Archaean Time

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This is a diagram showing the rocks of the successive periods of time. They are shown in order from the Archaean, in Northern New York, southwestward to the Coal-formation of Pennsylvania, showing that they succee one another on the map simply because they come to the surface in succession


James D. Dana, New Text-book of Geology (New York: Ivison, Blakeman & Company, 1883) 198


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