The BGS Lexicon of Named Rock Units — Result Details

Ruabon Till Member

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 (-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. 2005. North-east Wales. In Lewis, C A and Richards A E (eds). The glaciations of Wales and adjacent areas. Logaston Press. 
Thomas, G S P. 1985. The Late Devensian glaciation along the border of northeast Wales. Geological Journal, 20, 319-340. 
Bowen, D Q, 1999. Wales. Chapter 7 in Bowen, D Q (Editor), A revised correlation of Quaternary deposits in the British Isles. 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