The Loch Ness Supergroup is one of the subdivisions of the Neoproterozoic sequence of sedimentary rocks (or their metamorphic equivalents) in the Scottish Highlands.

[4] Slices of Lewisian-type gneisses are found above the Sgurr Beag Thrust and are interpreted to represent pieces of basement to the group, with a highly sheared unconformable contact, incorporated during the Caledonian orogeny.

The original stratigraphic thickness of the group is difficult to estimate due to the high level of strain that it experienced but is likely to be several kilometres.

The Glen Banchor sequence is believed to be between 1 and 1.5 km thick and unconformably overlain by rocks of the Grampian and Appin groups, though the boundary may be tectonic in nature.

The evidence of bimodal magmatism affecting the Loch Eil Group combined with the MORB chemistry of the mafic intrusions is consistent with a period of rifting.

Detrital zircon ages show that some of the sediment was coming from a Renlandian source, suggesting that the sequence was deposited in its hinterland, possibly as part of a foreland basin.