1881.] '^^^ [White. 



98. A succession of shales, marls and thin shaly limestones, with 



occasional brown flaggy sandstones ; near the centre of which 

 occur very strong salt springs from which considerable salt was 

 formerly manufactured, the whole representing the Salina 

 group of New York. Thickness about 350' 



99. (a) Hard gray flaggy sandstone, 30', then follows 



(6) a succession of brownish sandy shales with a few thin layers 

 of impure limestone near the centre, and two layers of iron 

 ore, the one 6" the other 12" thick, and separated by 10' of 

 shales, 50' below the centre ; thickness about 300'. Then 

 comes 



(c) the main mass of the Clinton fossil iron ore 20' thick, quite 

 rich in iron, but entirely too siliceous ; once shipped from the 

 land of Mr. N. Alcaire on Limestone run by Uniontown, Pa., 

 parties to Lemont Furnace and one or two in Pittsburgh, but 

 after a thorough trial condemned by them all as too siliceous. 



((Z) Shales, 40' thick. 



This whole group {a, h, c, d), and probably a portion of the 

 overlying 350' in No. 98, representing whatever there may be 

 of Niagara (if any) and all of the Clinton (No. V) ; entire thick- 

 ness («, b, c, d) 380' 



100. Medina Sandstone (No. IV in part), seen forming the lowest 

 rocks in the ridge (anticlinal) half way between New Creek 

 mountain and Knobby range, the upper portion reddish brown 

 to gray iron-stained sandstone, containing Anthrophycus 

 harlani in great numbers, thickness 150' ; lower portion an 

 almost snow-white, very hard, fine grained sandstone, some 

 portions slightly streaked with iron, thickness 125' ; finely 

 exposed on Limestone run, one mile above its mouth Avhere 

 that stream cuts through the "Walker's Ridge axis. This is the 

 stratum which Mr. H. Gr. Jones identified as the Pocono, or 

 white sandstone of X, the 100' sandstone with which his sec- 

 tion ends (see Proc. A. P. S. Vol. XIX, No. 107, page 116). 

 (On the B. & O. R. R., one mile west from Brady's Mills, 15 

 miles east from Keyser this white sandstone is seen in a R.R. 

 cut 100' thick, and below it 500' of drab, brown, and bluish 

 shales ending in flaggy sandstones at base.) Entire thickness 

 of Medina at Keyser to base of white sandstone 275' 



SUMMARY. 



Carboniferous. 



Upper Coal measures (XV) 268' 1 



Barrens (XIV) 600' 



Lower Coal measures (XIII) 268' 



Conglomerate measures (XII) 451' \ 3929' 



Mauch Chunk shale 852'? 1100/ I 



Mountain Limestone 340' S " " ~ j 



Pocono (Vespertine) (X) 1150' J 



