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



C. Transition layers, JSub-Pocono. 



A markedly different kind of sediments from the con- 

 glomerate just described occupy the next 375' as follows : 



Fig. 8. 



13. Concealed for 50' 



14. Sandstone, gray, current-bedded, .... 15' 



15. Concealed for 25' 



16. Sandstone, grajnsh white, 20 



17. Concealed for 25' 



18. Sandstone, gray, current-bedded, 15' 



c Sandstone, gray, layers; and > 



19. \ Sandy shales, reddish, \ 200 ' 



20. Mount Pleasant Conglomerate, 25' 



The North and South Knobs of the Elk mountain range 

 are made by this group. 



Mount Ararat and the Sugar-loaf of the Moosic mountain 

 range, are similar isolated heights preserved from erosion by 

 outlying patches of this group ; 250' to 300' of the section 

 being visible on and around their summits; — horizontal 

 plates of coarse, grayish-white, current-bedded sandstone 

 (often streaked with layers of small quartz lobbies), each 

 from 15' to 25' thick, and separated by beds of sandy shale 

 (some of them, especially those low in the series, of reddish 

 hue) from 20' to 50' thick. 



The Mount Pleasant Conglomerate* at the base of the 

 group is a massive grayish white sand rock, 20' to 25' thick, 

 through which pebbles of quartz are scattered, and some- 

 times in such abundance as to constitute it a conglomerate. 



Even where the whole mass is most of a sandstone, there 

 is always a pebbly portion near the bottom, 3' to 6' thick ; 

 and the pebbles in this lower portion are reddish or rose 

 colored, in striking contrast with the white pebbles of the 

 Griswold gap conglomerate. 



Fish bed: — A calcareous conglomerate, 2' to 3' thick, 

 forms the base of the Ml. Pleasant rock, like the Griswold 

 gap rock: — quartz pebbles, pieces of shales, wa&'fragments 

 of fish bones (to all appearance) so worn as to be undeter- 

 minate. 



*The summit of the bill at the village of Mt. Pleasant is capped by it. 



