The BGS Lexicon of Named Rock Units — Result Details

Sourlie Organic Silt Formation

Computer Code: SOSI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Mainly dark brown, laminated organic silt and clay containing fragments of bone, antler and plant debris, with lenses of pebbly sand, pale and dark brown silt, black silty clay and about 30cm of pale grey to white clay at the base. Containing a rich fauna and flora of Middle Devensian age, including bone of woolly rhinoceros and reindeer. Radiocarbon dates on antler fragments range between 33.5 and 29.0 ka BP.
Definition of Lower Boundary: Sharp, conformable contact with sand and gravel of the Armsheugh Sand and Gravel Formation at 10.82m above OD.
Definition of Upper Boundary: Sharp unconformable, planar to gently undulating contact with pinkish brown shelly clayey diamicton of the Eglinton Shelly Till Member at 11.10m above OD.
Thickness: To 1.5m
Geographical Limits: West central Scotland.
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): Unit D (-3042)
Alternative Name(s): Red Burn 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):
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. 
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. 
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