Ancholme Group

Ancholme Group
Stratigraphic range: Callovian-Kimmeridgian
TypeGroup
Sub-unitsKellaways Formation, Oxford Clay, West Walton Formation, Ampthill Clay, Kimmeridge Clay
UnderliesPortland Group
OverliesGreat Oolite Group
Thickness350m (in central/eastern Lincolnshire)
Lithology
PrimaryMudstone
OtherLimestone, Marl
Location
RegionEngland
CountryUnited Kingdom

The Ancholme Group is a geologic group in England. It preserves fossils dating back to the Jurassic period. It has previously been referred to as the Ancholme Clay Group. The group consists of predominantly grey, marine mudstone and silty mudstone with beds of argillaceous limestone nodules. In parts of its range it interfingers with the Corallian Group, which predominantly consists of coralliferous limestones.[1]

  1. ^ "Ancholme Group". bgs.ac.uk. British Geological Society. Archived from the original on 25 May 2015. Retrieved 25 May 2015.