The BGS Lexicon of Named Rock Units — Result Details

Lightspout Formation

Computer Code: LTGP Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Ediacaran Period (AD) — Ediacaran Period (AD)
Lithological Description: Mainly flaggy, greenish grey siltstones and sandstones with massive sandstone beds. The top c.122m is mainly purple in colour.
Definition of Lower Boundary: Drawn at the base of the Lightspout Formation where the grey mudstones and siltstones rest conformably upon dominantly purple mudstones and siltstones in the Synalds Formation.
Definition of Upper Boundary: Drawn at the conformable upward passage of the Lightspout Formation to the overlying purple shaly mudstone and siltstone with bands of coarse purplish grey sandstone of the Huckster Conglomerate.
Thickness: c.670m
Geographical Limits: Lightspout Hollow, Cardingmill Valley, northwest of Church Stretton, Shropshire.
Parent Unit: Stretton Group (YST)
Previous Name(s): Lightspout Formation [Obsolete Code: Use LTGP] (YSL)
Lightspout Group (-380)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Lightspout Hollow, Cardingmill Valley, northwest of Church Stretton, Shropshire. 
Reference(s):
Lapworth C and Watts W W. 1910. Shropshire. 739-769 in Geology in the field; the Jubilee Volume of the Geologists' Association (1858-1908). Monckton H W and Herries R S (editors). (London: Edward Stanford). 
Greig D C, Wright, J E, Hains, B A and Mitchell, G H. 1968. Geology of the country around Church Stretton, Craven Arms, Wenlock Edge and Brown Clee. Memoir of the Geological Survey, Sheet 166 (England and Wales). (London: H.M.S.O.). 379pp. 
Wright, J E, 1968. The geology of the Church Stretton area (Explanation of 1:25 000 Geological Sheet SO49). Institute of Geological Sciences. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable