The BGS Lexicon of Named Rock Units — Result Details
Burton Formation
Computer Code: | BURT | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Pliensbachian Age (JE) — Pliensbachian Age (JE) | ||
Lithological Description: | Dark grey to reddish grey, soft, slightly carbonaceous, non-calcareous mudstones. Ooliths locally occur in the mudstones in the upper part. Thin, varicoloured, very fine- to coarse-grained, argillaceous sandstones occur locally, and may be kaolinitic and/or calcareous. | ||
Definition of Lower Boundary: | The lower boundary is defined by a downward change from mudstones to interbedded sandstones and siltstones (Amundsen Formation). A weak downward decrease in gamma values and increase in velocity occurs across the boundary. | ||
Definition of Upper Boundary: | The upper boundary is typically characterised by a downward change from siltstone or sandstone (Cook Formation) to mudstone and a distinct down-section increase in gamma values and decrease in velocity. Locally development of sandstone in the Burton Formation (e.g. 3/4-8) makes the boundary difficult to locate. Local anomalously high gamma values in the Cook Formation mean that the boundary is best defined by the down-section decrease in velocity on wireline logs. | ||
Thickness: | Up to 65 m, but absent on some structural highs. | ||
Geographical Limits: | East Shetland Basin and eastwards into the Viking Graben. North Sea quadrants 2, 3, 210, and 211. | ||
Parent Unit: | Dunlin Group (DUNL) | ||
Previous Name(s): | Burton Sub-Unit
(-5181)
Dunlin Siltstone Member (-5175) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | North Sea well 211/29- 3 between 2950.5 and 2993 m below KB (Deegan and Scull, 1977). | ||
Reference Section | North Sea well 211/18a- 24 between 3704.5 m and 3737 m (Richards et al., 1993). | ||
Reference Section | North Sea well 211/27- 4A between 3769 and 3787.5 m (Richards et al., 1993). | ||
Reference Section | North Sea well 3/04- 8 between 3526.5 and 3590 m (Richards et al., 1993). | ||
Reference(s): | |||
Deegan, C E and Scull, B J. 1977. A standard lithostratigraphic nomenclature for the Central and Northern North Sea. Report of the Institute of Geological Sciences, 77/25; NPD Bulletin No.1. | |||
Bowen, J M. 1975. The Brent Oil-Field. In: Woodland, A W (ed.) Petroleum and the contineental shelf of North-West Europe, 353-361. [Heyden & Son, London] | |||
Richards, P C, Lott, G K, Johnson, H, Knox, R W O'B. and Riding, J B. 1993. 3. Jurassic of the Central and Northern North Sea. In: Knox, R W O'B and Cordey, W G (eds.). Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. | |||
Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
none recorded or not applicable |