The BGS Lexicon of Named Rock Units — Result Details

Fordyce Limestone Formation

Computer Code: FORD Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Mostly semipelite and pelite with beds of metalimestone, some thick and massive. Minor beds of calc-silicate rock and quartzite.
Definition of Lower Boundary: Base of dark pelites and semipelites overlying paler calcareous, banded phyllitic semipelites and psammites of the Tarnash Phyllite and Limestone Formation. (Base not seen in type section.)
Definition of Upper Boundary: Top of dark pelites and semipelites beneath Durn Hill Quartzite Formation. (Top not seen in type or reference sections.)
Thickness: 700m maximum (based on outcrop width and average dip), >160m on coast at Sandend Bay.
Geographical Limits: Sandend Bay to Mill of Wood Burn, Keith (Sheets 86W, 96W)
Parent Unit: Blair Atholl Subgroup (DABA)
Previous Name(s): Sandend Formation [Obsolete Name And Code: See SNDL, TNPL And FORD] (DASG)
Sandend Group (Upper Part) (-4048)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Burn of Fordyce from Sandend Bay to Newpark, Fordyce. 
Reference(s):
Stephenson, D, et al. 1993. Stratigraphy and correlation of the Dalradian rocks of the East Grampian Project area. British Geological Survey Technical Report WA/93/91. 
Read, H H, 1923. Geology of the country around Banff, Huntly and Turriff, Lower Banffshire and north-west Aberdeenshire. Memoir of the Geological Survey, Scotland Sheets 86 and 96 (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S096 S086