The BGS Lexicon of Named Rock Units — Result Details
Greenan Castle Pyroclastic Member
Computer Code: | GCP | Preferred Map Code: | GCP |
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Status Code: | Full | ||
Age range: | Chadian Substage (CI) — Asbian Substage (CR) | ||
Lithological Description: | Bedded pyroclastic rocks and volcaniclastic sedimentary rocks comprising lithic lapilli tuffs and tuffs. | ||
Definition of Lower Boundary: | Where seen overlying sandstones, mudstones and cementstones of the underlying Ballagan Formation on the shore at Greenan Castle, possibly disconformable on (lithified) Ballagan Formation. | ||
Definition of Upper Boundary: | Unconformably overlain by mudstones and sandstones of the Lawmuir Formation on the shore at Greenan Castle. | ||
Thickness: | Thickness of 23 m at Greenan Castle in the Ayr district, yet dies out laterally. | ||
Geographical Limits: | A local unit on the shore and around Greenan Castle (south of Ayr, Scotland), which dies out approximately 1km inland. | ||
Parent Unit: | Clyde Plateau Volcanic Formation (CPV) | ||
Previous Name(s): | Bedded agglomerate of Greenan Castle [Obsolete Name and Code: Use GCP]
(-2199)
Greenan Castle Ash [Obsolete Name and Code: Use GCP] (-2200) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | On the shore and in the cliff at Greenan Castle, south of Ayr, Scotland. Eyles, et al., 1949; Whyte, 1964, 1992. | ||
Reference(s): | |||
Whyte, F. 1964. The Heads of Ayr Vent. Transactions of the Geological Society of Glasgow, Vol.25, 72-97. | |||
Dean, M T, Browne, M A E, Waters, C N and Powell, J H. 2011. A lithostratigraphical framework for the Carboniferous successions of northern Great Britain (onshore). British Geological Survey Research Report, RR/10/007. 165pp. | |||
Stephenson, M H, Williams, M, Monaghan, A, Arkley, S, and Smith, R A. 2002. Biostratigraphy and palaeoenvironments of the Ballagan Formation (lower Carboniferous) in Ayrshire, SW Scotland. Scottish Journal of Geology, Vol.38, 93-111. | |||
Eyles, V A, Simpson, J B and Macgregor, M C. 1949. Geology of Central Ayrshire. Memoir of the Geological Survey of Scotland, British Geological Survey, Sheet 14 (Scotland). | |||
Sowerbutts, A A. 1999. Geology of the Dunure, Carrick Hills and Heads of Ayr area. BGS Technical Report, WA/99/102. | |||
Whyte, F. 1992. Heads of Ayr. In: Lawson, J D and Weedon, W S (Eds), Geological excursions around Glasgow and Girvan. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S014 |