| Computer Code: |
RBNTI |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
Grey or brown, calcareous, sandy, stony diamicton containing significant proportion of locally-derived Carboniferous rocks (mainly limestone, sandstone and mudstone). |
| Definition of Lower Boundary: |
Generally unconformable on bedrock |
| Definition of Upper Boundary: |
The ground surface or locally unconformably overlain by stiff, red, clay-rich diamicton (Dee Member of Bowen 1999) of the Stockport Glacigenic Formation. |
| Thickness: |
Highly variable, locally in excess of 5m. |
| Geographical Limits: |
Eastern Clwydian Hills and extending eastwards at depth to Mold and Wrexham. |
| Parent Unit: |
Plynlimon Glacigenic Formation (PLYNT)
|
| Previous Name(s): |
Ruabon Till [Obsolete Name and Code: Use RBNTI]
(-3633)
|
| Alternative Name(s): |
Ruabon Member
|
| Stratotypes: |
| Type Area |
Till overlying Silurian (Wenlock) and Carboniferous bedrock west of the River Alyn Bowen, 1999 |
| Reference(s): |
| Thomas, G S P. 1985. The Late Devensian glaciation along the border of northeast Wales. Geological Journal, 20, 319-340. |
| Thomas, G S P. 2005. North-east Wales. In Lewis, C A and Richards A E (eds). The glaciations of Wales and adjacent areas. Logaston Press. |
| Bowen, D Q. 1999. Wales. Chapter 7 in A revised correlation of Quaternary deposits in the British Isles. Bowen, D Q (editor). Geological Society of London Special Report, No. 23. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
