The BGS Lexicon of Named Rock Units — Result Details
Birrenswark Volcanic Formation
| Computer Code: | BIRV | Preferred Map Code: | BIRV |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Famennian Age (DA) — Famennian Age (DA) | ||
| Lithological Description: | Olivine-basalt lavas with impersistent sedimentary intercalations. | ||
| Definition of Lower Boundary: | Irregular base on Upper Old Red Sandstone strata. | ||
| Definition of Upper Boundary: | Faulted or irregular contact with Kirkbean Cementstone Member. | ||
| Thickness: | 15-60 m. | ||
| Geographical Limits: | Lavas are best developed between Dinely and Langholm. They thin westwards towards Birrenswark Hill; the westernmost extension is west of Dumfries at Kirkbean Glen, Southerness, Kirkcudbrightshire. | ||
| Parent Unit: | Inverclyde Group (INV) | ||
| Previous Name(s): | Birrenswark Lavas [Obsolete Name And Code: Use BIRV]
(BIL)
Birrenswark Volcanic Group [Obsolete Name and Code: Use BIRV] (-3854) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | White Cove, 2.2 km ENE of Arkleton Farm, Langholm (SW flanks of Arkleton Hill). | ||
| Partial Type Section | Eastern slopes of Warb Law, 1.6 km SSW of Langholm. | ||
| Reference(s): | |||
| Marshall, J, Reeves, E J, Bennett, C, Davies, S, Kearsey, T, Millward, D, Smithson, T, and Browne, M. 2019. Reinterpreting the age of the uppermost 'Old Red Sandstone' and Early Carboniferous in Scotland. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1-14. doi:10.1017/S1755691018000968 | |||
| Lumsden G I, Tulloch W, Howells M F and Davies A. 1967. The geology of the neighbourhood of Langholm. Memoir of the Geological Survey, Sheet 11 (Scotland). | |||
| McRobert, R W, 1920. Igneous rocks of Teviot and Liddesdale. Transactions of the Edinburgh Geological Society, Vol.11, 86-103. | |||
| Pallister, J W, 1952. The Birrenswick Lavas, Dumfriesshire. Transactions of the Edinburgh Geological Society, Vol.14, 336-348. | |||
| Craig, G Y. 1956. The Lower Carboniferous outlier of Kirkbean, Kirkcudbrightshire. Transactions of the Geological Society of Glasgow, Vol. 22, 113 - 132. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| S006 S005 S010 S011 S017 S017 S010 S006 S017 | |||