The BGS Lexicon of Named Rock Units — Result Details

Coniston Limestone Group [Obsolete Name And Code: Use DNT]

Computer Code: COL Preferred Map Code: CoL
Status Code: Index Level
Age range: Cautleyan Stage (OU) — Hirnantian Age (OH)
Lithological Description: Interbedded, cleaved calcareous mudstones and nodular, argillaceous limestones with subordinate conglomerates, sandstones, siltstones, shales and acid volcanic rocks.
Definition of Lower Boundary: At base of Longsleddale Formation, unconformable upon volcanic strata of Borrowdale Volcanic Group.
Definition of Upper Boundary: At base of Black Shales of the Skelgill Beds.
Thickness: c. 40 metres, maximum thickness of 110 metres at Kentmere.
Geographical Limits: Not defined.
Parent Unit: Not Entered (?)
Previous Name(s): Coniston Limestone Series (-4563)
Coniston Limestone (-2107)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Coniston District, Cumbria, e g. north west of Ashgill Quarry, Sheet 38, Ambleside. 
Reference(s):
Mitchell, G H. 1956. The geological history of the Lake District. Proceedings of the Yorkshire Geological Society. Vol.30, p.432. 
McNamara, K J. 1979. The age, stratigraphy and genesis of the Coniston Limestone Group in the southern Lake District. Geological Journal, 14, 41-69. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E038