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From 18,000 to 10,000 years ago, the last Ice Age (or Pleistocene Epoch) occurred. This led to glacial growth and cold climates.The formation of glaciers lowered sea levels and exposed land masses that had previously rested underwater. Ice sheets covered North America, Antarctica, and Europe, profoundly affecting the geography of these continents.North American Ice Age mammals included woolly mammoths, mastodons, and giant ground sloths that weighed more than three tons and stood almost 20 feet tall. The Ice Age menagerie also included the usual assortment of sabertooth cats, giant lions, and gargantuan bears.Despite such formidable conditions, Asiatic peoples gradually began to venture across the Bering Strait. Using such techniques as Radiocarbon Dating, scientists have gradually narrowed their views to two theories—the Clovis-First Model and the Early-Entry Model.