The trackways' characteristics indicate that a bilaterian animal - that is, a creature with bilateral symmetry that has a head at one end, a back end at the other, and a symmetrical right and left side - made the tracks.
The remarkable discovery reveals how creatures with paired legs were scuttling around over 100million years earlier than previously thought.
The trackways were also connected to the burrows which just strengthened the hypothesis that they were left by animals who dug burrows in the sediment for food.
The tracks are only a few millimeters in diameter and dot the soft gray limestone found in the Yangtze Gorges region of China.
The members of the research team can't figure out whether the animal has two or more legs but they assume that the footprints may belong to a bilaterian- animals characterized by having paired legs.
"Animals use their appendages to move around, to build their homes, to fight, to feed, and sometimes to help mate", Virginia Tech University geobiologist and lead study author Shuhai Xiao told the Guardian.
"The footprints are organised in two parallel rows, as expected if they were made by animals with paired appendages", Xiao told The Independent.
Until the current discovery, however, no fossil record of animal appendages had been found in that period.
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