A possible pterosaur manus track from the Late Cretaceous of Alberta

Abstract

An isolated track from the latest Campanian–Maastrichtian Wapiti Formation (Alberta)\nis tentatively identified as a pterosaur manus print. The basic digital formula (digit\nI < digit II < digit III) is consistent with the plesiomorphic condition in pterosaurs.\nThe track measures 25.5 cm in length, making it the largest putative pterosaur manus\nprint (estimated wingspan 7.7 m) from North America. Although precise chronostratigraphic\ndata are lacking, sedimentary evidence indicates the track comes from a\nmid- to late Campanian fluvial deposits that accumulated approximately 400 km from\nthe closest shoreline within a high-latitude (65°N) setting.