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



Elk Mountain gray shale (2), lo(V to 200' thick, covers a 

 much wider area of the district, but is seldom well exposed 

 to examination. Its outcrops around the slopes of the North 

 and South knobs of the Elk mountains, show that it con- 

 sists largely of grey, red, green and spotted shales, with few 

 sandstone layers. But in other localities a good many grey, 

 current-bedded sandstone layers go to make up the mass. 



Cherry Ridge group. — This consists of an upper division 

 of coarse and line sand, 55' thick, a middle limestone bed, 

 5' thick, and a lower division of red shale, 110' thick (= 170' 

 in all) ; well exposed near Cherry Hill P. O. Wayne county ; 

 but very extensively outspread in both counties. 



Cherry Ridge conglomerate (3), (capping Collins' high 

 knob just west of Cherry Ridge P. O.) It is usually 20' 

 thick, but sometimes 25' ; a grayish white, very hard rock, 

 filled with reddish-quartz pebbles through the southern 

 half of Wayne county ; but in the northern half of Wayne 

 county the pebbles are scattered through it only in some 

 localities. 



In Susquehanna county this conglomerate seems to have 

 been eroded from the whole country except along the high- 

 lands of the eastern townships. It is a prominent feature 

 of the surface in the Elk mountains, and along the plateau 

 to the northward. 



A calcareous breccia is often found at its base, which in 

 Southern Wayne county is itself full of quartz pebbles. In 

 eastern Susquehanna county this breccia is a black stratum, 

 5' thick. 



Cherry Ridge shales (4,) 20' to 25' thick, usually of green- 

 ish, or olive color, separate the conglomerate from the un- 

 derlying sandstone. 



Cherry Ridge sandstone (5,) 15' thick, gray, current- 

 bedded, forms with the underlying limestone, a conspicuous 

 rock ledge at hundreds of localities in all parts of Wayne 

 county; but followed southward into the southern townships 

 it is seen becoming coarser and finally Avell supplied with 

 reddish- white quartz pebbles. In the general geology of 



