The BGS Lexicon of Named Rock Units — Result Details

Drumchastle Pale Limestone Formation

Computer Code: DRPL Preferred Map Code: DrPL
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Pale buff granular limestone at base, overlain by tremolite-biotite pelite, pale dolomitic limestone and green tremolite-biotite limestone.
Definition of Lower Boundary: Sharp boundary with semipelite and quartzose psammite of Cnoc an Fhithich Formation at type locality; elsewhere taken at base of transitional calc-muscovite-biotite pelite.
Definition of Upper Boundary: Transitional boundary via 5m bed of biotite calc-pelite between green tremolite-biotite limestone and carious-weathering calcareous diamictite.
Thickness: 0 - 30m in Sheet 55W; probably considerably tectonically attenuated.
Geographical Limits: From east side of Errochty Synform [NN 7200 6604] discontinuously to core of the Allt Mor synform [NN7688 5453]. East of Loch Tay Fault and north of Killiecrankie Slide, it occurs west of Creag Chlacharnach [NN 980 675] and in Glen Tilt [NN 888 680 - 896 713 and NN 912 713 - 944 743 - 920 705].
Parent Unit: Blair Atholl Subgroup (DABA)
Previous Name(s): White Limestone Within Blair Atholl Subgroup (-2156)
Pale Limestone Within Blair Atholl Subgroup (-218)
White Limestone Within Pale Group Of Blair Atholl Series (-3373)
Alternative Name(s): none recorded or not applicable
Type Section  Near Drumchastle Farm, 2km east of Kinloch Rannoch. 
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). 
Smith, R A and Harris, A L, 1976. The Ballachulish rocks of the Blair Atholl district. Scottish Journal of Geology, Vol.12, 153-157. 
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. 
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. 
Bailey, E B, 1925. Perthshire tectonics: Loch Tummel, Blair Atholl and Glen Shee. Transactions of the Royal Society of Edinburgh, Vol.53, 671-698. 
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). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S055 S055 S064