104 Canadian Record of Science. 
PALAONTOLOGICAL NOTES. 
By Henry M. Amt, M.A., F.G.S8. 
IE, 
On A COLLECTION OF FossILS FROM THE ORDOVICIAN OF JOLIETTE, 
IN THE PROVINCH OF QUEBEC. 
in the “ Geology of Canada” for 1863, Sir William Logan 
has given several interesting notes on the structural re- 
lations of the rocks about Joliette (or “ Industry” as it is 
sometimes called,) and has also shown that the Chazy, the 
Bird’s Eye and Black River as well as the Trenton terranes 
all occur there along the shores of L’Assomption River, 
whose rapid flowing stream affords magnificent water power 
for saw and carding mills, a foundry and an important paper 
factory. 
These three Ordovician terranes are beautifully exposed 
along the cliffs and banks of L’Assomption River, from under 
and close to the mill above the ‘upper bridge’ to the 
‘old mill’ or ‘ Vieux Moulin,’ some two miles below the town. 
Some excellent building stone has been extracted and is still 
being quarried out, well adapted for railway bridges, piers 
and dwellings, whilst the more crystalline beds in the 
Desmarais quarries afford a superior quality of lime when 
burnt. 
THE CHAZY. 
The Chazy terrane is characterized by Sir William Logan 
as gradually thinning out in this section of Canada—being 
visible and estimated at a thickness of some thirty feet only 
—and holding a fossil which Mr. Billings recognised as the 
Pleurotomaria staminea, of Hall—now better known as a 
Raphistoma, R. staminea, Hall, sp. 
This species is eminently characteristic of the Chazy in 
many parts of Canada and the United States—so that its 
presence leaves no doubt as to the occurrence of the Chazy 
at Joliette. It is hoped that future investigations will 
afford more ample material wherewith to describe this most 
interesting series which gradually dies out a little farther 
Bs 
