The BGS Lexicon of Named Rock Units — Result Details

Dodman Formation

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 (-1507)
Dodman Phyllites (-3364)
Dodman Series (-214)
Alternative Name(s): none recorded or not applicable
Stratotypes:
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