The BGS Lexicon of Named Rock Units — Result Details

Allt A'Mhuilinn Mudstone Formation

Computer Code: AMMU Preferred Map Code: AMMU
Status Code: Pending Upgrade
Age range: Pridoli Epoch (SO) — Early Devonian Epoch (DL)
Lithological Description: Mainly mudstone and laminated siltstone, with quartzite-dominated conglomerate intercalations
Definition of Lower Boundary: An unconformity with the Dalradian Supergroup below.
Definition of Upper Boundary: The base of the predominantly volcanic rocks belonging to the Ben Nevis Volcanic Formation.
Thickness: About 15m thickness exposed.
Geographical Limits: The Ben Nevis area of Scotland.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Stream section in Allt a' Mhuilinn on the north side of Ben Nevis. McGarvie, 1999. 
McGarvie, D. W. 1999. Ben Nevis and Allt a' Mhuilinn. In: Caledonian igneous rocks of Great Britain. (Geological Conservation Review Series No. 17). Stephenson, D, and six others (editors). (Peterborough: Joint Nature Conservation Committee). 
Burt, R M. 1994. The geology of Ben Nevis, south-west Highlands, Scotland. Unpublished PhD thesis, University of St Andrews. 
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: