Computer Code: |
SLO |
Preferred Map Code: |
SLO |
Status Code: |
Full |
Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
Lithological Description: |
Massive, porphyritic and aphyric hyaloclastites and porphyritic and aphyric massive basalt lavas, distinguished by large (to 2cm) bladed plagioclase phenocrysts. |
Definition of Lower Boundary: |
Succeeds Pinbain Lava Formation (PIN). Distinguished by incoming of hyaloclastite and basalt lava with large bladed plagioclase phenocrysts. |
Definition of Upper Boundary: |
Succeeded by Brandy Craig Lava Formation (BCG). Distinguished by the incoming of reddened horizons - suggestive of subaerial weathering. |
Thickness: |
c.285m |
Geographical Limits: |
Area between Girvan and Ballantrae, southwest Scotland. |
Parent Unit: |
Balcreuchan Group (BCN)
|
Previous Name(s): |
Slockenray Formation [Obsolete Name and Code: Use SLO]
(-2428)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Coast at Stockenray, 2km northnortheast of Lendalfoot. |
Reference(s): |
Bluck, B J, 1982. Hyalotuff deltaic deposit in the Ballantrae Ophiolite of SW Scotland: evidence for the crustal position of the lava sequence. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.72 (for 1981), 217-228. |
Ingham, J K. 2000. In Fortey, R A, Harper, D A T, Ingham, J K, Owen, A W, Parkes, M A, Rushton, A W A and Woodcock, N H. 2000. A revised correlation of Ordovician rocks in the British Isles. Geological Society Special Report, No.24. |
Stone, P and Smellie, J L, 1988. Classical areas of British Geology: The Ballantrae area: a description of the solid geology of parts of 1:25 000 sheets NX 08, 18 and 19. [London: HMSO for British Geological Survey.] |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S007
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