The BGS Lexicon of Named Rock Units — Result Details
Lightspout Formation
Computer Code: | LTGP | Preferred Map Code: | notEntered |
---|---|---|---|
Status Code: | Full | ||
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.670 m. | ||
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 [Obsolete Name and Code: Use LTGP] (-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). | |||
Wright, J E, 1968. The geology of the Church Stretton area (Explanation of 1:25 000 Geological Sheet SO49). Institute of Geological Sciences. | |||
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. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |