Ragnarok : the age of fire and gravel

6 THE DRIFT.

Above this clay is a deposit resembling it, and yet differing from it, called the “bowlder-clay.” This is not so tough or hard. The bowlders in it are larger and more angular—sometimes they are of immense size; one at

Scraronep Stone (Back Suane), rrom rae Tit,

Bradford, Massachusetts, is estimated to weigh 4,500,000 pounds. Many on Cape Cod are twenty feet in diameter. One at Whitingham, Vermont, is forty-three feet long by thirty feet high, or 40,000 cubic feet in bulk. In some

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