The BGS Lexicon of Named Rock Units — Result Details

Lum Edge Sandstones

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