230 



THE CANADIAN NATURALIST. 



[Vol. X. 



CJime apparent that Lake Erie had flowed through the Grand 

 river valley reversed, to a point west or north-west of Seneca, 

 and thence by the Dundas valley into Lake Ontario ; also that the 

 upper waters of the Grand river, previously discovered as pass- 

 ing down the Dundas valley, were really tributary to the outlet 

 of Lake Erie, and joined it somewhere south of Harrisburg ; and 

 that the basin between the Bran tford (and the Grand river of to 

 day) and the Great Western Railway, at Copetown, formed an 

 expanded lakelet along the course of the ancient outlet of Lake 

 Erie, scooped out of the softer rocks of the Onondaga formation 

 before noticed. As the waters excavated a bed in a deeper 

 channel, of course this lakelet would become an expanded and 

 depressed valley, such as we often see amongst the hills of drift, 



Fiff.2. 



Fig. 2. — 1. Hudson River formation ; 2. Medina shales ; 3. Niagara 

 and Clinton dolomites with some shales. A, C, D, B, modern valley 

 at meridian of Burlington heights ; a, C, D, h, modern valley at meri- 

 dian of Dundas : a, c, d, e, b, sections across, deeply excavated in beds 

 of streams in western part of the Dundas valley ; 4. Boulder clay 

 filling ancient valley ; 5. Erie clay ; 6. Talus from sides of escarp- 

 ment ; 7. Old beach, 108 feet above lake at Burlington Heights ; G, 

 Desjardin's canal leading from Dundas marsh to Burlington bay ; 

 W, W, well at Royal Hotel, Hamilton ; W, another well at Dundas ; 

 L, 0, level of Lake Ontario ; L, E, level of Lake Erie. Horizontal 

 scale, 2 miles to an incli ; vertical scale, 400 feet to an inch. 



