The BGS Lexicon of Named Rock Units — Result Details

Gavells Clough Sandstone

Computer Code: GVCS Preferred Map Code: GvCS
Status Code: Full
Age range: Arnsbergian Substage (CG) — Arnsbergian Substage (CG)
Lithological Description: Sandstone, pale orange-brown, medium-grained, in part coarse-grained, micaceous, thick-bedded; mostly apparently massive, though with some cross bedding.
Definition of Lower Boundary: Lower boundary is sharp and erosional, with sandstone resting either on grey, micaceous, sandy, siltstones overlying Eumorphoceras ferrimontanum Marine Band, or on mudstone of the marine band itself.
Definition of Upper Boundary: Upper boundary is seen only in right tributary to Sapling Clough [SD627 564] on Brennand Fell, where top 0.5m of the Member is micaceous and laminated with large lenticuler ferruginous concretions and grades rapidly upwards into grey micaceous sandy siltstones of the Roeburndale Member.
Thickness: To 5m, but variable.
Geographical Limits: Brennand Fell and Abbeystead areas.
Parent Unit: Roeburndale Member (RBL)
Previous Name(s): Gavells Clough Sandstone Member (-2222)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Brennand Fell. Exposed in numerous stream sections and crag exposures, but never for more than a few metres. 
Reference Section  Swine Crag. in backscarp of landslip, white side of Tarnbrook Fell. 
Reference Section  Right tributary to Sapling Clough, Brennand Fell. 
Reference Section  White Crag, Brennand Fell. 
Reference Section  Gavells Clough; Tarnbrook Wyre headwaters, Brennand Fell. 
Reference(s):
Brandon, A, Aitkenhead, N, Crofts, R G, Ellison, R A, Evans, D J and Riley, JN J, 1998. Geology of the country around Lancaster. Memoir of the British Geological Survey, Sheet 59 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E059