| Computer Code: |
LES |
Preferred Map Code: |
LES |
| Status Code: |
Full |
| Age range: |
Chokierian Substage (CH)
— Chokierian Substage (CH) |
| Lithological Description: |
Thin to thick sharp-based turbiditic beds of fine- to coarse-grained protoquartzitic sandstone and silty mudstone. |
| Definition of Lower Boundary: |
The lower boundary is taken at the base of the first sandstone in the sandstone-dominated unit above black fissile mudstone that includes the highest Isohomoceras subglobosum Marine Band. |
| Definition of Upper Boundary: |
The upper boundary is taken below the black fissile mudstone of the Alportian Hudsonoceras proteum (H2a) Marine Band, at the base of a mudstone-dominated succession overlying the Lum Edge Sandstone. |
| Thickness: |
Up to 47.52m |
| Geographical Limits: |
Oakenclough Brook [SK053 636] southeast to Archford [SK 080 605], Thorncliff [SK 020 585] area. |
| Parent Unit: |
Morridge Formation (MORRI)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Lum Edge, Derbyshire; Natural cliff section exposing partial section of the unit (no further details available). Aitkenhead et al., 1985. |
| Reference Section |
Stream section at Blake Brook (Shawfield, Staffordshire) exposes 47.52m full section of the unit, section logged and lodged as borehole record SK06SE/16. |
| Reference(s): |
| Aitkenhead, N, Chisholm, J I, and Stevenson, I P. 1985. Geology of the country around Buxton, Leek and Bakewell. Memoir of the British Geological Survey, England and Wales Sheet 111. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E111
|
