The BGS Lexicon of Named Rock Units — Result Details

Dunrobin Bay Group [See Also DRB]

Computer Code: DUNR Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Rhaetian Age (TR) — Toarcian Age (JT)
Lithological Description: Mudstones, sandstones and siltstones of the constituent formations: Orrin Formation Lady's Walk Formation Mains Formation Golspie Formation The Group is almost equivalent to Dunrobin Bay Formation (DRB) onshore, although subdivided differently. Onshore the lower boundary of the formation was placed at the base of the 'Carbonaceous Siltstone and Clay Unit' by Neves & Selley (1975), but at the base of the Dunrobin Pier Conglomerate by Batten et al. (1986). The top of the formation is not exposed onshore. Offshore, the Dunrobin Pier Conglomerate is not recognised and the Orrin Formation is apparently equivalent to the unexposed part of the onshore sequence.
Definition of Lower Boundary: The boundary between the Golspie Formation and the Stotfield Calcrete Formation (Heron Group).
Definition of Upper Boundary: The boundary between the Brora Coal Formation (Fladen Group) and the Orrin Formation.
Thickness: Up to 180 m.
Geographical Limits: Inner Moray Firth, North Sea UK Quadrants 11, 12, 17, 18.
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
none recorded or not applicable
Richards, P C, Lott, G K, Johnson, H, Knox, R W O'B. and Riding, J B. 1993. 3. Jurassic 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