The BGS Lexicon of Named Rock Units — Result Details

Frigg Sandstone Member

Computer Code: FRIS 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 and carbonaceous particles. Sporadic thin calcite-cemented layers are present in most sections, as are thin beds of grey to grey-green, variably silty mudstone. Gamma-ray log profiles are typically 'blocky' (e.g. 10/1-1 A), but are locally serrated (e.g. 3/30a-3).
Definition of Lower Boundary: The Frigg Sandstone Member is underlain by a thin unit of grey-green or variegated Horda mudstone that separates it from the underlying dark grey mudstones of the Balder Formation.
Definition of Upper Boundary: The Frigg Sandstone Member is overlain by grey-green or grey-red Horda Formation mudstone. A distinct high-gamma spike is present at, or shortly above, the boundary in many sections (e.g. 3/30a-3).
Thickness: Thicknesses are highly variable, and exceed 300 m in places.
Geographical Limits: The Frigg Sandstone Member is restricted to Quadrants 10 and 4 and the southeastern part of Quadrant 3, extending eastwards into the Norwegian sector. A narrow ribbon of sandstone is inferred to extend southeastwards into Quadrant 9.
Parent Unit: Horda Formation (HORD)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  North Sea well 10/1-1A: 1876-2083 m (6155-6834 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. 
Deegan, C E and Scull, B J. 1977. A standard lithostratigraphic nomenclature for the Central and Northern North Sea. Report of the Institute of Geological Sciences, 77/25; NPD Bulletin No.1. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable