| Computer Code: |
UOST |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Bathonian Age (JN)
— Callovian Age (JC) |
| Lithological Description: |
This Member records the major Callovian transgression in Europe. Mudstone and siltstones predominate with a low-diversity bivalve fauna. "Ostrea" is anomalous as they are not the dominant fossils. Unit is present in the Staffin Bay area of northern Skye, but absent farther south. |
| Definition of Lower Boundary: |
Sharp base, dark clay with plant fragments, thin shell beds of Neomiodon and Isognomon, mudstones and shell-rich beds - indicative of a gentle, lagoonal transgression. |
| Definition of Upper Boundary: |
Gradationally overlain by sandstone of the 'Belemnite Sands'. |
| Thickness: |
11m+ |
| Geographical Limits: |
Sea of the Hebrides Basin. |
| Parent Unit: |
Staffin Bay Formation (STBA)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Staffin Bay, Trotternish, northern Skye. Morton and Hudson, 1995. |
| Reference(s): |
| 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.) |
| Hudson, J D, and Trewin, N H. 2002. Jurassic. 323-350 in The geology of Scotland. Trewin, N H (editor). (London: Geological Society of London.) |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S080
S090
|
