1 



214 TRANSACTIONS OP THE 



several yards into this vein, and it appears that both in 

 quality and thickness it has not justified the expectations 

 which were previously entertained of it, but it is still, I 

 believe, in operation. Three other beds are known in 

 this ravine. 



Elk mountain. — A few weeks were devoted by me, 

 in the spring of the past year, to the examination of this, 

 the south eastern limit of this coal basin ; but many na- 

 tural difficulties in this remote and wild region, occurred 

 to prevent its complete and satisfactory exploration. 

 Traces of coal veins occurred at elevations of from 550 

 to 800 feet above Blossburg, and it appears that the car- 

 boniferous beds wholly crop out to tbe south, on the 

 southern crest of this mountain. 



LIMESTONE 



Is found two miles below Blossburg, within the limits 

 of the old red sandstone. I have traced this calcareous 

 bed during its course of many miles along the north slope 

 of the Armenia mountain, upon whose summit the coal 

 basin ultimately crops out. It is here a species of cal- 

 careous conglomerate, but occasionally is homogeneous 

 and crystalline. Colour greenish gray ; mottled ; burns 

 to grey sandy lime. Occurs stratified, several feet thick, 

 at the height of 300 feet above the Tioga. It approxi- 

 mates to the " cornstone" of the English red sandstone. 

 It is a prevailing rock in the old red sandstone of this 

 country. There are few places in the area where this 

 formation prevails, that this grey limestone is not acces- 

 sible. Lycoming and Bradford counties abound with it, 

 under the coal measures. Mr Miller's section shows 

 that it occurs at the same depth below the coal measures, 

 at the Portage Railroad, on the Alleghany mountain, at 

 the distance of 150 miles from the Tioga. 



Specific gravity of this limestone, 2.667. 



Weight of a cubic yard, 2 tons and 20 pounds. 



