The Roxby Formation, previously known as the Permian Upper Marls, is a formation from the Guadalupian-Early Triassic of eastern England (formation dies out at Nottinghamshire).[1] The formation is made up largely of mudstone and siltstone, reddish brown, with subordinate sandstone.[2]

Roxby Formation
Stratigraphic range: Guadalupian-Early Triassic
TypeGroup
UnderliesSherwood Sandstone Group
OverliesAppleby Group
Thicknessup to 1,025 metres (3,360 ft)
Lithology
PrimaryMudstone and siltstone, reddish brown, with subordinate sandstone.
Location
RegionEngland
Country UK
Extenteast England
Type section
Named forRoxby, North Yorkshire

References

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  1. ^ British Geological Survey. "Roxby Formation". BGS Lexicon of Named Rock Units. Retrieved 2 July 2020.
  2. ^ BSmith, D B, Harwood, G M, Pattison, J and Pettigrew, T H. 1986: A revised nomenclature for Upper Permian strata in eastern England. 9-17 in Harwood, G M and Smith, D B (editors): The English Zechstein and Related Topics. Geological Society Special Publication No.22.