SUBCARBONTFEROUS MEASURES. G 5 . 57 



ping to the southeast. — Its resemblance to the Corry Sand- 

 stone of Erie county is very striking.* 



The 265' of shales (11) includes several beds of grayish- 

 white, tolerably coarse, current-bedded sandstone, f — On 

 Roaring branch, we see from 200' to 250' of reddish- olive- 

 colored shale, in which no sandstone layers are noticeable ; 

 and then more shales below, in which sandstone layers occur. 



The 35' Griswold Gap Conglomerate (12) is a remarkable 

 horizon. In the whole 800' to 850' interval between it and 

 the Bottom Conglomerate of XII, our section of Mauch 

 Chunk and Pocono rocks has not exhibited a deposit in 

 wiiich the quartz pebbles are numerous, large or persistent 

 enough to warrant the name of a conglomerate. But at this 

 horizon lies a true conglomerate, so solid and massive as to 

 make the crest of the Moosic mountain. 



In the notches of this crest the rock can be studied all 

 along the western border of Wayne county, and it has two 

 fine sloping outcrops on the opposite side of Griswold' s gap, 

 just east of Forest City, on the road to White Oak pond. 



Its outcrop from this gap can be followed, northward, to 

 near Mt. Pleasant, usually on the eastern slope of the moun- 

 tain crest ; and southward, across the Wayne county line 

 into Lackawanna county, about 5 miles south from Way- 

 mart. 



Its pebbles, very white, are somewhat angular and flattish 

 rather than ovoid, vary in size from \" to 2", and rest in a 

 rather coarse, brownish-gray matrix weathering whitish. :£ 



Fish bed of Mix' s gap. — A calcareous layer, 2' to 3' thick, 

 outcrops near the base of the Griswold Conglomerate, just 

 west of Way mart, in Eix' s gap. Pebbles of red shale and 

 greenish shale and many fish remains are mixed with the 

 ordinary quartz pebbles. 



* The top of the Corry Sandstone is only 280' beneath the Sharon Conglonu 

 erate in Erie county, while the top of this {Lackawanna) sandstone is 410' be- 

 neath the Bottom Conglomerate at Scranton ; but the whole Palaeozoic col- 

 umn thins westward. 



t Thickness estimated. It cannot be less than 250' nor more than 300'. 



\ I would compare this formation with the Cussewago Sandstoneot' my Erie 

 county report, Q, 4 . 



