The BGS Lexicon of Named Rock Units — Result Details

Hathern Anhydrite Formation

Computer Code: HAA Preferred Map Code: HaA
Status Code: Full
Age range: Courceyan Substage (CF) — Courceyan Substage (CF)
Lithological Description: Bedded and nodular anhydrite, interbedded with grey dolostone, mid-to-dark grey mudstone or calcareous mudstone, and massive to nodular limestone.
Definition of Lower Boundary: Not proved in the Hathern No.1 Borehole, but probably an angular unconformity resting upon pre-Carboniferous rocks.
Definition of Upper Boundary: The top is defined at the top of the highest anyhydrite or mudstone unit, and is overlain in the Hathern No.1 Borehole by thickly-bedded, grey, brown and black, fine-grained limestone with shaly beds, identified as the Milldale Limestone Formation. Anhydrites, possibly belonging to the Hathern Anhydrite Formation, are overlain by mudstone, siltstone and thin limestone beds of the Long Eaton Formation in the Long Eaton No. 1 Borehole (SK43SE/161) [SK 4640 3166].
Thickness: At least 97m
Geographical Limits: Lies at depth within the Hathern Shelf and possibly the Widmerpool Half-Graben, in the Long Eaton No.1 Borehole (SK43SE/161) [SK 4640 3166].
Parent Unit: Not Applicable (-)
Previous Name(s): Hathern Anhydrite Series (-1582)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Hathern No.1 hydrocarbon borehole (SK52SW/3), between 538 m and the base of the borehole at 635 m depth. Base of formation not proved. 
Reference(s):
Llewellyn, P G and Stabbins, R. 1970. The Hathern Anhydrite Series, Lower Carboniferous, Leicestershire, England. Transactions of the Institution of Mining and Metallurgy, Vol.79, B1-B15. 
Carney, J N, Ambrose, K and Brandon, A. 2001. Geology of the country between Burton, Loughborough and Derby. Description of 1:50k Sheet 141 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141