The BGS Lexicon of Named Rock Units — Result Details

Hebblethwaite Member

Computer Code: HBW Preferred Map Code: notEntered
Status Code: Full
Age range: Llandovery Epoch (SL) — Llandovery Epoch (SL)
Lithological Description: Red-brown mudstones, typically massive, but with thin horizons of paler brown calcareous nodules.
Definition of Lower Boundary: At the lowest appearance of red coloured mudstones above the green-grey mudstones and siltstones of the lower part of the Browgill Formation.
Definition of Upper Boundary: At the top of the last red mudstone, in the transition to the pale grey mudstone of the overlying Far House Member.
Thickness: 0-20m
Geographical Limits: Unit extends intermittently across the Howgill Fells inliers, and is known in several Lake District sections, (Ingham, J K, et al, 1978).
Parent Unit: Browgill Formation (BRW)
Previous Name(s): Red Beds [Obsolete Name And Code: Age And Synonymy Unrecorded] (RBD)
Alternative Name(s): none recorded or not applicable
Type Section  Hebblethwaite Hall Gill, 200m southwest of Hebblethwaite Hall. 
Rickards, R B, 1970. The Llandovery (Silurian) graptolites of the Howgill Fells (northern England). Monograph Palaeontological Society, London, 1-108. 
Rickards, R B, 1973. On some highest Llandovery red beds and graptolite assemblages in Britain and Eire. Geological Magazine, Vol.110, 70-72. 
Ingham, J K, McNamara, K J and Rickards, R B, 1978. The Upper Ordovician and Silurian rocks. 29-44 in Moseley, F (editor) "The Geology of the Lake District". Yorkshire Geological Society, Leeds. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable