| Computer Code: |
TSDC |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Red or reddish brown pebbly sandy silty clay containing well dispersed pebbles mainly of limestone and dolostone of the Zechstein Group (formerly Magnesian Limestone), with some Carboniferous lithologies (sandstone, mudstone, limestone, coal), typically overlying thinly laminated silts and clays, or locally overlying sand. Varves in these laminated clays have been tentatively "wriggle-matched" with the late glacial Greenland ice core record, and dated very approximately by thermoluminescence to 18,365 cal ka BP. |
| Definition of Lower Boundary: |
Uneven, conformable, draped contact with underlying dark brown, stony silty sandy clay diamicton of the Blackhall Till Formation (possibly of the Horden Till Formation). |
| Definition of Upper Boundary: |
Unevem, erosional contact with overlying alluvial or estuarine sands, silts and clays. |
| Thickness: |
To 9.1m |
| Geographical Limits: |
Widespread beneath the Teesside Lowlands to an altitude od about 92m OD. |
| Parent Unit: |
North Sea Coast Glacigenic Subgroup (NSG)
|
| Previous Name(s): |
Tees Laminated Clays [Obsolete Name and Code: Use TSDC]
(-3096)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Borehole T9 (not BGS registered) sited west of Seal Sands in the Tees Estuary and figures in Figure 30 of Horton et al, 1999. Horton et al, 1999. |
| Reference(s): |
| Horton, B P, Innes, J B, Plater, A J, Tooley, M J and Wright, M R. 1999. Post-glacial evolution and relative sea level changes in Hartlepool Bay and the Tees estuary. 65-83 in Bridgland, D R, Horton, B P and Innes, J B, The Quaternary of northeast England: Field Guide. [London: Quaternary Reseach Association.] |
| Bell, F G, and Coulthard, J M. 1997. A survey of some geotechnical properties of the Tees Laminated Clay of central Middlesborough, Northeast England. Engineering Geology, Vol. 48, 117-133. |
| Agar, R. 1954. Glacial and post-glacial geology of Middlesborough and the Tees estuary. Proceedings of the Yorkshire Geological Society, Vol. 29, 237-253. |
| Smith, D B and Francis, E A. 1967. Geology of the country between Durham and West Hartlepool. Memoir of the Geological Survey of Great Britain, Sheet 27 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
