The BGS Lexicon of Named Rock Units — Result Details

Scalpay Sandstone Formation

Computer Code: SCS Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Pliensbachian Age (JE) — Toarcian Age (JT)
Lithological Description: The Scalpay Sandstone Formation comprises siltstones and sandstone, in a gradually coarsening-upwards succession to massive fine-grained sandstone. Locally cross-bedded and bioturbated. Fossiliferous horizons of Pseudopecten and other bivalves exist. The top of the formation is characterised by thin beds, ferriginous material and of chamosite-rich oolidal ironstone.
Definition of Lower Boundary: Diachronous coarsening upwards from fissile mudstone of the Pabay Shale Formation.
Definition of Upper Boundary: Abrupt lithological change to fissile mudstone of the Portree Shale Formation.
Thickness: 10m exposed
Geographical Limits: Sea of the Hebrides Basin.
Parent Unit: Lias Group (LI)
Previous Name(s): Scalpa Sandstone Formation (-1807)
Scalpa Sandstone (-1169)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Rubha na Leac Peninsula, Isle of Raasay. Complete section. Morton, N and Hudson, J D, 1995. 
Reference Section  South of Dun Liath ruins, near Elgol, Strathaird, Skye. Partial upper section. Morton N and Hudson J D, 1995. 
Reference(s):
Morton, N and Hudson, J D, 1995. Field Guide to the Jurassic of the Isles of Raasay and Skye, Inner Hebrides, north-west Scotland. In: Taylor, P D (editor), Field Geology of the British Jurassic. Geological Society of London, 209-280. 
Morton, N. 1965. The Bearrenaig Sandstone Series (Middle Jurassic) of Skye and Raasay. Scottish Journal of Geology, Vol.1, 189-216. 
Fyfe, J A, Long, D and Evans, D, 1993. United Kingdom offshore regional report: the geology of the Malin - Hebrides sea area (London: HMSO for the British Geological Survey). 
Hesselbo, S P, Oates, M J and Jenkyns, H C. 19998. The Lower Lias Group of the Bebrides Basin. Scottish Journal of Geology, Vol.34, Part 1, 23-60. 
Cox, B M, Page, K N and Morton, N, 2002. The Middle Jurassic stratigraphy of Scotland. In Cox, B M and Sumbler, M G (editors), British Middle Jurassic Stratigraphy. Geological Conservation Review Series, Vol.26. (Peterborough: Joint Nature Conservation Committee/Chapman and Hall.) 
Morton, N. 1999b. Middle Hettangian (Lower Jurassic) ammonites from the Isle of Raasay, Inner Hebrides, and correlation of the Hettangian - lowermost Sinemurian Breakish Formation in the Skye area, north-western Scotland. Scottish Journal of Geology, Vol.35, Part 2, 119-130. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S071 S081 S044 S044 S080 S051 S052 S081