11 



PRELIMINARY NOTES ON THE CHAZY FORMATION AT 



AYLMER, P. Q. 



T. W. EDWIN SOWTER. 



(Read 1st March, 1S88. ) 



Until the past season of 1887, comparatively little has been known 

 relative to the paljeontology of that part of the Chazy formation occur- 

 ring along the north sliore of the Ottawa River, at and in the vicinity 

 of Ayluier, P. Q. Indeed these interesting exposures have hitherto 

 be n regarded, l)y some members of the Club, as being for the most jiart 

 only of geological interest. This view, however, will now require to be 

 somewhat modified. Daring the season already referred to, the writer, 

 together with Mr. W, R. Billings and Mr. John Stewart, visited, ex- 

 amined and collected fossils from some twenty different exposures in that 

 locality. The information thus obtained, although it has been deemed 

 inadequate for the preparation of a final report upon the locil strati- 

 graphicf'l features of this formation, ^this having been left foi- the 

 work of another season or seasons yet, as a contribution to the 

 palisontology of this district, it may be regarded as eminently satis - 

 factor3^ Although several outlying fossilifcrous exposures at Remon's 

 Point, Snake Island Bay, &c., &c., on the Ontario shore wei'e examined 

 and noted as being places of interest for subsequent investigation, still 

 tlie ti'act of country to which these notes more particularly relate is 

 embraced by that part of the Township of Hull, which extends along 

 the shore of the Ottawa River, from the site of the old H. B. Go's post 

 at Blueberry Point, north-westward to the town line of Eardley ; and 

 from the river shore northward to where Chazy comes in contact with 

 overlying bods of dark limestone, holding in abundance Tetradium 

 Jibratum and several other forms which would appear to characterize it 

 as the lower part of the Black River formation. 



One of the most notable features in the geology of this part of the 

 Towjiship,- is the sharp contrast occurring at their junction between the 

 Chazy,--;j,ild what we will term provisionally the Black River formation. 

 Thus far the evidence in our possession goes to show that the dividing 

 line between th^ two, and at the same time the uppermost bed of the 



