| Computer Code: |
LVS |
Preferred Map Code: |
LvS |
| Status Code: |
Index Level |
| Age range: |
Yeadonian Substage (CY)
— Yeadonian Substage (CY) |
| Lithological Description: |
A medium to thickly bedded, grey, medium-to coarse-grained, cross-bedded sandstone with beds of grey siltstone and a lingula band in parts. |
| Definition of Lower Boundary: |
A sharp upward change in a comformable succession from predominatly grey mudstone to sandstone, at the base of the first sandstone above the Cancelloceras cumbriense (G1b1) Marine Band. |
| Definition of Upper Boundary: |
A sharp upward change in a conformable succession from sandstone to predomantly mudstone to top of the last sandstone below the subcrenatum Marine Band (where recognised) or below the Winkesley Sandstone. |
| Thickness: |
From 10 - 25 m thick. |
| Geographical Limits: |
The pennine foothills between Masham, Kirkby Malzeard Moor and Winksley, North Yorkshire. |
| Parent Unit: |
Millstone Grit Group [See Also MIGR] (MG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Sporadic exposures in the River Laver to the west of Winksley, North Yorkshire. Wilson and Thompson, 1965 |
| Reference Section |
Well exposed in section in Stock Beck, a tributary of the River Laver, 5km west of Kirkby Malzeard, North Yorkshire: base not seen. Wilson and Thompson, 1965. |
| Reference(s): |
| Wilson, A A and Thompson, A T. 1965. The Carboniferous section in the Kirkby Malzeard area, Yorkshire. Proceedings of the Yorkshire Geological Society. Vol 35, 203-227. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E051
|
