The BGS Lexicon of Named Rock Units — Result Details

Helm Member

Computer Code: 1HELM Preferred Map Code: Helm
Status Code: Full
Age range: Pridoli Epoch (SO) — Pridoli Epoch (SO)
Lithological Description: Laminated siltstone and mudstone with thinly interbedded, fine-grained sandstone that is pervasively reddened.
Definition of Lower Boundary: Base of the lowest reddened laminated siltstone unit where it overlies thickly bedded, unreddened, coarse- to medium-grained sandstone forming the lower part of the Kirkby Moor Formation.
Definition of Upper Boundary: Base of the lowest thick and unreddened sandstone bed from the upper part of the Kirkby Moor Formation.
Thickness: About 250m
Geographical Limits: Restricted to The Helm and its immediate vicinity.
Parent Unit: Kirkby Moor Formation (KMF)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The Helm, a hill on the southeast side of Kendal. King, 1994. 
Type Section  Disused quarry on the northwest side of The Helm, a hill on the southeast side of Kendal. King, 1994. 
Reference(s):
Shaw, R W L. 1971. The faunal stratigraphy of the Kirkby Moor Flags of the type area near Kendal. Westmorland. Geological Journal, Vol.7, p.359-380. 
Kneller, B C, Scott R W, Soper N J, Johnson E W and Allen P M, 1994. Lithostratigraphy of the Windermere Supergroup, Northern England. Geological Journal, Vol. 29, 219-240. 
King, L M. 1994. Turbidite to storm transition in a migrating foreland basin: The Kendal Group (Upper Silurian), northwest England. Geological Magazine, Vol.131, 255-267. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable