| Computer Code: |
MT |
Preferred Map Code: |
MT |
| Status Code: |
Index Level |
| Age range: |
Kinderscoutian Substage (CK)
— Kinderscoutian Substage (CK) |
| Lithological Description: |
Thinly to medium-bedded, upward-fining turbiditic cycles of grey-brown, very fine-to fine-grained, massive and laminated, micaceous sandstone overlain by grey, laminated siltstone and dark grey mudstone; bases of sandstones show a variety of sole marks and some trace fossils |
| Definition of Lower Boundary: |
A sharp upward change in a conformable succession from predominatly grey mudstone to sandstone. The base of the first sandstone bed above the Reticuloceras reticulatum Marine Band. |
| Definition of Upper Boundary: |
A sharp upward change in a conformable succession from sandstone to predominantly mudstone. The top of the last fine-grained sandstone bed immediately below the first massive, coarse-grained sandstone of the overlying Shale Grit. |
| Thickness: |
Up to 135 m thick. |
| Geographical Limits: |
Mam Tor, Hope Valley, upper Derwent Valley and Woolands Valley. |
| Parent Unit: |
Hebden Formation (HEBD)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
Mam Tor Sandstones
|
| Stratotypes: |
| Type Section |
Backscar of Mam Tor Landslip, west of Castleton, Derbyshire. Stevenson and Gaunt, 1971; Allen, 1960 |
| Reference(s): |
| Allen, J R L. 1960. The Mam Tor Sandstones: a "turbiditic" facies of the Namurian deltas of Derbyshire, England. Journal of Sedimentary Petrography, Vol. 30, 193-208. |
| Stevenson, I P and Gaunt, G D, 1971. Geology of the country around Chapel-en-le-Frith. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 99. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E099
|
