568 



KEPORT UNITED STATES GEOLOGICAL SURVEY. 



The following - is the general section from the base of the range: 



Section Xo. 20. 



1. 'White quartzite. 



2. Thin-bedded, somewhat ckerty limestones. From these beds Professor Bradley 



obtained characteristic Quebec fossils in 1872. 



3. White quartzites. 



4. Space iu wnich beds were riot noted. 



5. Dark-colored limestones. 



6. Dove-colored banded limestones outcropping on Station 76. 



7. Light-colored laminated limestones. 



8. Very dark blue limestones with reddish and yellow bands. 



9. "White quartzites. 



The upper limestones and the white quartzites (No. 8) should probably 

 be referred to the Carboniferous formation, while all below is probably 

 of Silurian age. 



South of the canon of the Portneuf the mountains consist of several 

 parallel ridges somewhat lower in elevation. The entire mass is much 

 broader than that to the north. We had but few stations in them, and 

 these mainly towards the south end. Near the south end of the most 

 western of these ridges (the one overlooking Marsh Creek Valley) Sta- 

 tion 133 was located on limestones dipping north 87° east. The general 

 strike, as we looked north, appeared to be about north 5° west. The 

 angle of dip was 30° to 35°. The following section was made : 



16. 



17. 



18. 

 19. 



20. 

 21. 

 22. 

 23. 



Section (A r o. 21) at Station 133. 



Top. 



Blue limestone 



Laminated blue limestones, with Conocoryplie, Dikelocephalus, Ooo- i 

 lella, and two species of Batliyurus > 



Bluish-gray limestones S 



Laminated limestones, with bands of greenish shales in the upper 

 portion. The limestones are separated by shaly layers. The lime- 

 stones are fossiliferous at the base, containing quantities of a 

 Trilobite like Conocoryplie. The limestone resembles an oolite, but 

 the structure is probably due to the presence of some peculiar > 

 organic remains. Fragments of Discina are seen , 



Rather massive limestones 



Laminated blue limestones, in bands of from one to two inches thick 

 ness, the surfaces of which are yellow-stained 



Rather massive limestones ) 



Green shales or slates, 15 feet > 



Bluish-gray limestone ) 



Bluish limestones, with bands of shales - 



Massive blue limestones. The dip here appears to be about 40 c 



Laminated limestones with interlaminated green shales 



Greenish sandstones and shales, passing below into silvery-gray slates. 



Slates and shales with a band of limestone about the middle 



Blue limestones with irregular structure. The strike is about south ) 

 5° east, and beyond the station it appears to curve to the south ; > 

 dip is 60° S 



Rusty yellow quartzite 



Gray and yellowish quartzites 



Greenish-gray slates 



Rusty yellow quartzite, somewhat conglomeritic and containing a ) 

 considerable percentage of iron ) 



Rusty quartzites, about 



White quartzites ) 



Pink and white quartzites $ 



Red slates, thickness not taken 



Feet. 

 130 



315 



120 



118 



155 

 100 

 70 

 210 

 185 



70 



150 



450 



180 



130 



600 

 500 to 600 



Total 3,483-3,583 



Below this last layer there are probably the limestones of the Red 

 Eock Pass, which I think lie above the quartzites of Station 132, 



