| 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, 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). |
| 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). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E070
E078
E077
|
