The BGS Lexicon of Named Rock Units — Result Details

Millstone Point Sandstone Member

Computer Code: MPS Preferred Map Code: MPS
Status Code: Full
Age range: Chadian Substage (CI) — Chadian Substage (CI)
Lithological Description: Mainly white, cross-bedded sandstone with thin beds of red-brown or grey mudstone (BGS, 1987).
Definition of Lower Boundary: Conformably overlies the Laggantuin Cornstone Member, which comprises sandstone and red-brown silty mudstone in fining-upward cycles with nodules and beds of concretionary limestone. Boundary seen at [NR 9995 4875].
Definition of Upper Boundary: Not seen, but is interpreted to be either faulted or unconformably overlain by grey mudstones with plant remains of the Laggan Cottage Mudstone of the Strathclyde Group.
Thickness: From about 150 to 200m
Geographical Limits: Laggan shoreline of the island of Arran, Scotland.
Parent Unit: Clyde Sandstone Formation (CYD)
Previous Name(s): Millstone Point Sandstones Member (-4801)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Coast near Millstone Point, northeast Arran, Scotland. (Arran Special Sheet). 
Reference(s):
British Geological Survey, 1987. Arran Scotland Special Sheet. Bedrock. 1:50 000 Series (Southampton: Ordnance Survey for the British Geological Survey.) 
Paterson, I B, and Hall, I H S. 1986. Stratigraphy of the Upper Devonian and Lower Carboniferous in the Midland Valley of Scotland. Report of the British Geological Survey, 18/3. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S021 S338 S013