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



The coal wrought at Forest City seems to me, from the 

 structure there, to be the equivalent of No. 6 of that section 

 which is the lowest workable bed in the Carbondale, or 

 Lackawanna coal basin. 



No attempt was made at Forest City to work out the de- 

 tailed structure, since the country is a wilderness, exposures 

 are rare and it would have taken much more time than was 

 at my disposal to have accomplished the task even if it can 

 be done at all. Then too, the structure of this anthracite 

 basin will be worked out in detail by other hands during the 

 progress of the survey, and this most northern area will then 

 receive its due share of attention. 



I provisionally regard the previous sections as representing 

 the conglomerate measures at the western line of Pennsyl- 

 vania, the massive current bedded rock 75' thick at the top 

 of Fig. 1, being the representative of the Homewood 88., 

 while the coal group coming below it and including the 

 Forest City bed would correspond to the Mercer coal group 

 of western Pennsylvania, the Alton group of McKean and 

 the Bloss coals of Tioga, and Bradford. This conclusion 

 will seem reasonably warranted to any one who will care- 

 fully examine the structure of these coal fields as given in 

 Reports G, G 2 , G 3 , Q 2 , Q 3 , and R. 



The massive current bedded SS. or "Monkey Ledge" 

 of Tioga and Bradford is a perfect parallel to No. 1 of the 

 section (Fig. 1, page 44) which is found all through the Car- 

 bondale basin, and any one who has studied the two rocks 

 in the field could with difficulty resist the conclusion that 

 they are identical. 



At the northern end of the Forest City coal field the dip 

 is very rapid. Only one locality was found where it could 

 be measured and this is in a cut on the Jefferson Branch 

 R.R. near the southern end of Still Water pond. There it 

 is 27° S., 30° E. The Lackawanna river at this point breaks 

 through the northern branch of the Moosic mountain, and 

 enters the synclinal trough of the Lackawanna or Third an- 

 thracite coal basin. 



As we go north-westward from the Forest City region the 

 rocks rise with great rapidity for about two miles from the 



