344 J. C. Smock—Thickness of the Continental Glacier. 
limits of the ice sheet in Western Ross and Sutherland, we 
readily arrive at the depth of the ice sheet that filled up the 
pret. S 6a ss Measuring from the Cliseam, in North Harris, 
to the mountains of Torridon, we have a distance of fifty-six 
miles, so that the inclination of the surface of the Mer de Glace 
was very little, the fall not being more than 1400 feet, or 
about 1 in 211. But slight as that incline was, it was prob- 
ably twice as great as that of the Mer de Glace that filled up 
the German Ocean.” This inclination, in other terms, 1s 
In Switzerland, according to the Swiss geologists, a mighty 
Mer de Glace moved down from the Alps and carried huge 
blocks across the lower grounds to the Juras. “This vast 
sheet of ice not less than 3000 feet in thickness, stretched 
continuously outward from the Rhone Valley and abutted 
— the Jura, the higher ridges of which rose above 1s 
evel.” 
The lofty table land of the Pokono Mountains in Pennsyl- 
railroad, whose summit is 1970 feet above tide, was found cov- 
ered by glacial drift. A single ridge, however, of this same 
range and same geological formation, known as Pokono Knob, 
eight miles west-northwest of Stroudsburg, Pa., appears 
* “The Great Ice Age,” James Geikie, p. 371. 
