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
Stratotypes:
Type Section  Stream section in Allt a' Mhuilinn on the north side of Ben Nevis. McGarvie, 1999. 
Reference(s):
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 Unpublished PhD thesis, University of St Andrews.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:
S053