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
|