The BGS Lexicon of Named Rock Units — Result Details
Schiehallion Boulder Bed Formation
Computer Code: | DBST | Preferred Map Code: | SchB |
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Status Code: | Full | ||
Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
Lithological Description: | Lower part: Calcareous diamictite with dominantly calcareous clasts. Central part: Schistose and feldspathic psammite and quartzite (discontinuous). Upper part: Quartz-rich diamictite with dominantly granite and quartzite clasts. | ||
Definition of Lower Boundary: | Gradation from biotite calc-pelite to calcareous diamictite over 10m. | ||
Definition of Upper Boundary: | Sharp contact between quartzose diamictite and thinly-bedded quartzite. However, 10 - 20m bed of reworked granite diamictite occurs near base of Schiehallion Quartzite Formation on Cnoc nan Aighean. | ||
Thickness: | 0 - 250m in Sheet 55W | ||
Geographical Limits: | From east end of Loch Errochty [NN 7190 6609] to Loch Kinardochy [NN 775 550] west of Loch Tay Fault; around Loch Tummel [NN 833 596] and at Kirkton of Lude [NN 900 690], east of Loch Tay Fault. | ||
Parent Unit: | Islay Subgroup (DBIS) | ||
Previous Name(s): | Tillite (Banffshire) [Obsolete Name And Code: See DBIS, DBST, DBPT]
(DBBT)
Schichallion Boulder Bed [Obsolete Name and Code: Use DBST] (-1484) Schiehallion Boulder Bed [Obsolete Name and Code: Use DBST] (-201) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Northern slopes of Schiehallion, on western side of Meall nan Aighean. | ||
Reference(s): | |||
Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). | |||
Bailey, E B. 1925. Perthshire tectonics: Loch Tummel, Blair Atholl and Glen Shee. Transactions of the Royal Society of Edinburgh, Vol. 53, 671-698. | |||
Bailey, E B, and McCallien, W J. 1937. Perthshire tectonics: Schiehallion to Glen Lyon. Transactions of the Royal Society of Edinburgh, Vol. 59, 79-117. | |||
Barrow, G, Grant Wilson, J S, and Cunningham Craig, E H. 1905. The geology of the country around Blair Atholl, Pitlochry and Aberfeldy. Memoir of the British Geological Survey, Scotland (Sheet 55). | |||
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. | |||
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 S055 S056 |