532 GEOLOGICAL SUEVEY OF THE TERRITORIES. 



heavy-bedded sandstone, generally light bluish-gray or whitish in color, 

 but in places turning to yellowish or even reddish brown. It includes 

 numerous local bands or seams of shale, grayish drab in color, and in 

 parts dark carbonaceous with indications of coal. The rock itself in 

 places passes into a coarse sandy shale, and this unequal hardness causes 

 its exposures to assume a peculiarly rugged, and rough appearance in 

 many places, huge bastions standing out from the cliffs, and occasionally 

 presenting rude resemblances to architectural forms. We found no 

 traces of fossils anywhere in this sandstone, but from the appearances 

 I should judge that a more extended examination might discover them 

 in some of the intercalated carbonaceous shales. 



Point of Eocks. — In the bluffs near Point of Eocks Station, and 

 above the heavy sandstone, are four or five different seams of coal, the 

 uppermost one of which must be at least 150 to 200 feet above it. Still 

 above this, near the top of the hill, we found a bed containing a great 

 abundance of a large species of oyster, different from those found in the 

 beds Nos. 9 and 12 of the preceding section. We did not make a Close 

 examination of the beds here, as their horizon is included in the section 

 just described, though tbey do not correspond exactly in lithological 

 characters. The better development of the coal here may be merely 

 local 5 it did not appear so near the top of the sandstone on the line of 

 our examinations, and it seems almost too low in geological position to 

 be referred to the horizon of the Hallville beds, although it may occupy 

 the same. 



Commencing at the base of the great sandstone at a point about two 

 and a half miles west of Point of Eocks, and proceeding westward near 

 the railroad track, Mr. Meek and I observed the following succession of 

 beds in the descending order : 



Section near tJie railroad between Foint of EocTcs and Salt Wells. 



Feet. 



1. Gray and drab sandy shales, with some harder bands of ') 



brownish sandstone 25 ( 



2. Massive drab sandstone 27 ^ M. 



3. Bluish and dark colored sandy shale 3 I 



4. Gray sandstone with fossils 1^\ 



5. Yellowish and brownish-gray sandstone and shales .. 55 '] 



6. Shaly and massive brownish and buff sandstone 36 | 



7. Shale, partly dark colored ; appearance of coal 2 { 



8. Soft bluish-white sandstone, mostly in heavy beds, some 



of its upper portion laminated with a little dark shale, I -vj- 



and appearance of coal 30 ' 



9. Grayish sandstone, weathering brown, shaly in places, 



with some whitish beds above 45 



10. Heavy-bedded whitish sandstone 14 



11. Brown or buff sandstone, with some sandy shale 22 ', 



12. Arenaceous shales and clays, yellowish or drab in color, ) ^ 



with thin laminae of harder brownish sandstone 155 j ' 



13. Heavy-bedded buff and bluish-white sandstone and sandy ) 



shales ; . 86 



14. Dark carbonaceous shale or coal 2^ 



15. Soft grayish-buff' and bluish-white sandstones, with yellow- 



ish-drab sandy clays and shales; some thin carbonaceous 



seams 90 



16. Black carbonaceous shale or coal , 2^ 



17. Brownish and dark-colored shales 18 



