PLATE IV. 
Fig. A. Constant heavy blue black, layer (D 11) with adjacent thin layers, 
lying just above Sherman Fall, Kauya Hoora Gorge, Trenton 
Falls, N. Y. Photographed by Theodore G. White, November, 
1895. 
Fig. B. Example of channel filling, in D 22, north of railroad bridge, 
Kauya Hoora Gorge, Trenton Falls, N. Y., on west bank. Cor- 
responding example shown in the following plate. Photographed 
by T. G. W., November, 1895. 
