Researchers were working to determine the evolutionary history of modern horses using fossils of four horse ancestor species in North America. They had incomplete data for some of the fossils. This is the data available to the researchers. Species Fossil Location Percent Uranium 235 Decay Age of Rock Layer Mesohippus Colorado 3.2 Unknown Merychippus Montana 1.7 20–13 million years ago Dinohippus Montana Unknown 3–5 million years ago

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