The BGS Lexicon of Named Rock Units — Result Details

Chief Limestone Group [Obsolete: use AG, GSCL]

Computer Code: CHFL Preferred Map Code: CLG
Status Code: Full
Age range: Arundian Substage (CJ) — Pendleian Substage (CE)
Lithological Description: [Obsolete: use GSCL, AG] Cyclical repetition of limestones with subordinate mudstones, siltstones, sandstones and rare coals.
Definition of Lower Boundary: Base of limestone sequence overlying Basal Beds, Cockermouth Lavas or Lower Palaeozoic rocks.
Definition of Upper Boundary: Top of First Limestone - conformably overlain by Hensingham Group.
Thickness: Approximately 450m
Geographical Limits: Country between Cockermouth and Egremont, Cumbria.
Parent Unit: none recorded or not applicable
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  West Cumbria - between Cockermouth and Egremont. 
Reference(s):
Young, B and Boland, M P. 1992. Geology and land-use planning: Great Broughton-Lamplugh area, Cumbria. BGS Technical Report WA/92/54. 
Eastwood, T, Hollingworth, S E, Rose, W C C, and Trotter, F M. 1968. Geology of the country around Cockermouth and Caldbeck. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E022 E023 E047 E037 E029 E028