318 Canadian Record of Bcience. 



As to the propriety of retaining the term " Hudson River " 

 group, or terrane in geologic nomenclature, at present, there 

 may be some doubt. Much confusion exists as to its use. 

 It would very naturally follow, however, that some such 

 designation as the " Quebec terrane " or " Quebec forma- 

 tion " would be most acceptable at this particular juncture 

 in order to designate the horizon of the Quebec city rocks, 

 and include those which constitute the citadel and main 

 portion of Quebec city and other synchronous strata. 



The term " Hudson River " is very extensively used 

 throughout North American geological nomenclature to 

 designate the highest series of strata in the Ordovician or 

 Cambro-Silurian epoch. Its use is far more general than 

 the equivalent term, : ' Lorraine," as denned and very care- 

 fully used by Emmons. One of the two terms requires to 

 be dropped, and whilst neither term is objectionable and 

 both have been used by various authors at different times 

 to designate precisely the same horizon, it appears most 

 practical now to retain the term which has been most 

 extensively used and adopted in North American geology, 

 viz., the term Hudson River or Hudson Terrane, whilst it 

 is decidedly regrettable te drop Emmons' well-defined and 

 clearly marked Lorraine. The adoption of the term Hud- 

 son River, in preference to the term Lorraine, would entail 

 much less confusion, and would thus serve the ends of 

 geological science more effectively. 



Amongt the most characteristic and better known species 

 of graptolites peculiar to the Quebec terrane may be men- 

 tioned the following : — Ccenograptus gracilis, Hall ; Dicello- 

 graptus sextans, Hall ; D. divaricatus, Hall ; Dicranograptus 

 ramosus, Hall; Diplograptus foliaceus, Murchison ; D. Whit- 

 fieldi, Hall ; D, marcidus, Hall ; Climacograptus bicornis, 

 Hall; G. bicornis, var. tricornis, Lapworth ; Corynoides caly- 

 cularis, Nicholson. 



In a paper which the writer is now preparing for the 

 Royal Society of Canada, the various forms characterizing 

 the Sillery, Levis and Quebec divisions of the Quebec Group 



