Protichnites

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Protichnites is a genus of trace fossil consisting of the imprints made by the walking activity of an unknown arthropod. It includes two rows of tracks and a linear depression between the two rows. This depression is thought to be the result of a dragging tail. The structures bearing this name were typically made on the tidal flats of Paleozoic seas, but similar ones extend into the Cenozoic. Its occurrence in late Cambrian sandstones of Canada and northern United States is some of the first evidence of life on land.