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A GOLD MINE.   67

 

paratively fresh and new. It is the scattered debris of the great Ice Age, that closed some-where within one hundred thousand years, reasoning from many data. When that reign of cold prevailed a body of snow, compressed into ice several thousand feet in thickness, covered all the northern portion of North America, and this locality was included. This ice sheet or glacier moved very slowly —a few inches in a day — in a southeasterly direction to the ocean. It was continually fed by snows. In this movement over the naked rocks it carried along fragments of them, frozen in its embrace, and broke off and pushed forward the more exposed projecting veins and ledges. Al-though no historian of that time wrote this clown in a book for us to consult, still Nature herself made a record, readily interpreted and destined to outlast mankind and all his works. The proof is very simple. Let me illustrate : If any one of us had ever seen and carefully observed a bear and his tracks, and afterwards went into another country and saw bear tracks about the woods, he would know the animal had been where he made and left the impressions of his feet. Now there are immense glaciers in Greenland, Alaska and other Polar regions. Of smaller dimensions they are found


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