POCONO OF LESLEY; VESPERTINE OF ROGERS 19 



Feet 



1. Sandstone, more or less conglomerate 521 



2. Slate 22 



3. Sandstone with much conglomerate 726 



4. Sandstone with little conglomerate 240 



5. Sandstones variegated 409 



Total 1,918 



Underlying this he found 687 feet of red, gray, olive, and yellow sand- 

 stones, with some shale and some conglomerate, which he regarded as 

 transition. These lower beds are 525 feet on the Susquehanna and less 

 than 400 feet in Nescopec and Shickshinny mountains * Professor Clay- 

 pole made the total thickness at the Susquehanna in Perry county about 

 1,950 feet.t 



The measurements made by Doctor White and by the writer along 

 the westerly side of the Broad Top coal field, in Huntingdon and Bed- 

 ford counties of Pennsylvania, show the thickness to be not far from 

 1,100 to 1,200 feet, and the section consists mostly of sandstone; but at 

 somewliat more than 400 feet above the bottom Doctor White discovered 

 a thick bed of shale, portions of which are rich in Spirifer, Rhynchonella, 

 and productoid forms. Not a few of the sandstones show some con- 

 glomerate. Mr Ashburner reports a thickness of 2,133 feet in Sideling 

 hill, on the east side of this field in Huntingdon county, which appears 

 to be excessive, being greater than that obtained by Claypole on a line 

 of outcrop which should pass nearl}^ 20 miles eastward from Sideling 

 hill, and being nearly double the thickness observed by Stevenson in 

 eastern Fulton county, where it appears not to exceed 1,100 feet. Evi- 

 dently, as suggested by Doctor White, beds belonging to a lower series 

 have been included. 



In eastern Bedford of Pennsylvania and in Allegany of Maryland the 

 thickness varies little from 1,100 to 1,000 feet. The mass consists almost 

 wholly of sandstones, some of them conglomerate and becoming coarser 

 in Mar^yland, where the pebbles are sometimes three-fourths of an inch 

 long.J Streaks of coal, usually not more than 3 or 4 inches thick, are 

 found at various horizons, but especially in the upper portion. Whether 

 or not any of these are continuous to any considerable distance could 

 not be ascertained. Owing to the flattening of the anticlinals south- 

 ward, exposures within this area cease at a little way beyond the Virginia 

 line. 



*n. D. Rogers: Geology of Pennsylvania, 1858, vol. ii, pp. 8, 9. 



fE. W. Claypole : Prelim. Rep. on Palseontology of Perry county (F 2), 1885, p. 227. 



JC. C. O'Harra : Maryland Geological Survey, Allegany county, 1900, p. 109. 



