The BGS Lexicon of Named Rock Units — Result Details

North Denes Formation

Computer Code: NRD Preferred Map Code: notEntered
Status Code: Full
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: The North Denes Formation consists of an elongate, wedge-shaped body of sand with subordinate gravel and thin layers of silty clay.
Definition of Lower Boundary: The North Denes Formation rests unconformably mostly on the silts, clays and sands of the Breydon Formation, but also on the sands and gravels of the Crag Group, and to a lesser extent on the glacigenic deposits of the Happisburgh Formation.
Definition of Upper Boundary: Surface, or else covered by blown sand.
Thickness: c.26m
Geographical Limits: The formation comprises a coastal barrier, 1km wide by 8km long, between Caister-on-Sea and Gorleston-on-Sea. The present coastline is taken as an arbitary eastern limit.
Parent Unit: British Coastal Deposits Group (COAS)
Previous Name(s): Cerdic Sand (-4225)
Cerdic Shore (-4814)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Marine Outfall Borehole 8, TG50NW/542. Arthurton et al., 1994. 
Reference(s):
Arthurton, R S, Booth, S J, Morigi, A N, Abbott, M A W and Wood, C J. 1994. Geology of the country around Great Yarmouth, Sheet Memoir 162, British Geological Survey. [London: HMSO.] 138pp 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E162