The BGS Lexicon of Named Rock Units — Result Details

Lockington Limestone Formation

Computer Code: LOCL Preferred Map Code: Loc
Status Code: Pending Upgrade
Age range: Asbian Substage (CR) — Brigantian Substage (CX)
Lithological Description: Packages between 15 and 30m thick of pale brown, argillaceous to sandy limestone, displaying turbiditic facies, normal graded with sharp bases, interbedded with thinner sequences of pyritic and carbonaceous mudstone and thin sandstone beds.
Definition of Lower Boundary: The base of the lowest thick, pale brown turbiditic limestone package, where it rests on grey-brown calcareous mudstones and limestones of the Long Eaton Formation.
Definition of Upper Boundary: Where the top of the uppermost thick limestone of the pale brown Lockington Limestone Formation, is overlain by the base of the overlying Widmerpool Formation, consisting of grey-brown mudstone with thin beds of argillaceous limestone.
Thickness: From 143 to 185m
Geographical Limits: Does not appear at outcrop, limited to the Widmerpool half-graben in the subsurface [SK 53].
Parent Unit: Craven Group (CRAV)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Described from the uncored Long Eaton No.1 Borehole (SK43SE/161), between 695m and 880m depth. 
Reference Section  Described from the uncored Ratcliffe on Soar Borehole (SK52NW/72), between 1157m and 1300m depth. 
Reference(s):
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). 
Carney, J N and Cooper, A H, 1997. Geology of the West Leake area: 1:10 000 Sheet SK52NW. British Geological Survey Technical Report WA/97/46. 
Brandon, A, 1996. Geology of the Lower Derwent Valley: 1:10 000 Sheets SK33SE, SK43SW and SK43SE. British Geological Survey Technical Report WA/96/07. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E141