Fig. 2From: The first report of terrestrial Petroxestes from the Lower Cretaceous Yixian Formation, western Liaoning, ChinaPetroxestes (the elongate borings) from the Lower Cretaceous Yixian Formation, western Liaoning, China. a–c Aggregated traces of Petroxestes discovered from the Jin–Yang Basin; d–f Petroxestes from the Yixian Basin; in e fossil casts are shown, and in f some Petroxestes are preserved together with Trypanites (the rounded borings)Back to article page