| Computer Code: |
GASH |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| 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 [Obsolete Name and Code: Use GASH]
(-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
|
