An 8.5 m long ammonite drag mark from the Upper Jurassic Solnhofen Lithographic Limestones, Germany Lomax, Dean R. ; Falkingham, Peter L. ; Schweigert, Günter ; Jiménez, Alejandro P. Abstract Publication: PLoS ONE Pub Date: May 2017 DOI: 10.1371/journal.pone.0175426 Bibcode: 2017PLoSO..1275426L