The BGS Lexicon of Named Rock Units — Result Details

Slack Bank Rock

Computer Code: SBR Preferred Map Code: SBR
Status Code: Index Level
Age range: Langsettian Substage (CA) — Langsettian Substage (CA)
Lithological Description: A medium-bedded, medium- to fine-grained, ripple cross-laminated, grey sandstone.
Definition of Lower Boundary: Sharp upward change in a conformable succession from predominantly grey mudstone to sandstone - base of first sandstone above the Blocking and/or Middleton Eleven Yards Coal. Erosive base washing out Middleton Eleven Yard Coal in Leeds area.
Definition of Upper Boundary: Sharp upward change in a conformable succession from sandstone to predominantly mudstone - top of last sandstone bed below the Middleton Main/Wheatley Lime Coal.
Thickness: 0-40m
Geographical Limits: Extensive area covered by east Leeds/Garforth [SE3700 3300] to southwest of Wakefield [SE3000 1800], West Yorkshire.
Parent Unit: Pennine Lower Coal Measures Formation (PLCM)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Garforth Bridge Borehole (SE33SE/13), 1km southwest of Micklefield, West Yorkshire; full thickness recorded between 87.8 and 127.4m. Edwards et al. 1950. 
Reference Section  Peckfield Colliery Shaft (SE43SW/4), West Garforth, West Yorkshire; recorded from 70.9 to 103.6m. Edwards et al. 1950. 
Reference(s):
Edwards, W Mitchell, GH and Whitfield, TH. 1950. Geology of the district north and east of Leeds. Memoir of the British Geological Survey, sheet 70 (England and Wales). 
Edwards, W, Wray, D A and Mitchell, G H. 1940. Geology of the country around Wakefield. Memoir of the British Geological Survey, Sheet 78 (England and Wales). 
Lake, R D. 1999. The Wakefield District - a concise account of the geology. Memoir of the British Geological Survey, Sheet 78 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E077 E070 E078