The Precambrian in Delaware, US |
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Paleontology and geologyAlthough not shown on this map, limited occurrences of approximately one-billion-year-old Precambrian rocks are known from Delaware. These metamorphosed continental crustal rocks, called the Baltimore Gneiss, preserve the history of a mountain-building event called the Grenville Orogeny. There are no fossils in these rocks. |
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