The BGS Lexicon of Named Rock Units — Result Details

Dodman Formation

Stratotypes:
Computer Code:	DMN	Preferred Map Code:	DMP
Status Code:	Full
Age range:	Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description:	Meta-sandstone and meta-siltstone turbidite beds (to 2m) with thinner interbeds of grey meta-mudstone, which is phyllitic towards the base and schistose at the top of the exposed sequence.
Definition of Lower Boundary:	Dodman Thrust.
Definition of Upper Boundary:	Unseen, offshore, but believed to be the Normannian Thrust.
Thickness:	Incomplete, c.1000m onshore.
Geographical Limits:	Headland between Mevagissey Bay and Veryan Bay, southeast of thrust between Hemnuck Beach and Gorran Haven, south Cornwall, Channel coast.
Parent Unit:	Not Available (!)
Previous Name(s):	Dodman Series/Dodman Phyllites [Obsolete Name and Code: Use DMN] (-1507) Dodman Series [Obsolete Name and Code: Use DMN] (-214) Dodman Phyllites [Obsolete Name and Code: Use DMN] (-3364)
Alternative Name(s):	none recorded or not applicable
Type Section	Coastal section on the eastern side of Veryan Bay between Hemmick Beach and Dodman Point.
Reference(s):
Reid, C and Teall, J J H, 1907. Geology of the country around Mevagissey. Memoirs of the Geological Survey, Sheet 353 (England and Wales).
Sadler, P M, 1974. An appraisal of the 'Lizard-Dodman-Start Thrust' concept. Proceedings of the Ussher Society, Vol.3, 71-81.
Leveridge, B E, et al, 1984. Thrust nappe tectonics in 'The Devonian of South Cornwall and the western English Channel. 103-112 in Variscan Tectonics of the North Atlantic Region. Hutton, D H W and Sanderson, D J (editors). (Oxford: Blackwell).
McKeown, M C, 1962. Structural studies at Dodman Point, Cornwall. Proceedings of the Ussher Society, Vol.1, 22-23.
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E353 E354

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