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



The Pottsville Conglomerate rocks (No. XII) occupy a 

 narrow pointed triangular area of only about one square mile 

 in the southeast corner of Susquehanna county, and in the 

 neighboring border of Wayne. 



The Mauch Chunk red-shales (No. XI) underlying the 

 Conglomerate, rise to the surface on the east and west of the 

 triangle, and continue in a narrow pointed belt to the north 

 of it along the county line. The dips on the two sides of 

 the trough vary between 8° and 30° ; and the breadth of out- 

 crop is slight, because the whole formation (3000' thick at 

 Mauch Chunk) is here less than 200' thick, as described in 

 Chapter V. 



The Pocono Sandstone formation (No. X) being 600' or 

 700' thick, and dipping 10° or 12°, crop out along two some- 

 what broader belts, one in Susquehanna county (a continua- 

 tion of the Lackawanna mountain) ; the other in Wayne 

 county a (continuation of the Moosic mountain,) outside the 

 narrow belts of shale. The two outcrops unite and continue 

 as one, northward, along and a little west of the county line. 



The Cat skill formation (No. IX), measuring from top to 

 bottom about 2000', spreads itself almost horizontally over 

 the rest of the surface of the two counties, 95 per cent, of 

 which is occupied by the faces and edges of sandstone, shale, 

 and calcareous breccia beds belonging to this formation. Al- 

 most all the valleys are excavated in it, and their side slopes 

 are cliff ed and terraced by its nearly horizontal strata. But 

 none of these valleys are deep enough to reach and expose 

 the underlying Chemung. 



Chemung rocks (No. VIII) are exposed only in Northern 

 Susquehanna county, along the wide valley of the Susque- 

 hanna river, and the narrower valleys of the streams flowing 

 into it ; and in the northwest corner of the county the To- 

 wanda anticlinal elevates the Chemung to the hilltops, so 

 that 275' feet of the upper part of the formation is exposed. 



The total column of strata (XII, XI, X, IX and VIII) visi- 

 ble at various parts of the surface of the region amounts to 

 about 3355'. 



2. The rock structure of the region is somewhat anoma- 

 lous and very interesting. 



