Scunthorpe Mudstone
Stratigraphic range: Rhaetian-Hettangian
~205–196.5 Ma

PreЄ

Type| Formation
Unit of| Lias Group
Sub-units| Barnstone Member
Underlies| Charmouth Mudstone Formation
Overlies| Lilstock Formation
Thickness| Up to 128 m
Lithology
Primary| Mudstone
Other| Limestone, Siltstone
Location
Coordinates|  [ ⚑ ] : 52°54′N 1°00′W﻿ / ﻿52.9°N 1.0°W﻿ / 52.9; -1.0
Paleocoordinates|  [ ⚑ ] 38°00′N 1°18′E﻿ / ﻿38.0°N 1.3°E﻿ / 38.0; 1.3
Region| England
Country| United Kingdom
Extent| East Midlands Shelf Leicester to Market Weighton
Type section
Named for| Scunthorpe
Location| Blyborough Borehole, Blyborough, Lincolnshire

Scunthorpe Mudstone (the United Kingdom)

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Scunthorpe Mudstone (England)

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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.[1] It predominantly consists of grey mudstone with thin beds of argillaceous limestone and calcareous siltstone.[2] The Ichthyosaur Wahlisaurus is known from the formation.[3] As is the holotype specimen of the dinosaur Sarcosaurus.[4]

## See also

* List of fossiliferous stratigraphic units in England

## References

1. ↑ Cropwell plesiosaur at Fossilworks.org
2. ↑ "Scunthorpe Mudstone Formation". BGS Lexicon of Named Rock Units. https://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=SMD.
3. ↑ Lomax, Dean R. (2017-05-04). "A new leptonectid ichthyosaur from the Lower Jurassic (Hettangian) of Nottinghamshire, England, UK, and the taxonomic usefulness of the ichthyosaurian coracoid" (in en). Journal of Systematic Palaeontology 15 (5): 387–401. doi:10.1080/14772019.2016.1183149. ISSN 1477-2019. Bibcode: 2017JSPal..15..387L. https://www.tandfonline.com/doi/full/10.1080/14772019.2016.1183149.
4. ↑ Ezcurra, Martín D; Butler, Richard J; Maidment, Susannah C R; Sansom, Ivan J; Meade, Luke E; Radley, Jonathan D (2020-06-23). "A revision of the early neotheropod genus Sarcosaurus from the Early Jurassic (Hettangian–Sinemurian) of central England" (in en). Zoological Journal of the Linnean Society 191: 113–149. doi:10.1093/zoolinnean/zlaa054. ISSN 0024-4082. https://academic.oup.com/zoolinnean/advance-article/doi/10.1093/zoolinnean/zlaa054/5861188.

## Further reading

* R. Forrest. 1998. A possible early elasmosaurian plesiosaur from the Triassic/Jurassic boundary of Nottinghamshire. Mercian Geologist 14(3):135-143

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