The BGS Lexicon of Named Rock Units — Result Details
Gala Unit 8
| Computer Code: | GAL8 | Preferred Map Code: | GALA8 |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Aeronian Age (SA) — Telychian Age (ST) | ||
| Lithological Description: | Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportion, interpreted as turbidites. | ||
| Definition of Lower Boundary: | Southern faulted boundary: Mochrum Fault (Rhins of Galloway and Wigtown Peninsula). Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age up to sedwickii to possible turriculatus Biozones). | ||
| Definition of Upper Boundary: | Northern faulted boundary: southernmost splay of Port Logan Fault (Rhins of Galloway); Cambret Fault (Kirkcowan and Wigtown). | ||
| Thickness: | c. 800m of near vertical strata (Rhins) | ||
| Geographical Limits: | Mapped from Port Logan Bay on the Rhins of Galloway (Sheet 1/3) to Wigtown (Sheet 4E). Possible correlation with Central Belt turbidites of Llandovery age in the Ards Peninsula, Northern Ireland. | ||
| Parent Unit: | Gala Group (GALA) | ||
| Previous Name(s): | Gala Group
(GALA)
Intermediate and Garnetiferous Greywacke Groups [Obsolete Name and Code: Use GAL8, GAL7] (-273) Queensberry Grits [Obsolete Name and Code: Use GDE, GALA, GAL1, GAL2, GAL3, GAL4, GAL5, GAL6, GAL7, GAL8] (-1552) Gala Group (GALA) |
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| Alternative Name(s): | Port Logan Formation |
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| Stratotypes: | |||
| Reference Section | Coastal section north of Clanyard Bay, 2 km south of Port Logan, Rhins of Galloway (Sheet 1/3). Stone, 1995. | ||
| Reference(s): | |||
| Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. | |||
| Stone, P, 1995. Geology of the Rhins of Galloway district. Memoir of the British Geological Survey, Sheets 1 & 3 (Scotland). | |||
| Barnes, R P, Anderson, T B, and McCurry, J A. 1987. Along-strike variation in the stratigraphical and structural profile of the Southern Uplands Central Belt in Galloway and Longford Down. Journal of the Geological Society, 144, 807-816. | |||
| Lapworth, C, 1871. On the Lower Silurian rocks in the neighbourhood of Galashiels. Transactions of the Edinburgh Geological Society, 2, 46 - 58. | |||
| Walton, E K. 1955. Silurian greywackes in Peeblesshire. Proceedings of the Royal Society of Edinburgh, B65, 327-357. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S001 S003 S004 S004 N29 | |||