The BGS Lexicon of Named Rock Units — Result Details

Copster Green Sandstone

Computer Code: CPGS Preferred Map Code: notEntered
Status Code: Full
Age range: Pendleian Substage (CE) — Pendleian Substage (CE)
Lithological Description: A coarse-grained, and pebbly, feldspathic sandstone, thickly-bedded, wavy-bedded, planar cross-bedded or massive, reddened, with subordinate beds of siltstone. Pebbles of quartz and mudstone are noted.
Definition of Lower Boundary: The base of a prominent, feature-forming sandstone unit approximately 180 m above the base of the sandstones of the Pendle Grit Member.
Definition of Upper Boundary: The base of a sandstone-dominated unit of the Pendle Grit Member above the highest prominent pebbly sandstone unit within a pebbly-sandstone dominated sequence of the Copster Green Sandstone.
Thickness: 135 m thick at Dinckley [SD 6884 3564], and 100 m thick at Clayton-le-Dale [SD 6726 3322].
Geographical Limits: The Copster Green area [SD63], and the extreme south-eastern part of Garstang 50k sheet.
Parent Unit: Pendle Grit Member (PG)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Quarry at Copster Hall [SD63SE/6] Bridge, 1988. 
Type Section  Two adjacent quarries in Clayton-le-Dale expose strata apparently near the base of the unit, section [SD63SE/9] of Bridge (1988). Bridge 1988. 
Reference(s):
Aitkenhead, N, Bridge, D M, Riley, N J and Kimbell, S F. 1992. Geology of the country around Garstang. Memoir of the British Geological Survey, Sheet 67 (England and Wales) 
Bridge, D McC. 1988. Geology of the area around Hurst Green and Wilpshire. British Geological Survey Technical Report No. WA/87/43. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E067