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): | |||
| 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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||