| Computer Code: |
STRL |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Turonian Age (KT)
— Turonian Age (KT) |
| Lithological Description: |
Dark grey micritic limestone and two clastic members. A basal Laig Gorge Sandstone member and the Clach Alasdair Conglomerate Member. |
| Definition of Lower Boundary: |
Unconformable upon the Gribun Chalk Formation and Feorlin Sandstone Formation. |
| Definition of Upper Boundary: |
Unconformable below the Beinn Iadain Mudstone Formation or at an erosion surface beneath the Palaeogene basalts. |
| Thickness: |
2 to 6m on Eigg, 2.5m on Skye and 2m of the Clach Alasdair Conglomerate Member on Mull. |
| Geographical Limits: |
Throughout the Inner Hebrides islands but poorly represented in Morvern. |
| Parent Unit: |
Inner Hebrides Group (IHEB)
|
| Previous Name(s): |
Silicified Chalk
(-941)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The area around Strathaird, Isle of Skye. This is a generalized Type Area. See Braley (1990) for details of specific exposures. |
| Reference(s): |
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
| Lowden, B, Braley, S, Hurst, A and Lewis, J, 1992. Sedimentological studies of the Cretaceous Lochaline Sandstone, NW Scotland. 159-162 in Parnell, J (editor), Basins on the Atlantic Seaboard: Petroleum Geology, Sedimentology and Basin Evolution. Geological Society of London Special Publication, No.62. |
| Braley, S M. 1990. The Sedimentology, Palaeoecology and Stratigraphy of Cretaceous Rocks in N.W. Scotland. Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S060
|
