| Computer Code: |
PIN |
Preferred Map Code: |
PIN |
| Status Code: |
Full |
| Age range: |
Arenig Series (OR)
— Arenig Series (OR) |
| Lithological Description: |
Thick, massive and pillowed, porphyritic and aphric basalt lavas, partly brecciated. Rare beds of lithic arenite, siltstone, mudstone and polymict basalt lava breccia. |
| Definition of Lower Boundary: |
Succeeds and locally interdigitates with Kilranny Hill Formation (KRY). Distinguished by incoming lava facies. |
| Definition of Upper Boundary: |
Succeeded by Slockenray Hyaloclastite and Lava Formation (SLO). Distinguised by incoming of hyalocastite and basalt lava with large bladed plagioclase phenocrysts. |
| Thickness: |
c.475m |
| Geographical Limits: |
Area between Girvan and Ballantrae, southwest Scotland. |
| Parent Unit: |
Balcreuchan Group (BCN)
|
| Previous Name(s): |
Pinbain Formation [Obsolete Name and Code: Use PIN]
(-451)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Pinbain Hill, 2.5km northeast 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. |
| 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.] |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S007
|
