The BGS Lexicon of Named Rock Units — Result Details

Marchfield Moraine Member

Computer Code: MMO Preferred Map Code: notEntered
Status Code: Full
Age range: Devensian Stage (QD) — Devensian Stage (QD)
Lithological Description: Interstratified sequence dominated by Sand and Gravel. Subsidiary lithologies: Reddish brown glacial Diamicton(till), Silt and Clay. Lithologically very heterogeneous. Gravel and diamicton dominate at the type section; fine-to medium-grained sand and silt dominate in many surface exposures. These show extensive small-scale normal faulting and some low-angle glacitectonic thrusting.
Definition of Lower Boundary: Not exposed, but probably a gradational contact on till of the Gretna Till Formation.
Definition of Upper Boundary: Normally the ground surface; locally overlain by Holocene peat in hollows in the moraine surface.
Thickness: At least 12m thick at type section; at least 7.4 to 11.3m proved in adjacent boreholes.
Geographical Limits: Extends from Cargenbridge [NX 955 745], northnortheastwards to the vicinity of "The Grove" [NX 986 796] Dumfries, Dumfriesshire.
Parent Unit: Kerr Moraine Formation (KEMO)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Exposed section on new housing estate (Record CA 1325). 
Partial Type Section  Dumfries By-Pass site investigation BGS Reg No. SE 13972, borehole BR31A. 
Reference(s):
British Geological Survey. 2005. Solway West. Scotland Special sheet. Superficial Deposits and Simplified Bedrock. 1: 50 000 Geology Series. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S010 S009