The BGS Lexicon of Named Rock Units — Result Details

Strathaird Limestone Formation

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): Laig Siltstone Member [Obsolete Name And Code: See STRL And LAGS] (LAGSL)
Silicified Chalk (-941)
Alternative Name(s): Laig Gorge Limestone Member
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):
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 Unpublished PhD Thesis CNAA, Polytechnic SouthWest (now University), Plymouth. 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