| Computer Code: |
TBPS |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Hoxnian Stage (QX)
— Ipswichian Stage (QI) |
| Lithological Description: |
Extremely compact, silty sandy gravelly diamicton derived from the Thornsgill Till Formation containing clasts mainly of slate. "Borrowdale Volcanic Group" lithologies and Threlkeld microgranite. Dark grey at base becoming increasingly weathered upwards to yellowish brown with olive brown, orange and white mottling where it had been cryoturbated. Most clasts are decomposed towards top and are commonly bleached. It is the deeply weathered zone of the unit that constitutes the Troutbeck Palaeosol. |
| Definition of Lower Boundary: |
A gradational boundary with relatively unweathered dark grey diamicton or decomposed slate bedrock. |
| Definition of Upper Boundary: |
Generally a sharp, planar, or gradational glacitectonic boundary with overlying greyish brown stony clay diamicton (Threlkeld Till Formation). |
| Thickness: |
To 14m |
| Geographical Limits: |
Vale of Threlkeld, Cumbria. |
| Parent Unit: |
Britannia Catchments Group (BCAT)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
River cliff sections in banks of the Mosedale Beck, 3km south of Wallthwaite, Cumbria. Boardman, 1981, 1991, 1994, 2001. |
| Type Section |
River cliff sections in banks of the Thornsgill Beck, 1km south of Troutbeck Head, Cumbria, Boardman, 1981, 1991, 1994, 2001. |
| Reference(s): |
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. |
| Boardman, J, Lowe, J J, Holyoak, D T, and Wilson, P. 1981. Northeastern Lake District: The valleys of Mosedale and Thornsgill. 7-39 in Field Guide to Eastern Cumbria. J Boardman (editor). Quaternary Research Association, London, 128pp. |
| Boardman, J. 2002. Thornsgill and Mosedale, 46-51 in Quaternary of Northern England. Geological Conservation Review Series, No.25. Huddart, D, and Glasser, N F (editors). (Peterborough: Joint Nature Conservation Committee.) 745pp. |
| Boardman, J. 1994. Mosedale. 165-172 in The Quaternary of Cumbria: Field Guide. Boardman J, and Walden, J (editors). (Quaternary Research Association, Oxford.) |
| Boardman, J. 1991. Glacial deposits in the English Lake District. 231-260 in Glacial deposits in Great Britain and Ireland. Ehlers, J, Gibbard, P L, and Rose, J (editors). (Rotterdam:Balkema.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
