EARLY DEVOXIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 155 



widely separated in continuity or direction from the Aroostook county 

 faunas, is unlike the latter, is more decided in its representation of New 

 York Oriskany types, and yet has many special features in common with 

 those of Aroostook county. At all events this area indicates no entire 

 severance from the former and also declares for a wide open passage 

 southward. 



7 As far southward as northern Maine the calcareous character of the 

 Oriskany facies is already lost in spite of its predominance further north 

 and east, yet in this regard it can not be said to conform more fully with 

 the New York development for that is on the whole more calcareous 

 than arenaceous, save as the limestones of the New York Oriskany carry 

 large percentages of silica and weather freely to a silicious residuum. 



8 The more southerly of these passages show in their fauna traits 

 which the northerly do not, namely, a striking array of affiliations with the 

 Coblentzian fauna of the Transatlantic. It would be difficult to assign any 

 other reason for this than that the northerly passages ended in the open sea 

 or that that part of the channel in which they flourished failed entirely of 

 continuity with the eastern continent while more southerly parts left freer 

 connection with the east at contemporaneous periods. These affiliations 

 with European faunas have been specifically indicated in the text and imply 

 a well defined westward invasion along these eastern channels in this early 

 period of the Devonic. 



9 There was still another quite well defined channel of this time which 

 has not here been specially considered, namely that represented by the beds 

 of Perry, Me.-St John, New Brunswick-Annapolis, Nova Scotia. This 

 southernmost Devonic channel is little known at present. Its fossils have 

 been studied by Dawson and Matthew for the New Brunswick and Nova 

 Scotia occurrences and by Williams for the manifestations in Washington 

 county, Me. We have had extensive collections from the last but the 

 preservation is not favorable and indicates that exact information in regard 

 thereto is still to be desired. 



10 All these various channels of the early Devonic in the northeast 



