The BGS Lexicon of Named Rock Units — Result Details

Yarmouth Roads Formation

Computer Code: YM Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Marine Isotope Stage 62 (QMIS062) — Marine Isotope Stage 13 (QMIS013)
Lithological Description: Fine or medium-grained grey-green sands, typically non-calcareous, with variable clay lamination and local intercalations of reworked peat. Characteristic chaotic reflector configuration in seismic profiles, presumed mainly fluviatile, with possible shallow marine incursions.
Definition of Lower Boundary: Unconformably overlies early Pleistocene Westkapelle Ground, Smith's knoll, Ijmuiden Ground or Winterton Shoal Formations.
Definition of Upper Boundary: Unconformably overlain by Middle and Upper Pleistocene formations, and subcrops below Holocene sands in parts of British Sector.
Thickness: 0 - 100 metres.
Geographical Limits: Not defined.
Parent Unit: Dunwich Group (DUNW)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
Cameron, T D J, Laban, C, and Schuttenhelm, R T E. 1984. Solid Geology, Quaternary Geology and Sea-Bed Sediments of the United Kingdom and Continental Shelf. British Geological Survey, 1:250 000 series, 52N-02E Quaternary: Flemish Bight, Quaternary Geology, MR/85/38. (Southampton: Ordnance Survey for the British Geological Survey.) 
Stoker, M S, Balson, P S, Long, D, and Tappin, D R. 2011. An overview of the lithostratigraphical framework for the Quaternary deposits on the United Kingdom continental shelf. British Geological Survey Research Report, RR/11/03. 48pp. 
Cameron, T D J, Crosby, A, Balson, P S, Jeffery, D H, Lott, G K, Bulat, J, and Harrison, D J. 1992. United Kingdom offshore regional report: the geology of the southern North Sea. (London: HMSO for the British Geological Survey.) 
Cameron, T D J, and Holmes, R. 1999. The Continental Shelf. 125-139 in A revised correlation of Quaternary deposits in the British Isles. Bowen, D Q (editor). Special Report of the Geological Society of London, No. 23. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable