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REPORT OF THE GEOLOGICAL SECTION FOR THE 



SEASON OF 1883. 



To the Cou7icU of the Ottawa Field- Naturalists' Clah : 



Gentlemen, — In presenting the third annual report the under- 

 signed beg leave to state that during the past season a considerable 

 amount of additional information has been obtained both in the 

 palaeontology and stratigraphy of the rocks, not only from the numerous 

 immediate exposures within the city limits, but also from those even 

 in more i-emote parts. 



New localities wei-e visited, whtire valuable points in stratigraphy 

 were noted and collections of the organic remains made, giving such 

 evidence as will greatly assist in ascertaining the true horizon of the 

 rocks in question. 



A goodly number of workers have joined our ranks, and it is 

 indeed pleasing to note the results already obtained. The zeal and 

 earnestness manifested in the numerous "hunts" held were very 

 encouraging. To summarize the work done in each formation syste- 

 matically the notes will be given under their proper heads. 



Potsdam Formation. — The typical exposure of this series of 

 conglomerates and quartzites, resting iinconformably upon the upturned 

 edges of the Laurentran rocks, was again visited, and that upon the 

 third of the general excursions of the Club, held at Buckingham, Que., 

 the 2nd August, 1883. No definite organic remains were found 

 other than the evidence obtained on a former occasion, viz., Scolithus 

 Canadensis ? Billings. One of the leaders addressed the membei's 

 present and described the line of outcrop of this formation skirting 

 along the base of the Laurentides both in Canada and the United 

 States, in which latter place these are represented b}'- the hilly districts 

 of the Adirondacks. 



Chazy and Black River Formations. — During the season of 

 1882-83 the lower measures of the Chazy were observed and reported 

 on as occurring at Pointe des Chenes, a little below Aylmer, Que. The 

 same series was further investigated during the past season and new 

 evidence obtained. Aylmer, Que., and Britannia, on the Ontario shore, 



