Computer Code: |
LBSH |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
Lithological Description: |
Very poorly sorted accumulations of shells and shell fragments, with sporadic pebbles, set in a very soft, dark greyish brown (2.5Y 4/2), muddy sandy matrix. Shell concentrations dominated by Chlamys islandica and Arctica islandica, with subordinate Tridonta elliptica. |
Definition of Lower Boundary: |
Unconformable on the Assynt Glacigenic Formation. |
Definition of Upper Boundary: |
In outer Loch Broom, it is unconformably overlain by the Summer Isles Formation; in the inner loch, it is overlain by the Rhiroy Member of the Assynt Glacigenic Formation. |
Thickness: |
0.64-0.68 m thick. |
Geographical Limits: |
Loch Broom (as presently known) |
Parent Unit: |
Not Entered (?)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
57.9144 deg N, 05.2213 deg W. BGS vibrocore 57-06/269, a 0.68 m-thick bed between 1.0 and 1.68 m below sea bed, outer Loch Broom (Stoker and Bradwell, in press). |
Reference Section |
57.8655 deg N, 05.1063 deg W. BGS vibrocore 57-06/267, between 3.4 and 4.04 m below sea bed, inner Loch Broom (Stoker and Bradwell, in press). |
Reference(s): |
Stoker, M S and Bradwell, T. In press. Quaternary geology of the Summer Isles region - a brief explanation of the marine environment map. Sheet Explanation of the British Geological Survey. 1:50 000 Special Sheet Summer Isles (Scotland). |
Stoker, M S, Bradwell, T, Howe, J A, Wilkinson, I P & McIntyre, K. 2009. Lateglacial ice-cap dynamics in NW Scotland: evidence from the fjords of the Summer Isles region. Quaternary Science Reviews, 28, 3161-3184. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
none recorded or not applicable |