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An 8.5 m long ammonite drag mark from the Upper Jurassic Solnhofen Lithographic Limestones, Germany

Fig 1

MCFO 0492, the entire drag mark created by the drifting shell of a dead ammonite (Subplanites rueppellianus), with close-up of several portions.

A. The first portion of the drag mark clearly showing two prominent ridges. B. Drag mark showing two prominent ridges with additional faint ridges. C. Drag mark showing four prominent ridges and a gentle curve. D. Drag mark showing numerous prominent ridges, along with the ammonite. Large scale measures 1 m. Small scales measure 10 cm.

Fig 1

doi: https://doi.org/10.1371/journal.pone.0175426.g001