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): Dure Clough Sandstones Member (*571)
Park Wood Sandstone (-876)
Park Wood Sandstones [Obsolete Name And Code: Use DUCS] (PAW)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Dure Clough, (Brennand River headwaters) incised stream gulley. About two thirds of the Member is exposed; intermittent gaps. 
Reference Section  Deep Beck Quarry. 
Reference Section  Green Pot Clough (Brennand River headwaters). 
Reference Section  Sapling Clough (Brennand River headwaters) 
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