The BGS Lexicon of Named Rock Units — Result Details
Tay-Earn Gravels Member
Computer Code: | TEGR | Preferred Map Code: | notEntered |
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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 [Obsolete Name and Code: Use TEGR]
(-2480)
Friarton Gravel [Obsolete Name and Code: Use TEGR] (-1224) |
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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 |