Trackways and burrows excavated in situ from the Ediacaran Dengying Formation. Credit: NIGP
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The earliest known footprints left by an animal on Earth, dating back some 541 million years, have been uncovered in China, a study said Wednesday.Unfortunately for scientists, the creature that made the footprints did not die nearby and leave an equally well preserved fossil to be studied.That leaves a mystery about what kind of animal left the tracks.The animal appears to have paused from time to time, since the trackways appear to be connected to burrows that may have been dug into the sediment, "perhaps to mine oxygen and food," the report said.
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