The BGS Lexicon of Named Rock Units — Result Details

Strathtay Formation

Computer Code: STAY Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: A wide range of lithologies encompassing pebbles, fine to coarse gravel, cobbles and boulders in a sandy matrix and coarse- to fine-grained sand, silt and clay. Peat and beds rich in organic remains occur in the floodplain deposits.
Definition of Lower Boundary: Unconformably overlies older Quaternary deposits and bedrock.
Definition of Upper Boundary: Normally the land surface.
Thickness: Veneer to several metres
Geographical Limits: Recognized in the Tay catchment area as the alluvial deposits of the Tay and all its tributaries, from highest to lowest order, includes valleys of the Earn, Eden, Almond, Isla, Tummel and Garry.
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): Fluvial Alluvium (-3051)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Tay valley upstream from the tidal limit at Perth to the outlet of Loch Tay at Kenmore. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S047 S048 S048 S049