| Computer Code: |
DCPS |
Preferred Map Code: |
PitS |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Semipelite dominant with interbedded pelite, micaceous psammite and volcaniclastic rocks (Green Beds), and containing minor pebbly psammite. Metamorphosed to garnet-mica schist in type area. |
| Definition of Lower Boundary: |
Change from silty limestone at top of Loch Tay Limestone to dominantly semipelitic and pelitic rocks. |
| Definition of Upper Boundary: |
Change from dominantly semipelitic rocks to dominantly psammitic rocks (not seen in Sheet 55W). In parts of the outcrop outwith Sheet 55W, the change coincides with the main volcaniclastic unit. |
| Thickness: |
300 - 500m (estimated 300+m in Sheet 55W); not mapped separately in Sheet 55E, but transition to Ben Ledi Grit or equivalent probably occurs 300 - 500m above base of Southern Highland Group, close to main 'Green Beds' unit. |
| Geographical Limits: |
From Glen Brerachan [NO 01 63], 9km north-east of Pitlochry, south-westwards through Pitlochry [NN 94 58] to Kenmore [NN 77 45] and at least as far as Loch Tay Fault in Sheets 46 and 47. Also small outlier west of Glen Doll Fault [NO 23 78]. |
| Parent Unit: |
Southern Highland Group (SOHI)
|
| Previous Name(s): |
Pitlochry Schist [Obsolete Name and Code: Use DCPS]
(-2146)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
(Upper part of Formation). Camaserney Burn from confluence with Ruith Mhuilinn downstream to include 'Green Beds' at Camaserney. |
| Partial Type Section |
(Lower part of Formation). Keltney Burn from boundary with Loch Tay Limestone to confluence with Allt Coire Pheiginn, downstream as far as hotel at Coshieville. |
| Reference(s): |
| Treagus, J E. 2001. Solid geology of the Schiehallion district. Memoir of the British Geological Survey, Sheet 55W (Scotland). |
| 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. |
| 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). |
| 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
S065
S047
S046
S055
S046
S046
|
