| Computer Code: |
YDTI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Generally dark grey to greyish brown, extremely compact, stony sandy silty clay diamicton with clasts dominated by, or exclusively, local Carboniferous lithologies (limestone, sandstone, granule-conglomerate and mudstone). Mostly mudstone and limestone at Partial Type Section. Some clasts of wacke sandstone and siltstone from the Howgill Fells occur in tills in upper Wensleydale. |
| Definition of Lower Boundary: |
Generally a sharp uneven contact on bedrock, but locally a complex gradational glaciotectonic contact with fractured or decomposed bedrock. |
| Definition of Upper Boundary: |
Generally the ground surface or overlain unconformably by glaciofluvial sand and gravel or younger Superficial deposits. |
| Thickness: |
Generally less than 10m |
| Geographical Limits: |
The Yorkshire Dales south of the Stainmore Gap and north of the Devensian glacial limit. |
| Parent Unit: |
North Pennine Glacigenic Subgroup (NPEG)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
River cliff section in a drumlin on the northern bank of the Widdale Beck at its confluence with the Snaizeholme Beck 4km SW of Hawes Rose (1991) |
| Type Area |
The Yorkshire Dales south of the Stainmore Gap (between Appleby-in-Westmoreland and Barnard Castle) and north of the Devensian glacial limit. Mitchell (1991): Howard and Macklin (1998) |
| Reference(s): |
| Howard, A J. and Macklin, M G. (eds.) 1998.The Quaternary of the Eastern Yorkshire Dales: Field Guide. Quaternary Research Association,London. |
| Rose,J.1991.Drumlin sediments,Widdale Side.In Mitchell,W.A.(ed.) Western Pennines:Field Guide.Quaternary Research Association,London. |
| Mitchell,W.A.(ed.) 1991.Western Pennines:Field Guide.Quaternary Research Association,London. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
