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 Group (-1269)
Woodhouselee Volcanic Formation (-1270)
Woodhouselee And Braid Hills Group [Obsolete Name And Code: Use WDH] (WBG)
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):
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. 
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). 
Cameron, I B and Stephenson, D, 1985. British Regional Geology: The Midland Valley of Scotland (3rd Edition). (London: HMSO for British Geological Survey). 
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. 
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.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S032 S032