The BGS Lexicon of Named Rock Units — Result Details

Long Bridge Sandstone

Computer Code: LBSA Preferred Map Code: LBr
Status Code: Index Level
Age range: Arnsbergian Substage (CG) — Arnsbergian Substage (CG)
Lithological Description: A medium-bedded, brownish grey, fine- to medium-grained, turbiditic sandstone.
Definition of Lower Boundary: Sharp upward change in a conformable succession from predominantly grey siltstone to sandstone - base of first sandstone bed above the Caw Mill Sandstone.
Definition of Upper Boundary: Sharp upward change in a conformable succession from sandstone to predominantly siltstone - top of last sandstone bed below the Hall Gill Sandstone.
Thickness: 0 to 5m
Geographical Limits: Abbeystead Forest [SD 5500 5400] southeast of Lancaster.
Parent Unit: Roeburndale Member (RBL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Section in Cam Brook, a tributary of the River Wyre, 1.5km southwest of Abbeystead, Lancaster; base seen. Aitkenhead and others, 1992. 
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) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E067 E059