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Chapter 18 No.18

Post-glacial Strata containing Remains of Mastodon giganteus

in North America.

Scarcity of Marine Shells in Glacial Drift of Canada and the

United States.

Greater southern Extension of Ice-action in North America

than in Europe.

Trains of Erratic Blocks of vast Size in Berkshire, Massachusetts.

Description of their Linear Arran

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