| 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, 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. |
| 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 |
| 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
|
