The BGS Lexicon of Named Rock Units — Result Details

Pentland Hills Volcanic Formation

Computer Code: PDH Preferred Map Code: PDH
Status Code: Full
Age range: Pridoli Epoch (SO) — Lochkovian Age (DO)
Lithological Description: Acid and basic lavas and associated pyroclastic rocks including basalts, andesites, trachytes, rhyolites, acid and basic tuffs and intercalated conglomerates, sandstones and minor constituent sediments.
Definition of Lower Boundary: The base of the volcanic rocks overstepping from the Swanshaw Sandstone Formation to the Greywacke Conglomerate Formation.
Definition of Upper Boundary: The unconformity with the Inverclyde Group (Carboniferous).
Thickness: About 1800 m thick.
Geographical Limits: The Pentland Hills in east-cental Scotland.
Parent Unit: Lanark Group (LNK)
Previous Name(s): Lower Old Red Sandstone Lavas (-3425)
Alternative Name(s): none recorded or not applicable
Type Area  The Pentland Hills between Lothianburn, Bonaly and Carlops 
Mitchell, G H. 1962. The geology of the neighbourhood of Edinburgh. (Explanation of Sheet 32) Third Edition. (Reprinted 1980). Memoir of the Geological Survey of Great Britain (Scotland). 
Geikie, A, 1897. The Ancient Volcanoes of Great Britain. Vol.1, 317-325. (London: Macmillan). 
Howell, H H and Geikie, A, 1861. The Geology of the neighbourhood of Edinburgh (1st edition). Memoir of the Geological Survey, Scotland. 
Mykura, W, 1986. Pentland Hills. 161-173 in Lothian Geology. An Excursion Guide. McAdam, A D and Clarkson, E N K (editors). (Edinburgh: Scottish Academic Press.) 
Peach, B N, Clough, C T, Hinxman, L W, Grant Wilson, J S, Crampton, C B, Maufe, H B and Bailey, E B, 1910. The geology of the Neighbourhood of Edinburgh (2nd edition). Memoir of the Geological Survey of Scotland, Sheet 32 (Scotland). 
Thirlwall, M F, 1988. Geochronology of Late Caledenian magmatism in northern Britain. Journal of the Geological Society, Vol.145, 951-967. 
Mykura, W, 1960. The Lower Old Red Sandstone igneous rocks of the Pentland Hills. Bulletin of the Geological Survey of Great Britain, No.16, 131-155. 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
Cameron, I B and Stephenson, D, 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S032 S032 S024