The BGS Lexicon of Named Rock Units — Result Details
Auchmeddon Gravel Member
Computer Code: | AMNGR | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Devensian Stage (QD) — Devensian Stage (QD) | ||
Lithological Description: | Gravel. Interpreted as glaciofluvial outwash. Grey, pebble to boulder grade. Clast-supported with a medium to coarse quartzose sand matrix. Clasts are subrounded to rounded and composed mainly of quartzite (probably reworked from underlying gravel deposits and Devonian conglomerates) - other lithologies are rare. The gravels are crudely horizontally bedded with local sand interbeds displaying horizontal stratification. Clast imbrication measurements indicates palaeocurrents flowing towards the south. | ||
Definition of Lower Boundary: | The lower boundary of the formation is a scoured, undulatory erosion surface (amplitude about 1.0m) on reddish brown diamicton of the Byth Till Formation. | ||
Definition of Upper Boundary: | The formation either occurs at the present ground surface or is overlain by Holocene peat or alluvial sediments. | ||
Thickness: | To 3m | ||
Geographical Limits: | Buchan, northeast Scotland. The member is only known from the vicinity of the Howe of Byth Quarry on Sheet 97 (Fraserburgh). | ||
Parent Unit: | Blackhills Sand and Gravel Formation (BLSG) | ||
Previous Name(s): | Glacial meltwater deposits [Obsolete Name and Code: Use GFDU]
(-4430)
Auchmeddon Member [Obsolete Name and Code: Use AMNGR] (-3166) Auchmeddon Gravel [Obsolete Name and Code: Use AMNGR] (-1948) Auchmeddon Gravel Formation [Obsolete Name and Code: Use AMNGR] (-1949) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | North face (as at May 2002) of Howe of Byth Quarry, 18km southwest of Fraserburgh, Buchan, northeast Scotland. Hall et al. 1995. | ||
Reference(s): | |||
Merritt, J W, Connell, E R and Bridgland, D R (editors). 2000. The Quaternary of the Banffshire Coast and Buchan; Field Guide. (London: Quaternary Research Association.) | |||
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) | |||
Connell, E R. 2002. Stratigraphical investigations at three key Quaternary sites in northeast Scotland. Quaternary Newsletter, 98, 29-32. | |||
Duller, G A T, Wintle, A F and Hall, A M. 1995. Luminescence dating and its application to key-pre-Late Devensian sites in Scotland. Quaternary Science Reviews, Vol.14, 495-519. | |||
Hall, A M, Duller G A T, Jarvis, J and Wintle, A G. 1995. Middle Devensian ice-proximal gravels at Howe of Byth, Grampian Region. Scottish Journal of Geology, Vol.31, 61-64. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |