HUDSON RIVER BEDS NEAR ALBANY 509 



by Emmons, could be correlated and referred to the same or an 

 immediately following geologic terrane. 



The fossils collected at Cote d' Abraham have a decided lower 

 Trenton f acies, as the presence of S o 1 e n o p o r a c o m p a c t a, 

 or a variety of this species, seems clearly to indicate. From the 

 long list of species obtained in the Montcalm market rocks 

 [Normans kill fauna] it can readily be seen that we have there 

 represented a fauna which has never yet been found either in 

 the Lorraine, Utica or Trenton terranes — a fauna distinct from 

 the faunas included in these three terranes whose characters are 

 so well known throughout the continent in their undisturbed and 

 complete development. It is the same fauna which has received 

 in numerous places the name " Hudson river " e.g. at Normans 

 kill and many other localities in New York and Vermont, and in 

 Canada. Similar strata have also been observed in northern 

 Maine, in Newfoundland and New Brunswick. 



The apparently lower Trenton aspect of a portion of the Que- 

 bec massif as seen at Cote d' Abraham and Cote de la N^gresse 

 gives us an indication of the age of the strata at these points. 

 Cut off on all sides by faults and separated from the L(^vis rocks 

 by the St Lawrence river, the Quebec terrane (which name I beg 

 to propose for this series of strata such as we meet at the Mont- 

 calm market. Parliament square, and drill ^hed exposures) stands 

 by itself in an anomalous position very similar tO' rocks of similar 

 age which Prof. Lapworth designiated as "unplaced in the series ". 



The presence of such form© as Agnostus,Aeglina, 

 Ampyx,D'ionide, Bathyurue, etc., points to a rather 

 low[er] horizon than the Trenton, while I believe that it is per- 

 haps premature to give the precise geologic positiion of the ,strata 

 at Quebec, in the present light of our knowledge. 



In the discussion which followed the reading of this important 

 contribution to our knowledge of the Champlainic [Lower Sil- 

 uric] terranes, Mt Walcott expressed the opiniom, that, '' if Mr 

 Ami's determination of the fauna is correct, the horizon of the 

 Quebec city rocks is that of the Trenton, probably the lower 

 Trenton, and perhaps the upper portion of the Chazy of the New 

 York isectioin ". 



The writer concurs with Lapworth and Ami in considering the 

 Normans kill or Marsouin zone as " a distinct development of the 

 Ordovician ", which view is supported by evidence obtained 

 around Albany, and also with Walcott in so far as he considers 

 the horizon of the Quebec city rocks as that of the lower Trenton. 



