The BGS Lexicon of Named Rock Units — Result Details

Gourdon Sandstone Formation

Computer Code: GNF Preferred Map Code: GOU
Status Code: Full
Age range: Silurian Period (S) — Early Devonian Epoch (DL)
Lithological Description: A dull red, coarse-grained, pebbly, angular, lithic sandstone with clasts predominantly of fragments of volcanic rocks, and conglomerate.
Definition of Lower Boundary: Not exposed, but stratigraphically above the Tremuda Bay Volcanic Formation.
Definition of Upper Boundary: At the base of the lowest conglomerate bed within the Whitehouse Conglomerate Formation or at the base of the Crawton Volcanic Formation where the Whitehouse Conglomerate Formation is absent.
Thickness: Up to 300 m thick.
Geographical Limits: Gourdon to Inverbervie and Whistleberry (NO 860 753).
Parent Unit: Dunnottar-Crawton Group (DRCR)
Previous Name(s): Gourdon Formation (-1568)
Castle Hill Formation [Obsolete Name And Code: See GNF] (CAH)
Gourdon Harbour Sandstone Member [Obsolete Name And Code: See GNF] (GHS)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Coastal section at Gourdon. 
Reference(s):
Armstrong, M and Paterson, I B, 1970. The Lower Old Red Sandstone of the Strathmore Region. Report of the Institute of Geological Sciences No.70/12 
Carroll, S, 1994. Geology of the Inverbervie and Catterline district, 1:10 000 sheets NO87NW, NO87NE and NO87SW. British Geological Survey, Technical Report, WA/94/20. 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S067