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The BGS Lexicon of Named Rock Units — Result Details

Tidal flat deposits

Computer Code: TFD Preferred Map Code: notEntered
Status Code: Index Level
Age range: Holocene Epoch (QH) — Holocene Epoch (QH)
Lithological Description: Tidal flat deposits, including mud flat and sand flat deposits, are deposited on extensive nearly horizontal marshy land in the intertidal zone that is alternately covered and uncovered by the rise and fall of the tide. They consist of unconsolidated sediment, mainly mud and/or sand. They may form the top surface of a deltaic deposit. Normally a consolidated soft silty clay, with layers of sand, gravel and peat. Characteristically low relief.
Definition of Lower Boundary: none recorded or not applicable
Definition of Upper Boundary: none recorded or not applicable
Thickness: none recorded or not applicable
Geographical Limits: none recorded or not applicable
Parent Unit: Intertidal deposits (ITD)
Previous Name(s): Estuarine Alluvium [Obsolete Name And Code: Use TFD] (ESAL)
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
McMillan, A A and Powell, J H. 1999. The classification of artificial (man made) ground and natural superficial deposits. British Geological Survey Research Report, RR/99/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E059 S084 E001 E002 E246 E341 E342 E343 E264 E096 E028 E048