Huntingdon Counties, Central Pennsylvania. 531 



for this classification but cannot go into the discussion 

 of the question now. 



Formation. Description. 



I. 

 Allegheny Shale and sandstone, with workable coal beds. 



formation 



clay, and shale, with coal 



Pottsville Mainly sandstone, 



formation locally in middle. 



Mauch Chunk Mainly lumpy, red shale or mudrock, with 80 

 shale feet of thick-bedded sandstone at bottom to west. 



A little thin sandstone and limestone to east. 

 Mostly of Chester age. Siliceous crossbedded 

 limestone to west (Loyalhanna limestone) ; 

 gray and red, partly argillaceous limestone to 

 east (Trough Creek limestone of I. G-. White) 

 Warsaw age?. 



Thick-bedded, gray sandstone; Burgoon mem- 

 ber, at top; shale, red shale, and sandstone 

 below. Conglomerate at bottom to east. Thick- 

 est to east, in Broad Top Mountain. Most red 

 shale to west, on Allegheny front. Osage age. 



Lumpy, red shale or mudrock, thick-bedded, 

 micaceous red sandstone. 80 per cent red. Gray 

 and greenish shale and gray sandstone with 

 marine fossils, 20 per cent. Spirifer disjunctus, 

 Camarotoechia contracta, Grammysia elliptica, 

 Pteronites rostratus, and others. 



Mostly shale with thin sandstone layers. Some 

 thicker sandstone and conglomerate members. 

 Upper 1,000 feet largely purplish or chocolate 

 colored to west on Allegheny front, and the 

 same with red shale layers in the upper 500 feet 

 on Eaystown Branch of Juniata Eiver on the 

 east. Lower 2,000 feet gray and greenish. 

 Chemung fossils common to abundant from bot- 

 tom to top. Spirifer disjunctus at very bottom 

 on Allegheny front. 



II. 



Brallier Fine-grained, siliceous shale in thick, even 



shale layers revealing their fissility on weathering. 



Largely wavy or dimpled laminae, some even 

 and slaty. A few thin fine-grained sandstone 

 layers. Fossils small and very scarce. Buchiola 

 retrostriata, Prooeloceras lutheri, Bactrites aci- 

 culus, Phragmostoma natator. Upper Portage. 



Pocono 

 formation 



Catskill 

 formation 



Chemung 

 formation 



