| Computer Code: |
MBP |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Ipswichian Stage (QI)
— Devensian Stage (QD) |
| Lithological Description: |
Peat, highly compressed, black, < 0.6 m thick, with lenses of pebbly peaty sand and bleached white sand. Contains beetle remains and pollen indicative of (early Devensian) interstadial conditions. Sharp, draped, conformable contact with < 2 m underlying cobble gravel with lenses of finer gravel and sand, mainly clast-supported, containing subangular to rounded clasts of pink granite with psammites, gneiss and schist. All but psammite clasts commonly weathered. Iron pan commonly developed. |
| Definition of Lower Boundary: |
Sharp, erosional, undulating contact with underlying yellowish brown sandy clayey diamicton of the Suidheig Till Formation. |
| Definition of Upper Boundary: |
Unconformable, glacitectonic contact with stiff, yellowish brown, stony sand/clay diamicton of the overlying Athais Till Formation |
| Thickness: |
2.6 m, of which the Allt Odhar Peat Member is 0.6 m. |
| Geographical Limits: |
South-east of Inverness (BGS 1:50 000 Sheet S84W). |
| Parent Unit: |
Britannia Catchments Group (BCAT)
|
| Previous Name(s): |
Separate Allt Odhar Peat and Odhar Gravel Formations [Obsolete Name and Code: Use MBP]
(-390)
|
| Alternative Name(s): |
Allt And Odhar Members Of The Allt Odhar Formation Of Bowen 1999
|
| Stratotypes: |
| Reference Section |
Camp Fauld, Moss of Cruden, west of Peterhead. The Berryley Peat Bed and underlying Moreseat Farm Sand Bed rest unconformably on the Camp Fauld Till Formation. The Moreseat Farm Sand Bed is considered to be Ipswichian (MIS 5e) in age. The Berryley Peat Bed lies below the Aldie Till Member (Whitehills Glacigenic Formation). |
| Type Section |
Exposed midway up a river cliff of the Allt Odhar, immediately upstream of its confluence with the Caochan nan Suidheig, Moy Estate, 16 km south-east of Inverness. Till occurs both lower and higher in this section. Walker et al., 1992. Subdivided into the Allt Odhar Peat Member and Odhar Gravel Member. |
| Reference(s): |
| Sutherland D G and Gordon, J E. (editors). 1993. The Quaternary of Scotland. Geological Conservation Review Series: 6. London: Chapman and Hall. |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). |
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. |
| Walker, M J and 6 others. 1992. Allt Odhar and Dalcharn: two pre-Late Devensian (Late Weichselian) sites in northern Scotland. Journal of the Quaternary Science, Vol.7, 69-86. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
