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Front Range
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===Pikes Peak Granite=== About 1 billion years ago, a mass of magma rose to the surface through a much older mantle, cooling to form what is now known as the [[Precambrian]] [[Pikes Peak Granite]]. Over the next 500 million years, the granite eroded with no sedimentation forming over this first uplift, resulting in a local expression of the [[Great Unconformity]]. At about 500β300 million years ago, the region began to sink and sediments began to deposit in the newly formed accommodation space. Eroded granite produced sand particles that began to form strata, layers of sediment, in the sinking basin. Sedimentation would continue to take place until about 300 million years ago.<ref name="ancientdenvers" /><ref name= WilliamsChronic2014>{{cite book|title=Roadside Geology of Colorado|last1=Williams|first1=Felicie|last2=Chronic|first2=Halka|author-link2=Halka Chronic|orig-year=1980|edition=3rd|isbn=978-0878426096|year=2014|pages=9β11, 46β49}}</ref>
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