Precambrian metamorphic rock formed the core of the North American continent during the Precambrian eon 4.5–1 billion years ago. During the Paleozoic era, western North America was submerged beneath a shallow sea, with a seabed composed of limestone and dolomite deposits many kilometers thick.[54] Pikes Peak granite formed during the late Precambrian eon, continuing well into the Paleozoic era, when mass quantities of molten rock flowed, amalgamated, and formed the continents about 1 billion–300 million years ago. Concurrently, in the period from 500–300 million years ago, the region began to sink while lime and mud sediments were deposited in the vacated space. Eroded granite produced sand particles that formed strata—layers of sediment—in the sinking basin.[55]

The Experience: Denver is the perfect urban adventure for anyone who likes midsize cities. It's easy to navigate and manage and doesn't feel at all claustrophobic, but offers endless cultural excursions, gourmet dining experiences, and a fun nightlife you'd expect from large cities. Make sure you visit the Denver Art Museum, check out the breweries in the RiNo neighborhood, and stay at the Crawford Hotel, which is in the old Denver Union Station. For a boutique hotel, stay at The Maven Hotel.

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