Morar Group

Morar Group
Stratigraphic range: 1000–950 Ma
Folded Morar Schist of the Morar Group, in Glen Meadail near Inverie in Knoydart
TypeGeological group
Unit ofWester Ross Supergroup
UnderliesGlenfinnan Group (tectonic contact)
OverliesLewisian complex
Thicknessup to 9,000 metres (29,530 ft)
Lithology
PrimaryPsammite, semi-pelite, pelite
OtherConglomerate, breccia
Type section
Named forMorar

The Morar Group is a sequence of Tonian (lower Neoproterozoic) sedimentary rocks that have been subjected to a series of tectonic and metamorphic events since their deposition. Originally interpreted to be lowest (oldest) part of a "Moine Supergroup", this sequence now forms part of the Wester Ross Supergroup.[1] They lie unconformably on Archean to Paleoproterozoic basement of the Lewisian complex. The contact with the overlying Glenfinnan Group of the Loch Ness Supergroup is everywhere a tectonic one, formed by the Sgurr Beag Thrust or related structures.[2]

  1. ^ Krabbendam, M.; Strachan, R.; Prave, T. (2022). "A new stratigraphic framework for the early Neoproterozoic successions of Scotland". Journal of the Geological Society. 179. doi:10.1144/jgs2021-054. hdl:10023/24155.
  2. ^ British Geological Survey. "Morar Group". BGS Lexicon of Named Rock Units. Retrieved 12 June 2024.