The BGS Lexicon of Named Rock Units — Result Details

Drummournie Biogenic Member

Computer Code: DMBG Preferred Map Code: DRM
Status Code: Full
Age range: Ipswichian Stage (QI) — Ipswichian Stage (QI)
Lithological Description: Pebbly, sandy, clayey silt (diamicton), very dense, crudely laminated, fissile, olive grey, with wisps of white silty pebbly sand, disseminated peaty material and charcoal. Pebbles are bleached white. Containing pollen of Interglacial vegetation.
Definition of Lower Boundary: Gradational contact over 10cm or so with white, clayey, silty gravel of the Rehiran Cryoturbate Member below.
Definition of Upper Boundary: Sharp, gently undulating, unconformable contact with stony sandy clay diamicton of the Athais Till Formation.
Thickness: 0.6m
Geographical Limits: Sheet 84W (Fortrose), southeast of Inverness.
Parent Unit: Dalcharn Palaeosol Formation (DNPS)
Previous Name(s): Dalcharn Biogenic Member (-3999)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Exposed towards the base of river cliff sections of the Allt Dearg, 6 km southwest of Cawdor, Nairnshire, at the Dalcharn Interglacial site. Walker, M J C and 6 others. 1992. 
Reference(s):
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
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. 
Sutherland D G and Gordon, J E. (editors). 1993. The Quaternary of Scotland. Geological Conservation Review Series: 6. London: Chapman and Hall. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S084