The BGS Lexicon of Named Rock Units — Result Details

Woodhouselee Volcanic Member

Computer Code: WDH Preferred Map Code: WDH
Status Code: Full
Age range: Pridoli Epoch (SO) — Lochkovian Age (DO)
Lithological Description: Pale lilac or pink trachytes and andesites with phenocrysts of biotite and alkali-feldspars. Generally highly kaolinized.
Definition of Lower Boundary: Conformable: where rhyolitic tuff and flow-banded rhyolite of the Caerketton Volcanic Member are overlain by, or locally interbedded with, pale lilac or pink trachytes and andesite.
Definition of Upper Boundary: Conformable: where pale lilac or pink trachytes and andesites are overlain by feldspar-phyric and fine-grained microporphyritic basalts and andesites of the Carnethy Volcanic Member.
Thickness: Variable - 75-150m
Geographical Limits: Pentland Hills.
Parent Unit: Pentland Hills Volcanic Formation (PDH)
Previous Name(s): Woodhouselee And Braid Hills Group [Obsolete Name And Code: Use WDH] (WBG)
Woodhouselee Group (-1269)
Woodhouselee Volcanic Formation (-1270)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Exposure of feldspar-phyric trachyte in old quarry on south side of south Black Hill, 275m north-north-west of fort on Camp Hill. 
Partial Type Section  Exposure of kaolinitised and silicified biotite trachyte in glacial meltwater channel on north-west slope of Woodhouselee Hill. 
Type Section  Boundary Stratotype: Feldspar-phyric trachytes interbedded with rhyolites of Caerketton Volcanic Member on summit of Castlelaw Hill. 
Reference(s):
Cameron, I B and Stephenson, D, 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey). 
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. 
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.) 
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). 
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