peale.1 DESCEIPTIVE GEOLOGY — WYOMING EANGE. 541 



Section Xo. 9. 

 Base. 



1. Massive blue limestones reaching from the base of the cliffs to a point 



about 1,600 feet above ; thickness about 2,700 feet. 



2. Bed limestone ) 



3. Blue limestones, with crinoidal stems; indistinct corals and fragments > 800 feet. 



of an Archimedes t ) 



4. Quartzites -- j 



5. Blue and yellow limestones > 1,400 feet. 



6. Quartzites on station 48 ) 



4,900 feet. 



The lower layers have a very old look, and are in all probability Sub- 

 carboniferous, although they may be Devonian or Upper Silurian. The 

 dip of the strata is about 20° to the westward. 



Station 55, or Wyoming Peak, is almost due west of station 48. It 

 is, however, on higher beds that represent the Trias formation. 



The following section was made on the peak : 



Section No. 10. 

 Top. 



10. Eed quartzitic sandstones forming summit of the peak about 110 feet. 



9. Eed sandstones with quartzitic arid shaly bands ) 



8. Light brick-red colored sandstones > 60 feet. 



7. Mottled calcareous sandstones . ) 



6. Purplish limestones with mottled layer i 1 r f et 



5. Bluish and purplish quartzites | ° e " 



4. Eed sandstones and shales 350 feet. 



3. Bluish limestones , 250 feet. 



2. Dark quartzites \t$~.+ +„i an 



1. Conglomeritic sandstones ^xsox taken. 



Total 920 feet. 



These beds are almost horizontal and tongues run out to this eastward 

 from the crest of the range onto the spurs. Between this section and 

 the section of station 48 there must be from a thousand to fifteen hun- 

 dred feet of beds that probably represent the Carboniferous coal mea- 

 sures. Xorthward from the station there appears to run a synclinal 

 depression. It is rather shallow, and not very broad. It is probably 

 the same one that will be referred to again as occurring on McDougal's 

 Creek. 



Station 49 was located on a limestone ridge that appeared to stand 

 out to the east from the main range. The dip of the rocks is here more 

 to the southward. On the summit a quartzite outcrops, and below it 

 are blue limestones, followed, as we descend, by yellow limestones. The 

 quartzites are probably the same as those of layer ISTo. 5 in the section 

 made at station 48. The view as we look southwest into the main range 

 shows a confused mass of high peaks in whose recesses lie huge snow-banks. 

 The synclinal, north of station 55, can be distinctly traced, and at this 

 point it appears to be broader than at any other. This has preserved a 

 greater body of the Eed Beds (Trias ?), and we found that the water on Lan- 

 der Creek, from their erosion, had a red tint not observed on the other 

 streams. A succession of quartzites and reddish sandstones with inter- 

 laminated gray beds could be seen dipping west at an angle of about 30°. 

 Station 49 was named by us Mount Lander, after a civil engineer who trav- 

 ersed a large portion of this region on surveys for a wagon road across the 

 country. There are two passes across the Wyoming Bange within the 

 limits of our district, viz, Thompson's Pass and McDougal's Gap. The 

 former is the one by which the Lander Cut-off road crosses, and is at the 

 southern end of the range. McDougal's Gap is about 25 miles farther 



