18 J. J. STEVENSON LOWER CARBONIFEROUS, APPALACHIAN BASIN 



The anthracite strip. — The most northerly exposures, respecting which 

 detailed information exists, are in the northern Anthracite field, within 

 Aya3'ne county, at about 10 miles south from the New York line. There 

 the section"^ is 



Feet 



1. Sandstone 40 



2. Shale and sandstone 200 



3. Massive sandstone 125 



4. Shale and current bedded sandstone 265 



5. Giiswold Gap conglomerate 35 



6. Sandstone and shale, imperfectly exposed 150 



7. Sandstone and sandy shale 200 



8. Mount Pleasant conglomerate 25 



Total 1,140 



Doctor White is inclined to regard the beds below number 5 as transi- 

 tion from the Catskill. He finds great resemblance between the higliest 

 sandstone of the section and the Shenango sandstone of Crawford county, 

 which in the northwestern part of Pennsylvania is the most notable fea- 

 ture of the Pocono. The Mount Pleasant conglomerate is recognizable in 

 Monroe county, 20 miles farther east.j Near Pittston the thickness is 

 less, only 753 feet, of which the upper 353 feet J is mostly massive sand- 

 stone, but the increase southward and southwestward in the other fields 

 is very notable, for the upper portion becomes 600 feet at Shickshinny 

 and between 700 and 800 feel in the gaps of Little mountain. Thin 

 irregular streaks of coal occur in this portion on North mountain which 

 separates Columbia and Luzerne counties. § Mr Winslow's sections, as 

 given by Professor Lesley, though measured instrumentally, do not differ 

 materiall}^ from those of Doctor White. Including the transition beds, 

 he finds 1,177 feet in the northern field, 1,110 feet on Nescopec moun- 

 tain, and 1,253 feet near Mauch Chunk, all sandstone except about 75 

 feet at the last localit}^!! 



According to H. D. Rogers's summary description, the Pocono (Ves- 

 pertine) shows greatest thickness and coarseness at the southeast. It is 

 2,000 feet on the Susquehanna, 1,800 feet at Pottsville, 1,100 feet in the 

 Nescopec mountain, while in the mountains enclosing the Nortliern or 

 W3^oming field it is but 500 or 600 feet. The section at Pottsville is 



* I. C. Wliite : Geology of Wayiae and Susquehanna counties (G5), 1881, p. 50. 

 tl. C. White: G 5, p. 90. 



X I. C. White : Geology of the Susquehanna region (G7), 1883, p. 39. 

 il. C. White: G7, pp. -17-49. 



II J. P. Lesley : A summary description of the geology of Pennsylvania, vol. ii, 1892, p. 16.^5. 

 This will be quoted as Final Report. 



