116 NEWTBACK IN NOETH AMERICA. 



Coal, (good) 



Shales 



Ferruerinous sandstone 



^.^ — ^^^.....^^^ . 



Massive sandstone . • . . • , • • • 

 Sandstone, more or less clayey, occasionally Tvitli weU- 



, In , 



5 



4 



3 



20 



Slates 



marked vertical cleavage ...... 80 



. 20 



• • • 



Sandstone to bottom of rock exposure. 



The same bed; less perfectly exposed^ is seen on the west 

 side of the caiion, abont half a mile aboA^e ; near it are beds of 

 a heavy dark grey stone, containing^ according to an analysis 

 by Messrs. Williams and Moss, 22 per cent, of iron. 



'' Carbonaceons shales are exposed in the main valley neai 

 the caiion. Eetuming from the coal bank to the main valley, 

 we ascended it abont three miles. It became gradually 

 narrower, and at length was merely a canon, trending north- 

 west. We saw in it several exposures of coal, which had 

 been imperfectly opened ; but, as far as I could judge fro 

 the appearance of the contiguous beds of sandstone, they were 

 parts of the same bank which I have described above. Iron 

 ore, and large quantities of silicified wood of exogenous 

 growth, occm- at this place. Similar beds are said to be exn 



m 



posed in other canons of this valley ; and I afterwards learne 

 from Mr. Maxwell that he had seen them also many mile 

 ahoye, in the main valley. Time was pressing, and we rein 

 antly postponed further examinations till another occasion, 

 ^' August 20th, Captain Colton visited the coal-bank 

 Blackmore Canon, one of the north-eastern branches of th 

 Yermejo. He procured specimens of the coal — which is o 

 excellent quality — and kindly furnished me with the foUowin 



F 



of the strata near the bed 



Ssm dstone 

 Slate 



Ft. Ill 



7 

 1 



Sandstone and clay 2 



l| 



