAL SURVEY OF THE TERRITORIES. 



4. Gray crystalline limestone, with cross cleavage, breaking into small 



irregular pieces, lb feet. 



5. White quartzite, 3 feet. 



6. Dark quartzite, 6 feet. 



7. Gray limestone, with shaly bauds and cross-cleavage, harder and 



lighter colored in the upper part of the bed, 20 feet. 



8. White quartzite, gradually becoming darker until it is red, 80 



feet. 



9. Very hard brownish limestone becoming laminated and dark-col- 



ored towards the top, 125 feet. 



10. Light-colored quartzite, 50 feet. 



11. Brown volcanic rock like that on the summit of Mount Linjcoln, 



only darker in color. 



" Below Xo. 11 is the limestone in which the mines are situated. After 

 about 100 feet of this is a gray crystalline limestone, very hard and com- 

 pact. This continues for several hundred feet. It is very irregular and 

 much broken up, and is followed by a brown crystalline limestone, from 

 which there is a great deal of debris.''^ 



Fig. 5, Plate VI, represents a section through Mount Lincoln and Mount 

 Bross, in a direction north and south. Monnt Bross is nearly two miles 

 south of Mount Lincoln. Between the two there is therefore a portion 

 hollowed out, probably by glacial action. A semicircular ridge connects 

 the two mountains, which were once probably continuous. On this ridge 

 Mr. Holmes made the following section from below up : 



1. Gneiss. 



2. Quartzite. 



3. Blue limestone. 



4. Yellow limestone. 



5. Limestone, (ore-bearing.) 



6. Volcanic. 



1 learn from Mr. Gardner and Mr. Holmes that the quartzites are 

 faulted on Mount Lincoln. The quartzites are probably the equivalent 

 of the Potsdam sandstone, and the limestones, which are mostly magne- 

 sian, should be referred to the Quebec group. In the latter, in Four 

 Mile Creek Canon, 1 found fossils that point toward such a conclusion. 

 Fig. 6, Plate VI, is a section through Mount Bross from west to east. 

 The beds of the section will be found in Doctor Endlich's report. Further 

 notes in regard to Mount Lincoln will be found also in Doctor Hayden's 

 report. West of Mount Lincoln is Buckskin Mountain, which heads 

 three streams, viz : the South Platte Eiver, Buckskin Creek, and a 

 branch of the Arkansas Eiver. The first flows to the northeast, and 

 turning to the east around Mount Lincoln, flows southeast. The second 

 flows to the southeast into the South Platte, while the third flows to the 

 northwest for about five or six miles, and then turns to the southwest 

 and empties into the Arkansas. Above the town of Montgomery, 

 between the South Plate and the Blue Elvers, on the main divide, is a 

 pass called Hoosier Pass. Its elevation is 11,364. lu regard to the 

 geology here, I refer again to the notes of Mr. Taggart, who says : "The 

 pass shows no outcrop, but is covered with granite boulders. East of 

 it is a point, (A in Fig. 3, Plate VI,) the sides of which show no out- 

 crop. The summit, which is flat, is covered with volcanic rock, and holes 

 dug by prospectors\show the same material. There is a slope to the 

 eastward. In the depression or saddle between this point and the next 

 •one, which is higher, the surface is covered with a debris of fine-grained 

 gray granite. As we ascend the higher summit we meet first with an 

 •outcrop of volcanic rock, and then higher up an outcrop of coarse con- 



