The BGS Lexicon of Named Rock Units — Result Details

A'Mharagach Member

Computer Code: AMHAR Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Triassic Period (T) — Triassic Period (T)
Lithological Description: Alluvial, pedogenesis and floodplain deposits (interpreted as cyclothems, Emeleus, 1997) are recorded in distinct red beds of fining upwards, arenaceous sediments, interbedded with cornstones. Not shown on 50K maps.
Definition of Lower Boundary: Abrupt transition to 'red beds' above the conglomerates of the Shellesder Member.
Definition of Upper Boundary: Top underlies cross-stratified conglomerates of the Sgoarishal Member.
Thickness: 40m
Geographical Limits: Sea of the Hebrides Basin/Isle of Rum.
Parent Unit: Monadh Dubh Sandstone Formation (MODS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Monadh Dubh, northwest Rum. 
Reference(s):
Emeleus, C H, 1997. Geology of Rum and the adjacent islands. Memoir of the British Geological Survey, Sheet 60 (Scotland). 
Steel, R J. 1974. New Red Sandstone piedmont and floodplain sedimentation in the Hebridean province, Scotland. Journal of Sedimentary Petrology, Vol.44, 336-357. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S060