The BGS Lexicon of Named Rock Units — Result Details

Auchleuchries Sand and Gravel Formation

Computer Code: ALSSG Preferred Map Code: AU
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: A mostly pale yellowish brown pebbly sand, containing a relatively large proportion of pink granite and seams of chocolate brown or dark grey clay, which is interpreted as having been derived from the underlying Pitlurg Till Formation.
Definition of Lower Boundary: A sharp, undulating, erosional, unconformable contact with dark grey, pebbly clay diamicton of the Pitlurg Till Formation.
Definition of Upper Boundary: Sharp, planar or gradational glacitectonic, unconformable contact with a reddish brown, gravelly sandy clay diamicton of the Hatton Till Formation, and elsewhere overlain by yellowish brown, gravelly clayey sand diamictons of the East Grampian Glacigenic Subgroup, which contain psammite, metagreywacke and granite clasts.
Thickness: To 12m
Geographical Limits: Eastern Aberdeenshire.
Parent Unit: Logie-Buchan Glacigenic Subgroup (LBD)
Previous Name(s): Glacial Sand And Gravel (GSG)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  BGS registered borehole NK03NW/01, sited on the hill of Auchleuchries, 8km northeast of Ellon, Aberdeenshire. Merritt, 1981. 
Reference Section  Trial pits dug in the vicinity of Bellscamphie railway cutting, 8km eastnortheast of Ellon, Aberdeenshire. Hall and Jarvis, 1995. 
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 north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland) 
Hall, A M and Jarvis, J. 1995. A multiple till sequence near Ellon, Grampian Region: T F Jamieson's "indigo boulder clay" re-examined. Scottish Journal of Geology, Vol.31, 53-59. 
Merritt, J W. 1981. The sand and gravel resources of the country around Ellon, Grampian Region. Description of 1:25 000 resource sheet NJ93 with parts of NJ82, NJ83 and NJ92, NK03 and parts of NK02 and NK13. Mineral assessment Report of the Institute of Geological Sciences, No. 76. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S087