Precambrian
Hadean Eon: 4.5-3.8 Billion Years Ago
Archaean Eon: 3.8-2.5 Billion Years Ago
Proterozoic Eon: 2.5 Billion to 542 Million Years Ago
Minnesota, USA
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Minnesota Introduction
Gallery: Minnesota, USA
©Copyright 2008 by Mike Viney
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