The BGS Lexicon of Named Rock Units — Result Details

Tay-Earn Gravels Member

Computer Code: TEGR Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Gravel, rounded to sub-angular up to 10cm, and fine- to coarse-grained sand; gravel recorded as composed of vein quartz, quartzite and other metamorphic rocks, Lower Devonian lavas, and dolerite.
Definition of Lower Boundary: Markedly erosive base cut into the Errol Clay Formation and the Culfargie Sand Member of the Forth Clay Formation. This supposedly fluvial unit is usually found in a deep channel cut into pre-existing deposits but is recognized on the flanks too.
Definition of Upper Boundary: Overlain unconformably by the transgressive estuarine sand, silt and clay of the Carey Silt Member (Carse Clay Formation) and also by younger units including the sub-Carse Peat (Flanders Moss Peat Formation) and Carse of Cowrie Clay Member (Carse Clay Formation); also exposed at the surface locally.
Thickness: Veneer on the flanks of channels and up to 25m.
Geographical Limits: River Tay just northwest of Perth, River Earn from Bridge of Earn eastwards to the Tay bridges at Dundee adjacent to the Tay/Earn estuary.
Parent Unit: Forth Clay Formation (FOCL)
Previous Name(s): Earn Gravel (-2480)
Friarton Gravel (-1224)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Almondbridge Borehole, BGS Ref. NO02NE/13, from 1.8m to 8.4m depth, lower Tay Valley. Paterson et al, 1981. 
Reference(s):
Paterson, I B, Armstrong, M and Browne, M A E. 1981. Quaternary estuarine deposits in the Tay-Earn area, Scotland. Report of the Institute of Geological Sciences, No.81/7. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S048 S048 S049