| Computer Code: |
SKRS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Early Eocene (GEE)
— Early Eocene (GEE) |
| Lithological Description: |
Thick-bedded, clean, poorly consolidated, fine to medium grained, locally coarse-grained sandstone, with sparse glauconite. Sporadic thin calcite-cemented layers are present in some sections. Thin beds of grey to grey-green, variably silty mudstone also occur. Gamma-ray profiles are typically uniform; sonic log signatures are more variable, especially where cemented layers are present (e.g. 16/7a-9). |
| Definition of Lower Boundary: |
The base of the Skroo Sandstone Member is taken at a downward change from sandstone to grey-green or variegated Horda mudstone, associated with an increase in gamma-ray values and a decrease in velocity. |
| Definition of Upper Boundary: |
The top of the Skroo Sandstone Member is taken at a downward change from grey-green or grey-red Horda mudstone to sandstone, associated with a decrease in gamma-ray values and an increase in velocity. A high gamma spike is present at, or shortly above, the boundary in some sections (e.g. 16/17-8A). |
| Thickness: |
Thicknesses are highly variable, reaching a maximum of about 50 m. |
| Geographical Limits: |
The Skroo Sandstone Member is restricted to the southern part of the South Viking Graben (Quadrant 16 and southernmost Quadrant 9). |
| 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 16/17- 8A: 2118.5-2165.5 m (6951-7105 ft) below KB (Knox and Holloway, 1992). |
| Reference Section |
North Sea well 16/07a- 9: 1925.5-1981.5 m (6319-6501 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
