The BGS Lexicon of Named Rock Units — Result Details

Eday Group
Computer Code: EDY Preferred Map Code: Edy
Status Code: Pending Upgrade
Age range: Givetian Age (DV) — Frasnian Age (DR)
Lithological Description: Comprises yellow sandstones with thin fossiliferous flags below and red and unfossiliferous above. Containing one volcanic horizon.
Definition of Lower Boundary: Drawn at the base of the Lower Eday Sandstone Formation where it rests conformably upon the Rousay Member of the Upper Stromness Flagstone Formation.
Definition of Upper Boundary: Not overlain: highest Group in the Orkney Islands.
Thickness: c.1300m
Geographical Limits: Orkney Islands
Parent Unit: Old Red Sandstone Supergroup (ORS)
Previous Name(s): Orkney Sandstone Group [Obsolete Name And Code: Use EDY] (OYS)
Eday Beds (-1520)
Hoy Sandstone (-1521)
Orkney Sandstone Group (-1522)
Eday Sandstones (-2169)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Eday and Eday Sound. 
Reference(s):
Flett J S, 1898. The Old Red Sandstone of the Orkneys. Transactions of the Royal Society of Edinburgh, Vol 39, p.385. 
Mykura W, 1976 British Regional Geology: Orkney and Shetland (HMSO, Edinburgh).] 
Fletcher, T P, 1996. A review of the lithostratigraphy of the Orcadian Old Red Sandstone Supergroup of northern Scotland. British Geological Survey Technical Report WA/96/39R. 
Wilson, G V and others. 1935. The Geology of the Orkneys. Memoir of the Geological Survey of Scotland. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S119 S119 S116 S116 S117 S117 S120 S121 S122 S115
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