The BGS Lexicon of Named Rock Units — Result Details
Drummuck Subgroup
Computer Code: | DKG | Preferred Map Code: | DKG |
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Status Code: | Full | ||
Age range: | Ashgill Series (OA) — Ashgill Series (OA) | ||
Lithological Description: | Consists mainly of mudstones, some olive-green in colour, with sandy beds and basal conglomerate or grit. | ||
Definition of Lower Boundary: | Drawn at base of basal conglomerate of the Auldthorns Formation where this rests conformably on alternating shales and sandstone of the Shalloch Formation. | ||
Definition of Upper Boundary: | Drawn at unconformity at base of Silurian Mulloch Hill Conglomerate. | ||
Thickness: | c.380m | ||
Geographical Limits: | Confined to Craighead Inlier, Ayrshire, Scotland. | ||
Parent Unit: | Ardmillan Group (AMN) | ||
Previous Name(s): | Trilobite Shale [Obsolete Name and Code: Use DKG]
(-2755)
Drummock Group (-863) Drummock Beds [Obsolete Name and Code: Use DKG] (-4609) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Drummuck Farm, northeast of Girvan, Ayrshire, Scotland. | ||
Reference(s): | |||
Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. | |||
Greig, D C. 1971. British Regional Geology: the South of Scotland (3rd Edition). (Edinburgh: HMSO for the Institute of Geological Sciences.) | |||
Murchison, R I. 1851. On the Silurian rocks of the south of Scotland. Quarterly Journal of the Geological Society of London, Vol.7, p.137. | |||
Lamont, A. 1935. The Drummuck Group, Girvan; A stratigraphical revision, with descriptions of new fossils from the lower part of the group. Transactions of the Geological Society of Glasgow, Vol.19, 288-334. | |||
Walton, E K. 1983. Lower Palaeozoic - Stratigraphy. In Craig, G Y (editor), Geology of Scotland (2nd edition)(Edinburgh: Scottish Academic Press.) | |||
Lapworth, C, 1882. The Girvan Succession. Quarterly Journal of the Geological Society of London, Vol. 38, 537-666. | |||
Harper, D A T, 1982. The stratigraphy of the Drummock Group (Ashgill), Girvan. Geological Journal, Vol.17, p.251-277.l. 17 251-277 | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S014 |