48 G 5 . REPORT OF PROGRESS. I. C. WHITE. 



ing), and Lower (conglomerate) appears, their relative thick- 

 nesses being : — 



In Mercer co. At Btossburg. At Mclntyre. 



Upper, 50' 40' to 60' 27' (visible) + 



Middle, 237' 100' 229' 



Lower, 20' 55' 66' 



307' 215' 332' 



and to render this easy of reference Mr. Piatt's sections are 

 reproduced here, as Fig. 4 and 5. 



The thickness of the whole formation is somewhat greater 

 at Mclntyre than at Scranton and Forest City ; and con- 

 siderably less at Blossburg. 



In Northwestern and Western Pennsylvania, Reports H, 

 Q, R, V, &c. show XII subdivided into three sandstone 

 deposits (separated by coal measure intervals) ; the Lower 

 division being a persistent Conglomerate {Sharon, Garland, 

 or Olean) ; and the whole formation measuring about 300'. 

 (See for example Report QQQ, on Mercer county, page 33, 

 the figure of which is reproduced here as Fig. 6.) 



It looks very much as if the Scranton current-bedded 

 sandstone, the Mclntire Upper Conglomerate* the Bloss- 

 burg Monkey ledge, the Johnson run rock of McKean, and 

 the Homewood Sandstone of the Beaver river country, were 

 all the same. 



Mr. Piatt' s description of the Monkey ledge rock of Tioga 

 county (which I have myself verified on the spot) so closely 

 fits the Scranton Sandstone, that I need only repeat it here 

 in his own words (G, p. 168) : — 



' ' The Sandstone which underlies the Seymore Coal bed, 

 is one of the most marked and persistent features of the 

 Blossburg Coal Basin. It is known in all the different lo- 



*It seems impossible to identify this with the Mahoning Sandstone of the 

 west, because of its short height (295') above No. XI; an interval scarcely 

 sufficient to hold No. XII alone, without any of the overlying (Lower Produc- 

 tive) coal measures. 



If my identification be correct ii will have an important bearing on our no- 

 menclature ; for the coal beds under the Monkey ledge at Blossburg, and the 

 coal beds under the Scranton Sandstone, have been accounted a part of the 

 Lower Productive coal measures ; whereas they should be regarded, I think, 

 as Inter-conglomerate coals (Mercer, Quakertown and Sharon beds.) 



