The BGS Lexicon of Named Rock Units — Result Details

Dundee Flagstone Formation

Computer Code: DEF Preferred Map Code: DEF
Status Code: Full
Age range: Early Devonian Epoch (DL) — Early Devonian Epoch (DL)
Lithological Description: Medium- to coarse-grained, cross-bedded sandstones and substantial, distinctive, flaggy sandstones interbedded with minor siltstones and mudstones, interdigitated with the Ochil Volcanic Formation.
Definition of Lower Boundary: The top of the andesitic lava flows at Tealing House and Newton, near Dundee, the base of which is not generally exposed because it lies at the core of the Sidlaw Anticline.
Definition of Upper Boundary: The top of the highest bed of flaggy sandstone and siltstone which is characteristic of the Dundee Flagstone Formation, and below the Scone Sandstone Formation.
Thickness: Up to 1800 m thick.
Geographical Limits: Dundee-Inverkeilor area on Sheets 48E, 49, 57E (uncertain) and 57W.
Parent Unit: Arbuthnott-Garvock Group (ATGK)
Previous Name(s): Dundee Formation (-1495)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Upper part: stream section in Murroes Burn, south of Hole of Murroes, near Dundee. Armstrong et al., 1985 
Partial Type Section  Basal part: Monickie Burn section, north-east of Dundee. Armstrong et al., 1985. 
Reference(s):
Armstrong, M, Paterson, I B and Browne, M A E, 1985. Geology of the Perth and Dundee district. Memoir of the British Geological Survey, Sheets 48W, 48E and 49 (Scotland). 108pp. 
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. 
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 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S048 S049 S057 S057