Ashburner.] 540 fFeb. 16, 



The sandstones are more argillaceous and not as massive ; they are coarse 

 grained and stained with iron, and at times contain red and yellow specks. 



The shales are both argillaceous and silicious, and the alternations with 

 the sandstone are more frequent than in th ■ upper member. 



The predominating colors of the sandstone and shale are gray, yellow, 

 olive and green. 



This member seems to contain more ferruginous matter disseminated 

 through the strata than either of the other members, and quite frequently 

 iron concretions are found. 



The horizon between the Pocono (X) and Catskill (IX) is not very dis- 

 tinctly marked. The greatest distinction between the two is that of color. 

 The upper strata of the Catskill are more argillaceous than those at the 

 bottom of the Pocono, which fact iu a measure determines the topography 

 of the two. 



Prof W. M. Fontaine, in Silliman's Journal for January and February, 

 1877, gives a description and section of the Vesi)ertine (Pocono, Xj in West 

 Virginia. 



In Lewis Tunnel through the Alleghany Mountain, on the Chesapeake 

 and Ohio R. R., he has constructed the following section : 



135 feet. Upper part (30 feet) dark shales, olive and reddish marlites, 

 below which occurs 10 feet of firm thin bedded black shale lioMing a local 

 coal 12 inches thick. The lower half is composed of firm, silicious, rather 

 coarse bluish-gray sandstone holding bits of lower rocks, drifted stems 

 and coal beds. 



Below this mass come the coal-beariug strata 315 feet thick, distributed as 

 follows : 



15' Black sandy slates. 



3' Sandstone. 



6" Coal, slaty. 



5' Fireclay containing rootlets . 



2" Coal. 

 1' Fireclay. 



30' Gray sandstone with films and streaks of coal (floated). 



1' Black slate and coal. 



3' Brown flaggy sandstone. 



8" Coal. 

 5" Fireclay. 



5' Bluish-black sandy shales. 



50' Gray flags. 



— Interval (?) feet thick. 



20' Olive sandstone. 



40' Argillaceous thickly bedded sandstone with thin films of 



coal and black shale. 



Below this series occurs a white, pebbly, silicious sandstone, very per- 

 sistent, at least 60 feet thick, the mass directly underneath being concealed. 



