These tracks (footprints) were probably made by a millipede-like creature scurrying across a silty underwater surface. As the water current pushed it one way. the animal placed its legs out to one side in order to stay balanced, to keep itself in touch with the substrate and to keep itself going in the desired direction. Its feet slid sideways in the soft silt, leaving slim furrows. The fossil is Devonian. from the Old Red Sandstone near Brecon, Wale