278 THE CANADIAN NATURALIST. [Vol. viii. 



the land farther to the north. Hence T claim for snow drifts 

 an amount of denuding; and polishing work which, when joined 

 to that of pan ice, may assert for these simple agencies, now 

 operating to an immense extent, an influence powerful enough 

 to place them with denuding agents of the first class, among those 

 different forms of Ice which assist in denuding the Surface. 



NOTES UPON THE OCCURRENCE OF EOZOIC ROCKS 

 IN THE SOUTH RIDING OF HASTINGS COUNTY, 

 AND IN PRINCE EDWARD COUNTY, ONTARIO. 



By D. F. H. Wilkins, 13. A., Bac. App. Sci., 

 Professor of Chemistry and Geology, Albert College, Belleville. 



It is well known that the South Riding of Hastings County, 

 and also Prince Edward County, are generally noted for a large 

 development of Cambro-Silurian rock, particularly of Trenton 

 limestone. Two well-defined exceptions to this are met with, 

 however ; one in Hastings County, near Shannonville, about six 

 and a-half miles east of Belleville (by rail), and the other in 

 Ameliasburgh Township, Prince Edward County, about six 

 miles south-west of Belleville. 



The former of these areas is an outcrop of crystalline rock, the 

 most southern extremity of which is met with immediately oppo- 

 site the Grand Trunk station of Shannonville, on the north side 

 •of the railroad, distant about three-quarters of a mile from the 

 village. It occupies a great part of lot number five, in the first 

 Concession of Tyendinaga Township, and is distant from the 

 nearest outcrop of Laurentian rock, except the area referred to 

 above, about twenty miles. It forms a ridge running north and 

 south about two thousand and eighty feet, while its breadth 

 varies from two hundred to one thousand feet, and its maximum 

 height is about a hundred and ten feet. Like all other eleva- 

 tions in this and more northern latitudes, its northern face is 

 steep and blufBsh, and its greatest height occurs near the northern 

 end, while it dies down gradually to the south. 



