The BGS Lexicon of Named Rock Units — Result Details

Dure Clough Sandstone

Computer Code: DUCS Preferred Map Code: DuCS
Status Code: Full
Age range: Arnsbergian Substage (CG) — Arnsbergian Substage (CG)
Lithological Description: Sandstones with mostly thin interbedded siltstones - a delta slope facies. Sandstone, grey, weathering orange-brown, fine- to medium-grained, micaceous, thin- to thick-bedded in packets up to c.25m thick. Siltstone, grey micaceous bed c.15m thick in the middle of the unit.
Definition of Lower Boundary: Transitional from grey, micaceous, sandy siltstones with few thin sandstones (commonly less than 0.1m) of the Roeburndale Member (undifferentiated to the sandstone-dominated Dure Clough Sandstones.
Definition of Upper Boundary: Sharp transition the sandstone-dominated Dure Clough Sandstones to grey micaceous siltstones with few thin sandstones (commonly less than 0.1m) of the Roeburndale Member (undifferentiated).
Thickness: c. 70-100m in the Lancaster area; about 250m in the Garstang district (former Park Wood Sandstone Member).
Geographical Limits: Mapped only in the Brennand Fell area of Lancashire [SD 65] but probably more widespread. Equivalents cannot be identified elsewhere because of the absence of biostratigraphical markers.
Parent Unit: Roeburndale Member (RBL)
Previous Name(s): Park Wood Sandstones [Obsolete Name And Code: Use DUCS] (PAW)
Park Wood Sandstone (-876)
Dure Clough Sandstones Member (*571)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Deep Beck Quarry. 
Reference Section  Green Pot Clough (Brennand River headwaters). 
Reference Section  Sapling Clough (Brennand River headwaters) 
Type Section  Dure Clough, (Brennand River headwaters) incised stream gulley. About two thirds of the Member is exposed; intermittent gaps. 
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