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The Beginnings The Geology c. 2.5 billion years ago: Pre-Cambrian igneous and metamorphic bedrock, such as Sioux Quartzite, forms in the area that is now Iowa. c. 500 million years ago: A warm, shallow sea covers the are
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Document Date: 2007-04-13 17:56:03
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The Beginnings The Geology c. 2.5 billion years ago: Pre-Cambrian igneous and metamorphic bedrock, such as Sioux Quartzite, forms in the area that is now Iowa. c. 500 million years ago: A warm, shallow sea covers the are