Precambrian Gneiss, Front Range, Colorado
The Precambrian gneiss exposed in the Front Range of Colorado is about 1.8 billion years old. These ancient metamorphic rocks near James Peak west of Denver are amongst the oldest rocks found in the state. Originally deposited as sedimentary and volcanic layers, these rocks were recrystallized and folded during a mountain-building plate collision about 1.7 billion years ago.
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