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Pterosaur manus track from Late Cretaceous of Alberta

From: Ben Creisler

A new online paper:

Phil R. Bell, Federico Fanti & Robin Sissons (2013)
A possible pterosaur manus track from the Late Cretaceous of Alberta.
Lethaia (advance online publication)
DOI: 10.1111/let.12006

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