The Lewisian complex or Lewisian gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean terrane and the …

Dec 29, 2025 · In the region where they occur, Lewisian rocks form the basement, or lowermost, rocks; they form all of the Outer Hebrides, as well as the islands of Coll and Tiree, and are …

The Lewisian, Torridonian and Moine of Scotland are basement (Lewisian) and cover rocks formed on the eastern margin of Laurentia between about 3000 Ma and 900 Ma (i.e. Archaean …

The 'Lewisian' refers to a geological complex in Scotland composed of amphibolite- to granulite-facies Mesoarchean-Neoarchean TTG gneisses and metamorphosed ultramafic-mafic rocks, …

The meaning of LEWISIAN is of, relating to, or constituting a division of the Precambrian.

Sep 21, 2025 · The term “Lewisian” is derived from the Isle of Lewis, a part of the Outer Hebrides in Scotland, where these ancient rocks are predominantly found. The suffix “-ian” is used to …

The first 2500 million years of the geological history of Britain are stored in the gneisses of the Lewisian Complex of Northwest Scotland. As I write this, it is exactly 200 years since the …

Apr 21, 2022 · Much of the extensive literature on the Lewisian is highly specialised and not easily accessible to the general reader; this book is an attempt to distil the most important results of …

Part 1 of The Lewisian presents a thorough, yet succinct, history of study of the Lewisian rocks. Chapter 2 introduces the read-er to the earliest geological walkabouts on the rocks.

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