The BGS Lexicon of Named Rock Units — Result Details
Meall Dubh Limestone Formation
Computer Code: | MEDL | Preferred Map Code: | MeDL |
---|---|---|---|
Status Code: | Full | ||
Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
Lithological Description: | Yellow-weathering, grey dolomitic metalimestone, striped calcareous schist, tremolite-actinolite schist with biotite or phlogopite porphyroblasts and rosettes of tremolite. | ||
Definition of Lower Boundary: | Boundary with Meall Dubh Striped Pelite Formation probably transitional over a few metres. | ||
Definition of Upper Boundary: | Gradational boundary with the Meall Dubh Graphitic Schist Formation with admixture of graphitic and calc-schists is poorly exposed. | ||
Thickness: | 3 - 15m in Sheet 55W; much tectonic thinning compared with Ballachulish Limestone. | ||
Geographical Limits: | Main development in Strath Fionan [NN 7257 7556]. Also occurs sporadically as far west as Allt na Moine Buidhe [NN 708 612] and as far east as Allt Kynachan [NN 7790 5725]. Not present east of the Loch Tay Fault in Sheets 55E and 64E, where it is tectonically excised, but possibly equivalent to Baddoch Burn Dolomite in Sheet 65W; however some of the rocks of the 'Banvie Burn Series' may be equivalent. | ||
Parent Unit: | Ballachulish Subgroup (DABH) | ||
Previous Name(s): | Meall Dubh Limestone [Obsolete Name and Code: Use MEDL]
(-1059)
Baddoch Burn Dolomite [Obsolete Name and Code: Use MEDL] (*310) Ballachulish Limestone [Obsolete Name and Code: Use DABL, MEDL] (*311) |
||
Alternative Name(s): | Baddoch Burn Dolomite [Obsolete: use MEDL] Ballachulish Limestone [Obsolete: use DABL, MEDL] |
||
Stratotypes: | |||
Type Area | Crags on north side of road through Strath Fionan, c.1km west-north-west of Braes of Foss. | ||
Reference(s): | |||
Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. | |||
Treagus, J E and King, G, 1978. A complete Lower Dalradian succession in the Schiehallion district, central Perthshire. Scottish Journal of Geology, Vol.14, 157-166. | |||
Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). | |||
Stephenson, D and Gould, D. 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S055 |