The BGS Lexicon of Named Rock Units — Result Details

Crossbrae Farm Peat Bed

Computer Code: CBFMP Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Peat, black and dark brown, variably sandy, with laminae and thin beds of variably organic silty grey medium sands and quartzose medium to coarse sand. The most recent C14 dates indicate age of the bed is >61,900 years BP (SRR-5707). Interpreted as have formed under cold interstadial climate conditions in dwarf shrub tundra (combined evidence from pollen, plant macrofossils and coleoptera).
Definition of Lower Boundary: Overlies Devonian red brown sandstone bedrock in sharp unconformity, and is inferred to overlie the Crossbrae Till Formation.
Definition of Upper Boundary: A sharp unconformity with unnamed sand and gravel unit, which is in turn overlain by bedded diamicton of the Crossbrae Gelifluctate Bed. Elsewhere it is inferred that the peat bed was directly overlain by the Crossbrae Gelifluctate Bed.
Thickness: To 0.55m
Geographical Limits: Buchan, northeast Scotland. The bed is known only from the vicinity of Crossbrae Farm, Turrif on Sheet 86E (Turrif).
Parent Unit: Crossbrae Till Formation (CBTIL)
Previous Name(s): Crossbrae Member (-4520)
Crossbrae Farm Peat Bed (CBFMP)
Crossbrae Member, Kirkhill Formation (-754)
Crossbrae Peat (-2666)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Geological test pit (Site B), near Crossbrae Farm, 3km northeast of Turrif, Buchan, northeast Scotland. Whittington et al., 1998. 
Reference Section  Temporary drainage pipe excavation (Site A, pit 2), near Crossbrae Farm, 3km northeast of Turrif, Buchan, northeast Scotland. Whittington et al., 1998. 
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) 
Sutherland, D G. 1999. Scotland. 99-114 in Bowen D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. Special Report of The Geological Society of London, No.23. 
Hall, A M (Editor). 1984. Buchan Field Guide. Quaternary Research Association, Cambridge, 120pp. 
Connell, E R and Hall, A M. 1987. The periglacial history of Buchan, Scotland. 277-285 in Boardman, J (Editor), Periglacial Processes and Landforms in Britain and Ireland. Periglacial processes in Britain and Ireland. Cambridge University Press, Cambridge. 
Hall, A M and Connell, E R. 1991. The glacial deposits of Buchan, northeast Scotland. 129-136 in Ehlers, J, Gibbard, P L and Rose, J (editors), Glacial Deposits in Great Britain and Ireland. (Rotterdam: Balkema.) 
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.) 
Whittington, G. 1994. Bruckenthalia spicufolia (Salisb.). Reichemb. (Ericaceae), in the Late Quaternary of western Europe. Quaternary Science Reviews, Vol.13, 761-768. 
Whittington, G, Connell, E R, Coope, G R, Edwards, K J, Hall, A M, Hulme, P D and Jarvis, J. 1998. Devensian organic interstadial deposits and ice sheet extent in Buchan, Scotland. Journal of Quaternary Science, Vol.13, 309-324. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable