Computer Code: |
WGS |
Preferred Map Code: |
WGS |
Status Code: |
Index Level |
Age range: |
Marsdenian Substage (CZ)
— Marsdenian Substage (CZ) |
Lithological Description: |
A, grey, fine-to coarse-grained, medium to thickly bedded, cross-bedded sandstone. |
Definition of Lower Boundary: |
A sharp upward change in a conformable succession from predominantly grey mudstone to sandstone. The base of the first sandstone above the Upper Brimham Grit. |
Definition of Upper Boundary: |
A sharp upward change in a conformable succession from sandstone to predominantly mudstone. The top of the last sandstone below the Cancelloceras cancellatum (G1a1) Marine Band |
Thickness: |
From 8 m to 30 m thick. |
Geographical Limits: |
The Pennine foothills between Masham and Pateley Bridge, North Yorkshire. |
Parent Unit: |
Marsden Formation (MARSD)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
A well exposed in section in Black Dyke 50 m west of confluence with Wandley Gill; base seen but not top. Wilson and Thompson, 1965. |
Reference Section |
Winksley Borehole, SE27SE/9. Dunham and Wilson, 1985. |
Reference(s): |
Dunham, K C, and Wilson, A A. 1985. Geology of the Northern Pennine Orefield. Volume 2 Stainmore to Craven. Economic Memoir of the British Geological Survey, Sheets 40, 41 and 50, and parts of Sheets 31, 32, 51, 60 and 61(England and Wales). |
Wilson, A A. 1960. The carboniferous rocks of Coverdale and adjacent valleys in the Yorkshire Pennines. Proceedings of the Yorkshire Geological Society. Vol 32, 285-316. |
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
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