The BGS Lexicon of Named Rock Units — Result Details
Gala Unit 4
| Computer Code: | GAL4 | Preferred Map Code: | GALA4 |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Rhuddanian Age (SR) — Aeronian Age (SA) | ||
| Lithological Description: | Graded beds that may include wacke sandstone, siltstone and mudstone in variable proportions, interpreted as turbidites. Conglomeratic beds are a feature of this unit. Siltstone interbeds yielded fauna of the cyphus to triangulatus Biozones. | ||
| Definition of Lower Boundary: | Southern faulted boundary: Gillespie Burn Fault. Stratigraphical lower boundary with underlying Moffat Shale Group (of Ordovician to Silurian age). | ||
| Definition of Upper Boundary: | Northern faulted boundary: Sandhead Fault. | ||
| Thickness: | c. 1500m of near vertical strata. | ||
| Geographical Limits: | Mapped from Float Bay on the Rhins of Galloway (Sheet 1/3) to Peebleshire (Sheet 24 E). 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 Greywacke Group [Obsolete Name and Code: Use GAL4, GAL5, GAL6] (-3414) Gala Group (GALA) Queensberry Grits [Obsolete Name and Code: Use GDE, GALA, GAL1, GAL2, GAL3, GAL4, GAL5, GAL6, GAL7, GAL8] (-1552) |
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| Alternative Name(s): | Sinniness Formation Sinniness Or Float Bay Formation Of The Rhins Of Galloway |
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| Stratotypes: | |||
| Reference Section | Coastal section between Stair Haven and the Mull of Sinniness, east shore of Luce Bay (Sheet 4W, [Scotland]). Barnes, in prep. | ||
| Reference Section | Coastal section north and south of Float Bay, 4 km WSW of Sandhead, Rhyns of Galloway (Sheet 1/3 [Scotland]). Stone, 1995. | ||
| Reference Section | Conglomerate facies of Craigenputtock Hill, 8 km NNE of Corsock (Sheet 9 W, [Scotland]). McMillan, 2002; Phillips, 1999. | ||
| Reference(s): | |||
| 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. | |||
| McMillan, A A. 2002. Geology of the New Galloway and Thornhill District. 2002. Memoir of the British Geological Survey. Sheets 9W and 9E (Scotland). | |||
| 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. | |||
| Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. | |||
| Phillips, E R. 1999. The minerology and petrology of lithic clasts from the Craigenputtock and Afton Water conglomerates, Southern Uplands, Scotland. British Geological Survey, Short Report, MPSR/99/55. | |||
| Barnes, R P. 2008. The geology of the Whithorn, Kirkcowan and Wigtown district. Memoir of the British Geological Survey, Sheets 4W, 4E and 2 (Scotland). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S001 S003 S004 S004 S009 S009 S016 S024 S024 N29 S015 | |||