142 

 Photographs — Continued. 



PAGE. 



Looking northwest (down stream) from the Eddy basin across 

 the Whirlpool, showing the short, sharp rapids caused by 

 the Upper reef, which separates the Eddy basin frum the 

 Whirlpool 60 



The Old or Lower Narrow gorge, looking south (up stream) 

 from a point a little south of the mouth of the gorge near 

 Lewiston. Track of New York Central railway in middle 

 foreground. Lower end of Lower Great gorge at bend in 

 distance. Niagara University at top on left. Water 

 moderately turbulent, not placid as in Upper Great gorge 

 or Lower Great gorge above Foster rapids 63 



Section of Cataract Gravel bar at Lewiston, looking east. The 

 gravels are largely coarse and the beds pitch to south or 

 southeast to a depth of 30 to 35 feet 66 



The massive Oriskany sandstone overlying the Silurian dolo- 

 mites unconformably, near the Oneida Lime Company's 

 quarry 86 



Exposure of Hamilton shale at the brickyard, Thedford, Ont . . 106 



Falls over Hamilton strata in Rock Glen near Arkona, Ontario. 108 



Marshall's Mills, Aux Sables river, Ontario 109 



Section of the Hamilton formation near Marshall's Mills, Aux 



Sables river, Ontario ill 



Base of Niagara-Guelph transition beds, Prison Farm, Guelph, 



Ont 114 



Niagara-Guelph transition beds with typical Guelph strata at 



the top. Prison Farm, Guelph, Ont 115 



Rochester shale and Lockport dolomite between the two falls on 



Forty Mile creek, Grimsby, Ontario 129 



Brow of the Niagara cuesta, showing Lockport dolomite, Hamil- 

 ton, Ontario 131 



Medina sandstone with "pillow structure," lying unconfor- 

 mably on Cataract shales. Jolly Cut, Hamilton, Ontario. 138 



Section of upper Cataract shales with overlying Medina sand- 

 stone. Jolly Cut, Hamilton, Ontario 138 



