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



both sides of the mid-county line, no complete exposures of 

 it can be found, because its dip is precisely equal to the fall 

 of the mountain brooks in the ravines opposite Forest city, 

 where the top layers are exposed for a long distance up the 

 Moosic mountain. 



The equivalence of this Bottom conglomerate of XII on 

 the Lackawanna with the 60' rock under the Bear creek coal 

 in Tioga county looks probable ; but its equivalence as a 

 whole with the Olean- Garland- Sharon conglomerate of the 

 northwestern counties is doubtful ; the principal objection 

 being the fact that a coal bed underlies the 100' conglomerate 

 at Scran ton (which would represent the Kidney bed, under 

 the 60' conglomerate at Blossburg), whereas the Sharon coal 

 bed overlies the Sharon conglomerate. But on the other 

 hand coal and black slate underlie the Olean (Sharon) con- 

 glomerate as far west as McKean county.* 



But the lowest 20' of the Bottom conglomerate (separated 

 at Scranton (Fig 1) from the upper 80' by a coal-slate layer.) 

 greatly resembles the Olean- Garland- Sharon conglomerate 

 in the quantity, quality and (what is more important still) 

 in the shape of its pebbles, and in the character of their 

 matrix. 



During the summer (1880) I made a careful study of the 

 Fallbrook (Blossburg, Tioga county) coal section, and in- 

 cline to the view that the Kidney bed may be regarded as the 

 equivalent of the Sharon bed of the west. I found two or 

 three species of plants {Lepidodendra) in the roof shales of 

 the Kidney coal which are very common in the Sharon coal. 

 Also a Whittlesey a f too ill-preserved to be certainly identi- 

 fied. Should undoubted specimens of Whittlesey a elegans 

 be found in the Kidne?/ coal shales, I would consider the 

 question settled ; for this plant is peculiar to the Sharon 

 coal bed. 



Sub-conglomerate coal. The bed frequently seen under 

 the ovoid-pebble conglomerate^ and sometimes as much in- 

 terleaved with the basal layers of the conglomerate as under- 



*Mr. Ashburner's Lower Marshburg coal bed. 



fThis epithet has become useful in designating the Olean- Oar land-Shar on 

 conglomerate. (See Reports I.I.I, Q 3 , QS R, &c.) 



