The BGS Lexicon of Named Rock Units — Result Details

Skroo Sandstone Member

Computer Code: SKRS Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Early Eocene Epoch (GEE) — Early Eocene Epoch (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 16/7a-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