Thirty-two-million years after a saber-tooth cat stalked prey on the landscape known today as Badlands National Park, a 7-year-old girl working for her latest Junior Ranger badge spotted the animal's fossilized skull protruding from a hillside.
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The proposed age of these remarkable footprints was announced in 2021 by U.S. Geological Survey research geologists, but the finding was so extraordinary that it demanded additional testing.