The BGS Lexicon of Named Rock Units — Result Details

Ochil Volcanic Formation

Computer Code: OVF Preferred Map Code: OVF
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Pyroxene andesite and olivine basalt lavas and rhyodacite, trachyandesite, hornblende andesite and volcaniclastic rocks.
Definition of Lower Boundary: The base is not seen, because the unit interdigitates laterally with the siliciclastic rocks of the Dundee Flagstone Formation.
Definition of Upper Boundary: The top of the lavas and associated volcaniclastic rocks of the Ochil Volcanic Formation, overlain by sandstones of the Scone Sandstone Formation.
Thickness: Up to 2400 m thick.
Geographical Limits: The bridge of Allan to Tayport and Coupar Angus, central Scotland.
Parent Unit: Arbuthnott-Garvock Group (ATGK)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Ochil Hills 
Partial Type Section  The eastern slopes of Durryat. 
Partial Type Section  Membie Glen section. 
Reference(s):
Francis, E H, Forsyth, I H, Read, W A and Armstrong, M. 1970. The geology of the Stirling district. Memoir of the Geological Survey of Great Britain, Sheet 39 (Scotland). 
Armstrong, M and Paterson, I B, 1970. The Lower Old Red Sandstone of the Strathmore Region. Report of the Institute of Geological Sciences No.70/12 
Armstrong, M, Paterson, I B and Browne, M A E, 1985. Geology of the Perth and Dundee district. Memoir of the British Geological Survey, Sheets 48W, 48E and 49 (Scotland). 108pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S039 S040 S048 S056 S048 S048 S049 S040 S039 S039 S040