Appin Group

Appin Group
Stratigraphic range: Neoproterozoic
Type Group
Unit of Dalradian Supergroup
Sub-units Lochaber, Ballachulish and Blair Atholl subgroups
Underlies Argyll Group
Overlies Grampian Group
Thickness up to 4km
Lithology
Primary psammite
Other semipelite, quartzite, pelite, schist, limestone, slate
Location
Region Central Highlands
Type section
Named for Appin

The Appin Group is a thick sequence of metamorphosed Neoproterozoic sedimentary rocks that outcrop across the Central Highlands of Scotland, east of the Great Glen. It forms a part of the Dalradian Supergroup.

It is divided into three; from oldest to youngest these are the Lochaber, Ballachulish and Blair Atholl subgroups. In order, the Lochaber Subgroup consists of the Eilde Quartzite, Eilde Schist, Binnein Quartzite, Binnein Schist, Glencoe Quartzite and Leven Schist formations. The Ballachulish Subgroup consists of the Ballachulish Limestone, Ballachulish Slate, Appin Quartzite, and Appin Phyllite & Limestone formations. The Blair Atholl Subgroup consists of the Cuil Bay Slates, Lismore Limestone, Mullach Dubh Phyllites and Islay Limestone formations. This whole succession reflects alternate periods of deepening and filling of the sedimentary basin.[1] [2]

References

  1. ↑ Strachan, R.A., Harris, A.L., Fettes, D.J. & Smith, M. 2002 The Highland and Grampian Terranes. In: Trewin, N.H. (ed) The Geology of Scotland. The Geological Society, London pp 96-99
  2. ↑ http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=APP
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