The BGS Lexicon of Named Rock Units — Result Details

Garantiana Mudstone Member

Computer Code: GASH Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Bajocian Age (JB) — Bajocian Age (JB)
Lithological Description: Dark mudstones and clays with rare calcareous nodules mark the commencement of the Member. North of Skye the mudstones and siltstones pass laterally into calcareous sandstones.
Definition of Lower Boundary: Abrupt lithology change from Druim an Fhurian Sandstone Formation.
Definition of Upper Boundary: Basinwide unconformity, overlain by mudstones of the Great Estaurine Group.
Thickness: 3m
Geographical Limits: Sea of the Hebrides Basin.
Parent Unit: Bearreraig Sandstone Formation (BEAS)
Previous Name(s): Garantiana Shale Member (-3415)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Gualann na Leac viewpoint, near Rubha na Leac, Hallaig, Raasay. 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. 
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.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S071 S081