The BGS Lexicon of Named Rock Units — Result Details

Arbikie Diamicton Member

Computer Code: ARBI Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Diamict of red-brown silty, clayey, stoney sand with distictive colour-mottled patches of sand that are intensely weathered lithic clasts that appear dark green, yellow, white, orange in colour. Also partly weathered lithic clasts and unweathered clasts that are matrix-supported in the sand matrix. Unweathered clasts are angular to rounded and lithologies include schist, quartz, white coarse-grained sandstone, red medium-grained sandstone, mafic rock, red-brown sandstone and purple sandstone.
Definition of Lower Boundary: Overlies sand, reddish-brown, pebbly and compact or unconformably overlies bedrock.
Definition of Upper Boundary: Overlain by diamict of the Mill of Forest Till without the distinctive colour-mottled weathered clasts, or unconformably overlain by recent deposits of alluvium or soil.
Thickness: 0.32m to 1.3m
Geographical Limits: Valley of the Gighty Burn, lying north of Arbikie NO 6610 5085 and south of Mountboy NO 6650 5300.
Parent Unit: Mill Of Forest Till Formation (MFT)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Exposure in bank of excavated lake in Gighty Burn, adjacent to sluice in the extreme western end of lake, Arbikie Moor, 1100m northnorthwest of Cotton of Arbikie. 
Partial Type Section  Exposure in southern bank of excavated pond in Gighty Burn, 600m west of Deil's Knowe. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S057