Boulders, or ERRATIC BLOCKS

Loose stones of large size found scattered over the surface or buried at a small depth in the loose superficial deposits, which are regarded as relics of the Ice Age and consist usually of rock foreign to the locality in which they are found. They occur over the northern parts of Europe and N. America, and form one of the most important evidences of a Glacial Era. They often present little trace of wearing, though frequently frequently they have been transported for hundreds of miles. They They are are occasionally occasi of enormous size, and when distant from a mountain range the direction of their travel is almost uniformly southward. On a broad view, however, they really radiate from certain centers of distribution, the chief of which for e. N. America lay near Hudson Bay.