| Computer Code: |
TAYS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Early Eocene (GEE)
— Mid Eocene (GEM) |
| Lithological Description: |
Thinly or thickly bedded, clean to argillaceous, fine to medium grained sandstones, interbedded with variably silty, fissile, green-grey to grey mudstones and siltstones. Thin turbidite sandstones occur within the mudstone units. |
| Definition of Lower Boundary: |
The base of the Tay Sandstone Member normally rests conformably on a thin unit of Horda mudstone. However, over salt-induced highs in the south of Quadrant 21 it locally rests disconformably on Balder Formation, Sele Formation (e.g. 21/25-6), or Lista Formation (e.g. 21/22-1). |
| Definition of Upper Boundary: |
The top of the Tay Sandstone Member is defined by a downward change from green-grey mudstone to relatively clean sandstone. This is associated with a decrease in gamma-ray values and generally by an increase in velocity (but see 21/25-6). |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
The Tay Sandstone Member is restricted to southern parts of Quadrants 21 and 22. The sandstones show a complex distribution due, in part, to the effects of salt movement during sedimentation (Armstrong et al., 1987). |
| Parent Unit: |
Horda Formation (HORD)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
North Sea well 21/18- 1A: 1687.5-1945 m (5536-6382 ft) below KB (Knox and Holloway, 1992). |
| Reference Section |
North Sea well 21/25- 6: 2057-2145 m (6748-7037 ft) (Knox and Holloway, 1992). |
| Reference(s): |
| 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. |
| Armstrong, L A, Ten Have, A, and Johnson, H D. 1987. The geology of the Gannet Fields, Central North Sea. 533-548 in Petroleum geology of North West Europe. Brooks, J, and Glennie, K W (editors). (London: Graham and Trotman.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
