The BGS Lexicon of Named Rock Units — Result Details

Yorkshire Catchments Subgroup

Computer Code: YKC Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: The Yorkshire Catchments Subgroups include clay, silt, sand, gravel, boulders and peat deposited mainly by alluvial, aeolian and slope movement processes.
Definition of Lower Boundary: Unconformable contact with older superficial deposits including units of the North Pennine, North Sea Coast and Central Cumbria Glacigenic subgroups, and bedrock.
Definition of Upper Boundary: Generally the ground surface, but units of this subgroup locally interfinger with units of the British Coastal Deposits Group.
Thickness: Alluvial and terrace deposits may reach up to a maximum of around 25m. The individual formations and members in the subgroup are highly variable in thickness.
Geographical Limits: Yorkshire, east of the Pennine watershed, including the valleys of the rivers Swale, Nidd, Aire, Ouse, Derwent and Wharfe and all their tributaries that flow from the north and west into the Humber.
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): Yorkshire Catchments Group (-4411)
Alternative Name(s): none recorded or not applicable
Type Area  Fluvial, organic, aeolian and mass movement deposits of Lincolnshire and Yorkshire east of the Pennines watershed. See also the stratotypes of constituent formations. 
McMillan, A A. 2005. A provisional Quaternary and Neogene lithostratigraphical framework for Great Britain. (Netherlands: Journal of Geosciences), 84-2, 87-107. 
Boulton, G S. 1992. Quaternary. 413-444 in Duff, P M D and Smith, A J (eds) Geology of England and Wales. [London: The Geological Society.] 
McMillan, A A, Hamblin, R J O and Merritt, J W. 2005. An overview of the lithostratigraphical framework for the Quarternary and Neogene deposits of Great Britain (onshore). British Geological Survey Research Report RR/04/04. 
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