Morar Group | |
---|---|
Stratigraphic range: 1000–950 Ma | |
Type | Geological group |
Unit of | Wester Ross Supergroup |
Underlies | Glenfinnan Group (tectonic contact) |
Overlies | Lewisian complex |
Thickness | up to 9,000 metres (29,530 ft) |
Lithology | |
Primary | Psammite, semi-pelite, pelite |
Other | Conglomerate, breccia |
Type section | |
Named for | Morar |
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]