Category:Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns: Difference between revisions
No edit summary |
No edit summary |
||
Line 5: | Line 5: | ||
| colspan="2" | KEY MARKER BEDS | | colspan="2" | KEY MARKER BEDS | ||
|- | |- | ||
| <br>Upper Chalk<br><br> | | <br><br>Upper Chalk<br><br><br> | ||
| | | | ||
| Rowspan="6" colspan="2"| (Clandon Hardground)<br><br>(Top Rock)<br><br>(Melborm Rock) | | Rowspan="6" colspan="2"| (Clandon Hardground)<br><br>(Top Rock)<br><br>(Melborm Rock) |
Revision as of 14:33, 7 October 2013
The Chalk Group of this region has some distinct lithostratigraphical features compared to adjacent areas. In the Lower Chalk, an erosive calcarenite (Totternhoe Stone) has removed part of the succession, and in the Middle and Upper Chalk there is a variably developed series of hardgrounds (the Chalk Rock & Top Rock), that condense out parts of the thicker successions seen in the Southern Region. The lithostratigraphical scheme of Bristow et al. (1997) remains largely untested over the region (Wood, 1996), parts of which have recently been mapped by the BGS (e.g. Shephard-Thorn et al., 1994) following the traditional tripartite subdivision of the Chalk outlined by Jukes-Browne & Hill (1903, 1904). The following summarises the lithostratigraphical nomenclature applicable to the region:
FORMATION | MEMBERS | KEY MARKER BEDS | |
Upper Chalk |
(Clandon Hardground) (Top Rock) (Melborm Rock) | ||
Middle Chalk | |||
Lower Chalk | Plenus Marls | ||
Grey Chalk | |||
Tottomhow Stone | |||
Chalk Marl | |||
Glauconitic Marl/ Cambridge Greensand |
References
BRISTOW, C. R., MORTIMORE, R. N. & WOOD, C. J. 1997. Lithostratigraphy for mapping the Chalk of southern England. Proceedings of the Geologists' Association, Vol. 108, 293-315.
JUKES-BROWNE, A J & HILL, W.1903. The Cretaceous rocks of Britain. Vol. 2 - The Lower and Middle Chalk of England. Memoir of the Geological Survey of the United Kingdom.
JUKES-BROWNE, A J & HILL, W.1904. The Cretaceous rocks of Britain. Vol. 3 - The Upper Chalk of England. Memoir of the Geological Survey of the United Kingdom.
SHEPHARD-THORN. E. R., MOORLOCK, B. S. P., COX, B. M., ALLSOP, J. M. & WOOD, C. J. 1994. Geology of the country around Leighton Buzzard. Memoir of the British Geological Survey, Sheet 220 (England & Wales).
WOOD, C. J. 1996. Upper Cretaceous: the Chalk Group. In SUMBLER, M. G., British Regional Geology: London and the Thames Valley. Fourth Edition. (London: HMSO for the British Geological Survey).
Pages in category "Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns"
The following 17 pages are in this category, out of 17 total.
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Glauconitic Marl
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Cambridge Greensand
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Chalk Marl
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Totternhoe Stone
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Grey Chalk
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Plenus Marls
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Middle Chalk
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Melbourn Rock
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Lower Chalk
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Upper Chalk
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Chalk Rock
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Chalk Rock: Bottom Hardground Suite
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Fognam Marl
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Chalk Rock: Middle Hardground Suite
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Chalk Rock: Top Hardground Suite
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Top Rock
- Chalk Group Lithostratigraphy: Marlborough Downs/Berkshire Downs/Chilterns - Clandon Hardground