The BGS Lexicon of Named Rock Units — Result Details

Aldie Till Member

Computer Code: ALDTI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Gravelly clayey sand and diamicton (till), greenish grey (5GY 6/1), stiff, massive to crudely-horizontally bedded, with broken rounded pebbles and cobbles of flint and quartzite reworked from the Buchan Ridge Gravels Formation, together with sparse mica schist, granite, mafic igneous and red sandstone clasts. The matrix is kaolinitic quartz sand. The lithology of the till varies laterally with the underlying bedrock. It thickens to the south and east of the Moss of Cruden, where it includes red granite and has a weak NW-SE clast fabric. The till locally incorporates large masses of weathered brown sand with sparse quartzite clasts of unknown derivation and origin.
Definition of Lower Boundary: Sharp, interdigitating glacitectonic boundary with compressed peat and organic sand of the Berryley Peat Bed or with a local unit of Head named informally as the Hardslacks Gelifluctate Bed; or an apparently gradational contact with dark grey diamicton of the Camp Fauld Till Formation; or on bedrock.
Definition of Upper Boundary: Unconformable contact with red clayey diamicton of the Logie-Buchan Glacigenic Subgroup, or head deposits.
Thickness: <10m
Geographical Limits: Moss of Cruden, Buchan.
Parent Unit: Whitehills Glacigenic Formation (WHGL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Camp Fauld, on the southern slope of the Moss of Cruden, about 900m northwest of Moreseat, Buchan. 
Reference(s):
Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of northeast Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland). 
Whittington, G, Hall, A M and Jarvis, J. 1993. A pre-late Devensian pollen site from Camp Fauld, Buchan, northeast Scotland. New Phytologist, Vol.125, 867-874. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable