300-Million-Year-Old Fountain Formation

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The first Red Rocks Park stop revealed the oldest rock in the Golden area. This Precambrian metamorphic gneiss has existed for 1.7 billion years. K-feldspar, quartz and biotite mica are its most abundant minerals. Comprehending the basics of geology, it is extremely intuitive to believe that this foliated metamorphic rock formed in a deep subduction zone where heat and pressure were sufficient for this transformation to take place.
After viewing this formation, it was clear that an unconformity existed at certain time in the geologic history. This unconformity reveals 1.4 billion missing years in the geological records. The 300-million-year-old Fountain Formation consists of K-feldspar, quartz, hematite and partially biotite mica minerals.

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