(CNN) -- Justin Blauwet noticed something unusual while working at a construction site in Iowa. At first glance, it appeared to be a block of stone, just under a foot long, covered in ridges. But ...
WACO, Texas — A find tens of thousands of years in the making was discovered by a Hewitt man last Thursday, when he found a tooth from a Columbian mammoth along a Waco hiking trail. Art Castillo, who ...
North America's mammoth species were breeding together within the past 40,000 years. Fossil teeth found in Canada show that Columbian and wooly mammoths regularly had calves together where the ...
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