986 NEW YORK STATE MUSEUM 



300 to 350 feet thick here and would make the top of the red 

 beds the top of the Devonic. 



All of the facts bearing on this difficult Devono-Carbonic 

 boundary problem will not be at hand till paleontologic re- 

 searches from both the Devonic and Carbonic starting points 

 have been finished and detailed stratigraphic work has been 

 carried eastward, southward and westward to connect with bet- 

 ter known and more clearly differentiated areas in these direc- 

 tions. Hence this boundary is to be recognized and accepted as 

 distinctly provisional only and is subject to such change as 

 later investigations of the stratigraphy and paleontology of the 

 adjacent regions may warrant. 



The Olean has been agreed on as Carbonic but there has been 

 considerable difference of opinion as to just what portion of the 

 Carbonic it represents, though the weight of opinion has been 

 in favor of its age being Pottsville. Very recent field studies 

 by Messrs M. R. Campbell 1 and David White are regarded by 

 them as definitely establishing its Pottsville age. It is still 

 doubtful, however, as to what part of the Pottsville it repre- 

 sents. It may be the equivalent of either the Connoquenessing or 

 of the Sharon. If it be equivalent to the Sharon, the few feet of 

 overlying shale represent the Sharon shale and the thin coal 

 bloom the upper Marshburg coal. If it be the Connoquenessing, 

 the overlying shale and coal belong to the AJton or Mercer coal 

 group. Detailed work to the south and west will be necessary 

 to settle this point. 



RECONNAISSANCE 



A reconnaissance was made southward into McKean county, 

 Pa. and then westward on both sides of the state line nearly to 

 the western edge of Warren county, Pa. 



Wolf creek conglomerate. South of Ceres the Wolf creek con- 

 glomerate is well developed along King's run, being in places 

 fully 20 feet thick but weathering into pieces a few inches to a 

 few feet thick. It dips under stream level a short distance 

 north of Glenn postoffice. West of this point on the road to 

 Eldred it appears at the upper fork of Newel creek and is again 

 seen on the road just south of the upper fork of Barden brook, 

 whence it may be traced to Eldred where it outcrops 120 feet 



1 Personal letters from Mr M. R. Campbell, Ap. 18 and 27, 1903. 



