The BGS Lexicon of Named Rock Units — Result Details

Carey Silt Member

Computer Code: CYSI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Holocene Epoch (QH)
Lithological Description: Very fine- to coarse-grained sand, silt and clay, grey and brownish grey, well laminated to thin bedded, some pebbles up to 4cm, finely micaceous, rooty near top below sub-Carse Peat (Flanders Moss Peat Formation); depending on location within the palaeo-estuary, the dominant material varies from sand to clay. The deposit forms a series of raised beaches/terraces related to transgressive and regressive cycles of sea-level change.
Definition of Lower Boundary: Unconformable and transgressive base on older units including the Tay-Earn Gravels and Culfargie Sand members of the Forth Clay Formation and the Errol Clay Formation.
Definition of Upper Boundary: Overlain unconformably by the sub-Carse Peat (Flanders Moss Peat Formation) and trangressive estuarine clay, silt and sand of the Carse of Gowrie Clay Member.
Thickness: Up to 8m
Geographical Limits: River Earn from Bridge of Earn and the Tay east of Perth eastwards to the Tay bridges at Dundee adjacent to the Tay/Earn estuary.
Parent Unit: Carse Clay Formation (CARCL)
Previous Name(s): Carey Beds [Obsolete Name and Code: Use CYSI] (-1471)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Powgave B Borehole, BGS Ref NO22NE/31, from 16.5m to 10.73m depth,Tay estuary. 
Reference Section  Culfargie Borehole, BGS Ref NO11NE/2, from 7.8m to 11.2m depth, lower River Earn. 
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