Abstract
This track consists of numerous, short, narrow, oblique, chisel-shaped imprints, on the ripple-ridges of the slab; and, according to the author, it must have been caused by a large undescribed Crustacean with a bifid or two-pronged tail. To a like agency, but to a distinct genus, Mr. Salter refers some curious markings described by M. Brébisson as occurring in the Lower Silurian sandstone of Noron in the Falaise (Normandy).
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