The BGS Lexicon of Named Rock Units — Result Details
Black Ven Marl Member
Computer Code: | BVM | Preferred Map Code: | BVM |
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Status Code: | Full | ||
Age range: | Sinemurian Age (JS) — Sinemurian Age (JS) | ||
Lithological Description: | Dark grey thinly interbedded mudstones and organic-rich mudstone, with a few thin beds and doggers of muddy limestone. | ||
Definition of Lower Boundary: | Base of Birchi Tabular Limestone (bed 76 of Lang, W D, et al, 1923). Conformable on Shales-with-Beef Member. | ||
Definition of Upper Boundary: | Base of Belemnite Marl Member, at base of hummocky limestone, (Lang, W D, et al, 1922, bed 103). | ||
Thickness: | 43m | ||
Geographical Limits: | Southwest Dorset and southeast Devon, United Kingdom. Mapped on Sheets 326 (Sidmouth) and 327 (Bridport). Northern limit not yet proved. | ||
Parent Unit: | Charmouth Mudstone Formation (CHAM) | ||
Previous Name(s): | Black Marl [Obsolete Name and Code: Use BVM, SHWB]
(-3884)
Black Ven Beds (-96) Black Ven Marls [Obsolete Name and Code: Use BVM] (-2650) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Black Ven, Charmouth, Dorset. Continuous and complete exposure in cliffs. Hesselbo, S P and Jenkyns, H C A, 1995. | ||
Reference(s): | |||
Lang, W D, Spath, L F and Richardson, W A, 1923. Shales-with-'Beef', a sequence in the Lower Lias of the Dorset coast. Quarterly Journal of the Geological Society of London, Vol.79, 47-99. | |||
Wilson, V, Welch, F B A, Robbie, J A, and Green, G W. 1958. Geology of the country around Bridport and Yeovil. Memoir of the Geological Survey of Great Britain, Sheets 327 and 312 (England and Wales). | |||
Woodward, H B and Ussher, W A E, 1911. Sidmouth and Lyme Regis. Memoir of the Geological Survey, Sheets 326 and 340 (England and Wales). | |||
Arkell, W J. 1933. The Jurassic System in Great Britain [Oxford: Clarendon Press.] | |||
Hesselbo, S P and Jenkyns, H C A, 1995. A comparison of the Hettangian to Bajocian successions of Dorset and Yorkshire. 105-150 in Taylor, P D (Editor). Field geology of the British Jurassic (London Geological Society). | |||
Lang, W D, 1914. The geology of Charmouth cliffs, beach and fore-shore. Proceedings of the Geologists' Association, Vol.25, 293-360. | |||
Cope, J C W and others, 1980. A correlation of Jurassic rocks in the British Isles. Part 1: Introduction and Lower Jurassic. Special Report of the Geological Society of London, No.14. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E327 E341 E342 E343 |