EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA l6l 



identity with the Catskill beds which stand sheer on the other side of the 

 Hudson river in bights of several thousand feet and only 30 miles away 

 from the outlier at Austerlitz. 



b Dana indicated by the term "Worcester trough," a hypothetical 

 Appalachian waterway in which the Carbonic beds of Worcester, Mass., 

 eastern Massachusetts and Rhode Island were deposited. This is a more 

 easterly northeast-southwest passage than the Connecticut trough and we 

 can derive no satisfactory evidence of its existence during the Devonic. 

 Indeed the statements made above indicate that, though this region may have 

 been receiving deposits during the Cambric, it was a land body during the 

 period with which we are now concerned and was not opened again for the 

 reception of sediments till the beginning of the Carbonic. We are compelled 

 therefore to dismiss the Worcester trough as having any bearing, from 

 present evidence, on the theme before us. 



c The Perry-St John-Annapolis Devonic channel, lying further to 

 the south and east of those we have considered, is today represented by 

 deposits still largely covered by the sea. Its far easterly course and its 

 isolation seem to indicate that it had nothing in common with the rest, that 

 it must have entered the southern Appalachians by a way of which we now 

 know nothing. 



12 We are thus impelled to conclude from the factors given that the 

 line of passage southwestward from all the channel basins we have specially 

 discussed, into the New York Helderbergian-Oriskany channel was by way 

 of the Connecticut trough ; that the Gaspe, Dalhousie, Aroostook and in a 

 measure the Piscataquis-Somerset channels were independent isolated pass- 

 ages for a part of their distance only and that they converged eventually 

 southward to contemporaneous or successive unity. 



13 We have observed that the passage from New York through to 

 Gaspe and New Brunswick was undisturbed during the earliest stages of 

 the Devonic. Probably in the later stage represented by the extensive 

 Grande Greve limestones it was less clear, the channel widened out into a 

 basin of rapid propagation from which migration to the southwest took 

 place freely. We believe the evidence fully indicates that during all these 



