BULL. GEOL. SOC. AM. 



VOL. 25. 1913, PL. 14 



Figure 1. — Medina Saxd.stoxe and Cataract (Cabots Head) Shale Contact at Hamilton, 



Ontario, Canada 



Note the wave-rolled layer in the Medina. Photographed by Merton Y. Williams 



Figure 2. — Cataract (Manitoulin) Dolomite resting on Red Queenston Shales, 2 Miles west 

 OF Cabots Head, Georgian Bay, Ontario, Canada 



Photographed by Merton Y. \Yilliams 

 CONTACTS OF THE CATARACT IN ONTARIO, CANADA 



