OR/14/008 Obsolete lithostratigraphic terms and codes: Difference between revisions
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|+ Table 2 Stratigraphical hierarchy in the Palaeogene of the London Basin. | |+ Table 2 Stratigraphical hierarchy in the Palaeogene of the London Basin. | ||
| '''Group''' | | '''Group''' | ||
| '''Formation''' | | '''Formation''' |
Revision as of 10:29, 9 November 2021
Aldiss, D T. 2014. The stratigraphical framework for the Palaeogene successions of the London Basin, UK. Nottingham, UK, British geological Survey. (OR/14/008) |
This list is in alphabetical order of Lexicon Codes (The BGS Lexicon of named rock units). It is mainly restricted to unit names used on BGS maps and in other BGS publications, with entries in the BGS Lexicon.
Extant Lexicon code | Obsolete Lexicon code | Obsolete name | Current name for equivalent or part-equivalent |
BBD | Reading Bottom Bed | Upnor Formation | |
BGB | Bagshot Beds | Part of Bracklesham Group | |
BGBL | Lower Bagshot Beds | Near-equivalent to Bagshot Formation | |
BGBM | Middle Bagshot Beds | Near-equivalent to Windlesham Formation | |
BGBR | Bagshot Beds and Bracklesham Beds (undifferentiated) | Part of Bracklesham Group | |
BGBU | Upper Bagshot Beds | Camberley Sand Formation | |
BLB | Blackheath Beds | Blackheath Member | |
HAC | Hales Clay Member | Orwell Member (Harwich Formation) and Upnor Formation | |
LCBA | London Clay Basement Bed | Equivalent or part equivalent to Walton Member or Harwich Formation | |
LLTE | Lower London Tertiaries | Harwich Formation, Lambeth Group and Thanet Formation, undifferentiated | |
MCL | Mottled Clay (Reading Formation) | Reading Formation | |
OH | Oldhaven Beds | Oldhaven Member | |
RFBB | Reading Formation Basement Bed | Upnor Formation | |
TAB | Thanet Sand Formation | Thanet Formation | |
TS | Thanet Sand | Thanet Formation | |
WLOH | Woolwich Beds – Oldhaven Beds | Woolwich Formation and Harwich Formation undifferentiated | |
WRB | Woolwich and Reading Beds Formation | Woolwich Formation and Reading Formation undifferentiated | |
Blackwall Rock | not known |
PERIOD | EPOCH | AGE/STAGE | Age of base (Ma) | |
QUATERNARY | Holocene Pleistocene |
2.59 | ||
NEOGENE | Pliocene | 5.33 | ||
Miocene | 23.03 | |||
PALAEOGENE | Late | Oligocene | Chattian | 28.4 |
Early | Rupelian | 33.9 | ||
Late | Eocene | Priabonian | 37.2 | |
Mid | Bartonian | 40.4 | ||
Lutetian | 48.6 | |||
Early | Ypresian | 55.8 | ||
Late | Paleocene | Thanetian | 58.7 | |
Selandian | 61.1 | |||
Early | Danian | 65.5 |
From Ogg et al. (2008)[1], and from King (2006)[2] after Berggren et al. (1995)[3].
Age/Stage names for the Neogene and Quaternary have been omitted for simplicity.
Group | Formation | Member | Bed |
Bracklesham | Camberley Sand | ||
Windlesham | Stanners Hill Pebble | ||
Bagshot | Swinley Clay | St Ann’s Hill Pebble | |
Thames | London Clay | Claygate Sheppey Aveley Ockendon Walton |
|
Harwich | Swanscombe Oldhaven Blackheath Wrabness Orwell |
Lessness Shell Harwich Stone Band Suffolk Pebble | |
Lambeth | Woolwich | Woolwich Sands Upper Shelly Clay Striped Loams Laminated Beds Lower Shelly Clay Shorne |
Cobham Lignite |
Reading | Upper Mottled Clay Lower Mottled Clay |
||
Upnor | |||
Montrose | Thanet | Reculver Sand Pegwell Silt Kentish Sands Stourmouth Silt Base Bed |
|
Cliffs End Greensand Bullhead | |||
Lista | Ormesby Clay |
Note that in normal usage, unit names are terminated by the rank term at the head of the column, other than those shown in italic script, which are informal.
Warburton 1822[4] | Prestwich 1847[5] | Dewey and Bromehead 1915[6] | King 1981[7] | Bristow 1982[8] | Curry 1992[9] | Current BGS Framework | |||
London Basin | Hampshire Basin | ||||||||
Younger beds have been removed by erosion | Barton Formation | Bracklesham Group | |||||||
Selsey Sand Formation | |||||||||
Bagshot Sand | Upper Bagshot Sands | Barton Beds | Bagshot Formation | Camberley Sand Formation | Bracklesham Group | ||||
Middle Bagshot Sands | Bracklesham Beds | Middle Bagshot Beds Middle unit Lower unit |
Windlesham Formation | ||||||
Marsh Farm Formation | |||||||||
Earnley Sand Formation | |||||||||
Swinley Clay Member Bagshot Formation |
Wittering Formation | ||||||||
Lower Bagshot Sands | Bagshot Beds | Virginia Water Formation | Bagshot Beds | ||||||
London Clay Formation |
Taken from a draft document prepared by R A Ellison and I T Williamson, BGS, in 1998.
References
- ↑ OGG, J G, OGG, G, and GRADSTEIN, F M. 2008. The concise geologic time scale. (Cambridge: Cambridge University Press.)
- ↑ KING, C. 2006. Paleogene and Neogene: uplift and a cooling climate. 395–427 in The geology of England and Wales. BRENCHLEY, P J, and RAWSON, P F (editors). (The Geological Society, London.)
- ↑ BERGGREN, W A, KENT, D V, SWISHER, C C, and AUBRY, M-P. 1995. A revised Cenozoic geochronology and chronostratigraphy. 129–212 in Geochronology, time scales and global stratigraphic correlation. BERGGREN, W A, KENT, D V, AUBRY, M-P, and HARDENBOL, J (editors). SEPM Special Publication, No. 54.
- ↑ WARBURTON, H. 1822. III.—On the Bagshot Sand. Transactions of the Geological Society of London, Vol. Series 2, Volume 1, 48–52.
- ↑ PRESTWICH, J. 1847. On the main points of structure and the probable age of the Bagshot Sands, and on their presumed equivalents in Hampshire and France. Quarterly Journal of the Geological Society, London, Vol. 3, 378–409.
- ↑ DEWEY, H, and BROMEHEAD, C E N. 1915. The geology of the country around Windsor and Chertsey. Memoir of the Geological Survey of Great Britain, Sheet 269 (England and Wales).
- ↑ KING, C. 1981. The stratigraphy of the London Clay and associated deposits. Tertiary Research Special Paper. No. 6. (Rotterdam: Dr W Backhuys.)
- ↑ BRISTOW, C R. 1982. The nomenclature of the Bagshot and the Claygate Beds of London and Essex. Tertiary Research, Vol. 4 (1), 7–8.
- ↑ CURRY, D. 1992. Tertiary. 389–411 in Geology of England and Wales. DUFF, P M D, and SMITH, A J (editors). (London: The Geological Society.)