The BGS Lexicon of Named Rock Units — Result Details

Armsheugh Sand and Gravel Formation

Computer Code: AHSG Preferred Map Code: notEntered
Status Code: Full
Age range: Wolstonian Stage (QO) — Devensian Stage (QD)
Lithological Description: Sand and gravel, horizontal and cross stratified, interpreted to represent longtitudinal bars of proximal to medial reaches of a glaciofluvial outwash fan.
Definition of Lower Boundary: Sharp, irregular, erosional contact with underlying clay-rich gravel or clayey sand of the Lawthorn Diamicton Member, with relief amplitude of about 3.5m.
Definition of Upper Boundary: Sharp, conformable contact with laminated sand and organic-rich clay and silt of the Sourlie Organic Silt Formation.
Thickness: To 5.5m
Geographical Limits: Probably local to west Ayrshire.
Parent Unit: Midland Valley Glacigenic Subgroup (MVG)
Previous Name(s): Unit C of Jardine et al., 1988 (-635)
Alternative Name(s): Armsheugh Member
Stratotypes:
Type Section  Former Sourlie Opencast Coal Site, excavated into the northwest side of Sourlie Hill, 3.5km northeast of Irvine, Ayrshire. Jardine et al., 1988. 
Reference(s):
Jardine, W G, Dickson, J H, Haughton, P D W, Harkness, D D, Bowen, D Q and Sykes, G A. 1988. A late Middle Devensian interstadial site at Sourlie, near Irvine, Strathclyde. Scottish Journal of Geology, Vol.24, 288-295. 
Bos, J A A, Dickson, J H, Coope, G R and Jardine, W G. 2004. Flora, fauna and climate change of Scotland during the Weichselian Middle Pleniglacial - palynological, macrofossil and coleopteran investigations. Palaeogeography, Palaeoclimatology and Palaeoecology, Vol.204, 65-100. 
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable