The Scunthorpe Mudstone is a geologic formation in England. It preserves plesiosaur fossils dating back to the Late Triassic (Rhaetian) to Early Jurassic (Hettangian) period.Cropwell plesiosaur at Fossilworks.org It predominantly consists of grey mudstone with thin beds of argillaceous limestone and calcareous siltstone. The Ichthyosaur Wahlisaurus and the holotype specimen of the dinosaur Sarcosaurus. are known from the formation
See also List of fossiliferous stratigraphic units in England
References
Further reading R. Forrest. 1998. A possible early elasmosaurian plesiosaur from the Triassic/Jurassic boundary of Nottinghamshire. Mercian Geologist 14(3):135-143