68 BAILEY ON GEOLOGY OF MAINE, ETC. 



part of York County, New Brunswick. A further examination of these doubtful beds 

 is greatly to be desired. 



Of true Devonian, none is known to occur in the immediate vicinity of the frontier, 

 unless it be a small band of dark grey and reddish conglomerates and shales, holding 

 remains of Psilophyton, which crosses St. John Eiver, a few miles above the town of 

 Woodstock. "While, however, as has been stated, much of what, in the Maine reports, has 

 been described and mapped as Devonian, is now known to contain a fauna quite low 

 down in the Silurian, the determinations of Mr. Billings of the collections submitted to 

 him would appear to indicate that strata bearing true Oriskany forms do occur at various 

 localities (such as Parlin Pond and elsewhere), in the northern part of the State, while an 

 outlier of similar age has been observed by Mr. W. Mclnnes, near the head of Tobique 

 River in New Brunswick. 



Upon the roads leading south from the town of Presqu'isle, in Aroostook County, and 

 not far from the border, the Silurian rocks are unconformably covered, over a small area, 

 by a series of bright red and rather soft sandstones and conglomerates. It is possible that 

 these may also be Devonian, the equivalents in that case of the beds of Perry, but in the 

 absence of fossils it seems altogether more probable that they are Lower Carboniferous, 

 representing the very similar beds of that age, which occur in a like position in the val- 

 ley of Tobicxue Elver, in New Brunswick. The absence, so far as known, of strata of 

 like age and origin from points further westward in the State of Maine, would appear to 

 indicate that the area of marine submergence in the later Devonian and Lower Carboni- 

 ferous ages, the westward extension of the great St. Lawrence or Acadian Basin, had its 

 western limit not far from the boundary line now separating New Brunswick from the 

 United States. 



