| 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 [Obsolete Name and Code: Use PDH, GEIL]
(-3425)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The Pentland Hills between Lothianburn, Bonaly and Carlops |
| Reference(s): |
| 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. |
| Cameron, I B and Stephenson, D, 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey). |
| Browne, M A E, Smith, R A, and Aitken, A M. 2002. Stratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. British Geological Survey Research Report RR/01/04. 67 pp. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S032
S032
S024
|
