The BGS Lexicon of Named Rock Units — Result Details

Sacquoy Sandstone Member

Computer Code: SQS Preferred Map Code: SqS
Status Code: Full
Age range: Eifelian Age (DI) — Eifelian Age (DI)
Lithological Description: Pebbly sandstone with medium to thick-bedded, predominantly fluvial sandstones in four bodies.
Definition of Lower Boundary: Transgressive sandstone base in flagstone sequence of siltstones.
Definition of Upper Boundary: Base of blackish laminite mudstone at base of lacustrine rhythm number 36 of Astin, 1990.
Thickness: 17m on Sacquoy Head, Rousay Island, Orkney.
Geographical Limits: Orkney Islands.
Parent Unit: Upper Stromness Flagstone Formation (USF)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Cliff section on south side of Sacquoy Head, Rousay Island, Orkney. 
Reference(s):
Astin, T R, 1990. The Devonian lacustrine sediments of Orkney etc; Quarterly Journal of the Geological Society of London, Vol.147, p.141-151. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S119 S121 S121 S122