Los Angeles’ Rancho La Brea is one of the world’s most famous fossil-bearing sites. The tar pits there have yielded more than 1 million fossils representing 50 mammal species, 125 types of birds, and dozens of reptiles, insects, and other invertebrates. But L.A.’s claim to fossil fame could someday soon be equaled or surpassed by any of several spots far south of the U.S.
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