The BGS Lexicon of Named Rock Units — Result Details

Moray Group

Computer Code: MORA Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Paleocene Epoch (GP) — Eocene Epoch (GE)
Lithological Description: The Moray Group is characterized by grey to grey-brown, carbonaceous, pyritic mudstones and siltstones that contrast with the greenish mudstones of the overlying Stronsay Group and the underlying Montrose Group. The group is also characterized by a relatively sharp transition between a 'shelf' succession dominated by sandstone and siltstone, with subordinate lignite, and a 'basinal' succession dominated by mudstone. The shelf succession is assigned to the Dornoch Formation and the basinal succession to the Sele Formation and the Balder Formation.
Definition of Lower Boundary: The base of the Moray Group is marked by a downward change from grey to grey-brown, carbonaceous, pyritic mudstones and siltstones to greenish mudstones of the Montrose Group.
Definition of Upper Boundary: The top of the Moray Group is marked by a downward change from greenish mudstones of the Stronsay Group to grey to grey-brown, carbonaceous pyritic mudstones and siltstones.
Thickness: The Moray Group reaches thicknesses of over 500 m in Outer Moray Firth Basin thinning to less than 30 m in the southern Central North Sea.
Geographical Limits: The Moray Group extends throughout the UK North Sea area (Knox & Holloway 1992; Lott & Knox 1994). Subsequently Knox et al. (1997) extended the geographical range of the Moray Group to include the West of Shetland area.
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Mudge, D C and Copestake, P. 1992a. Revised Lower Palaeogene lithostratigraphy of the Outer Moray Firth, North Sea. Marine and Petroleum Geology 9, 53-69. 
Mudge, D C and Copestake, P. 1992. Lower Palaeogene stratigraphy of the northern North Sea.Marine and Petroleum Geology,9,287-301. 
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. 
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]. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable