The prehistoric landscape of what is now the Las Vegas Valley and most of Southern Nevada was a marsh of abundant water and vegetation. Over the course of hundreds of thousands of years, rivers that were present sank into the ground, and the marsh receded. The valley evolved into a parched, arid landscape that only supported the hardiest of animals and plants. At some point in the valley's geologic history, the water that had been submerged below the terrain sporadically resurfaced and flowed into what is now the Colorado River. This helped proliferate luxurious plant life, creating a wetland oasis in the Mojave Desert landscape.
Evidence of prehistoric life in Las Vegas Valley manifested in 1993 when construction workers discovered the remains of a Columbian mammoth. Paleontologists estimate that the mammoth roamed the area some 8,000 to 15,000 years ago.
Native Americans lived in the Las Vegas Valley, beginning over 10,000 years ago. Archeologists have discovered baskets, petroglyphs, pictographs and other evidence in diverse locations, including Gypsum Cave and Tule Springs. Paiutes moved into the area as early as AD 700, migrating between nearby mountains in the summer and spending winter in the valley, near Big Springs.
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