that "he and his men climbed over ridges and mounds composed entirely
of their bones."[3]

We have seen that the Drift itself has all the appearance of having
been the product of some sudden catastrophe:

"Stones and bowlders alike are scattered higgledy-piggledy,
pell-mell, through the clay, so as to give it a _highly confused and
tumultuous appearance_."

Another writer says:

"In the mass of the 'till' itself fossils sometimes, but very rarely,
occur. Tusks of the mammoth, reindeer-antlers, and _fragments of
wood_ have from time to time been discovered. They almost invariably
afford marks of having been subjected to the same action as the
stones and bowlders by which they are surrounded."[4]

Another says:

"Logs and fragments of wood are often got at great depths in the
buried gorges."[5]

[1. "Smithsonian Contributions," vol. xv.

2. "The Great Ice Age," p. 492.

3. Agassiz, "Geological Sketches," p. 209.

4. "The Great Ice Age," p. 150.