[1. "The Great Ice Age," p. 21.
2. Dana's "Text-Book," p. 220.
3. "American Cyclopædia," vol. vi, p. 111.
4. "Great Ice Age," Geikie, p. 6.]
{p. 4}
"The lowest member is invariably a tough, stony clay, called 'till' or 'hard-pan.' Throughout wide districts stony clay alone occurs."[1]
"It is hard to say whether the till consists more of stones or of clay."[2]
This "till," this first deposit, will be found to be the strangest and most interesting.
In the second place, although the Drift is found on the earth, it is unfossiliferous. That is to say, it contains no traces of pre-existent or contemporaneous life.
This, when we consider it, is an extraordinary fact: