| Computer Code: |
BNG |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Mid Devonian Epoch (DM)
— Mid Devonian Epoch (DM) |
| Lithological Description: |
Grey to buff red-stained arkosic sandstone, pebbly grit and conglomerate, siltstone and mudstone. |
| Definition of Lower Boundary: |
Drawn at the base of the Bu Ness Sandstone Formation where sandstone alternating with siltstone conformably rests upon thin co-sets of sandstone and thick co-sets of fine-grained sediments of the Observatory Sandstone Formation. |
| Definition of Upper Boundary: |
Drawn at the conformable upward passage of Upper Pebbly Grit of the Bu Ness Sandstone Formation, which is not overlain. |
| Thickness: |
c.200m |
| Geographical Limits: |
Fair Isle, Shetland Islands. |
| Parent Unit: |
Fair Isle Group (FIL)
|
| Previous Name(s): |
Bu Ness Group [Obsolete Name and Code: Use BNG]
(-1368)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Fair Isle. A small island 4.8km long and 3.2km wide, situated halfway between the island groups of Shetland and Orkney. 124km northeast of Duncansby Head on the Scottish Mainland. |
| Reference(s): |
| House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. |
| Mykura, W, 1970. The Old Red Sandstone sediments of Fair Isle, Shetland Islands, Bulletin of the Geological Survey of Great Britain, No.41. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S126
S123
S124
|
