The BGS Lexicon of Named Rock Units — Result Details

Ouse-Nene Catchments Subgroup

Computer Code: ONCA Preferred Map Code: notEntered
Status Code: Full
Age range: Mid Pleistocene Epoch (QPM) — Holocene Epoch (QH)
Lithological Description: The Ouse-Nene Catchments Subgroup encompasses all the fluvial, lacustrine and organic deposits of the rivers that occupy the catchment area of the rivers Ouse and Nene and their tributaries. Floodplain alluvium comprises soft silts and clays, commonly with beds of peat and a basal bed of sand and gravel. River terrace deposits are largely sand and gravel, the constituents of the gravel components reflecting the source rocks in each catchment. Lacustrine deposits are dominantly soft silts and clays. Minor marine deposits are included where they are intercalated in dominantly fluvial formations.
Definition of Lower Boundary: Formations of the Ouse-Nene Catchments Subgroup rest with marked unconformity on Middle Pleistocene glacial deposits and on Cretaceous and Jurassic bedrock.
Definition of Upper Boundary: Surface.
Thickness: To c.14m
Geographical Limits: The entire catchments of the rivers Nene and Ouse and their tributaries including the Nar, Cam, Lark, Slea and Witham.
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The valleys of the rivers Nene and Ouse and their tributaries in eastern England. 
Reference(s):
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable