| Computer Code: |
PRES |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Lutetian Age (GL)
— Priabonian Age (GI) |
| Lithological Description: |
The Prestwich Formation consists of an alternation of fine to medium grained sandstones with green-grey to grey-green silty mudstones. Two sandstone units are present. The lower sandstone displays wireline-log signatures indicative of upward coarsening, whereas the upper sandstone possess a sharp base and displays a more or less consistent log character. |
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
The Prestwich Formation is about 450 m thick in well 49/1-2. |
| Geographical Limits: |
The Prestwich Formation is best represented close to the boundary between quadrants 44 and 49. The formation probably extends northwestwards into Quadrant 36, although information is limited to a single section in well 36/15-1. This section shows a series of sandstone units in the upper part of the Tertiary succession; the thicker sandstone units are tentatively assigned to the Nordland Group and Westray Group (Skade Formation) and only the thin, basal sandstone unit is here assigned to the Prestwich Formation. This interpretation is based on regional trends in thickness distribution. |
| Parent Unit: |
Stronsay Group (STRY)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
North Sea well 49/01- 2: 838-1285.5 m (2749-4217 ft) (Lott and Knox, 1994). |
| Reference(s): |
| Lott, G K and Knox, R W O'B. 1994. 7. Post-Triassic of the Southern 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, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. |
| Curry, D, Adams, C G, Boulter, M C, Dilley, F C, Eames, F E, Funnell, B M, and Wells, M K. 1978. A Correlation of Tertiary rocks in the British Isles. Geological Society of London Special Publication, Vol. 12, 1-72. |
| Knox, R W O'B and Holloway, S. 1992. 1. Paleogene 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
