Lewisian complex - Wikipedia
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 North Atlantic Craton. These rocks are of Archaean and Paleoproterozoic age, ranging from 3.0–1.7 billion years (Ga).
Lewisian Complex | Gneiss, Granite & Schist | Britannica
Lewisian Complex, major division of Precambrian rocks in northwestern Scotland (the Precambrian began about 4.6 billion years ago and ended 542 million years ago). In the region where they occur, Lewisian rocks form the basement, or lowermost, rocks; they form all of the Outer Hebrides, as well as
Travelling 2.7 billion years back in time on the search for the UK's ...
Our scientists have been looking for a rock that formed so long ago it was on Earth before complex life lived on land. Called Lewisian gneiss, it’s the oldest rock in the UK. It’s found in the northwest extremity of the Scottish mainland and the Western Isles.
Scourie Bay and Laxford – Scottish Geology Trust
Located in the North-West Highlands UNESCO Global Geopark, Scourie is known worldwide for its exceptional exposures of ancient metamorphic rock – the Lewisian gneiss – and as the home of the Scourie dykes, which are massive vertical black magmatic intrusions.
Gneiss - Wikipedia
The Lewisian gneiss is found throughout the Outer Hebrides of Scotland, on the Scottish mainland west of the Moine Thrust, and on the islands of Coll and Tiree. [20] These rocks are largely igneous in origin, mixed with metamorphosed marble, quartzite and mica schist with later intrusions of basaltic dikes and granite magma. [21]
Geology of the Isle of Skye - Wikipedia
The oldest rocks found on Skye are gneisses of the Lewisian complex that were formed about 2,800 million years ago during the Archaean. [1] These gneisses outcrop on the southeastern coast of the Sleat peninsula and were originally granitic igneous rocks.
Hebrides - Scottish Geology Trust
Most of the Outer Hebrides is comprised of Lewisian gneiss, the name being derived from the isle of Lewis. The Lewisian gneisses represent the oldest rocks in Britain and date back to around 3000 million years ago.
Gneiss | Classification, Composition, Characteristics, Formation, …
Apr 23, 2023 · Most of the Outer Hebrides of Scotland have a bedrock formed from Lewisian gneiss. In addition to the Outer Hebrides, they form basement deposits on the Scottish mainland west of the Moine Thrust and on the islands of Coll and Tiree.
Chapter 3 Lewisian of the Scottish mainland - British Geological …
The authors recognized that the Lewisian is made up of a wide range of different gneisses derived from igneous rocks of various ages, together with minor metasedimentary rocks, all of which have been subjected to strong deformation and high-grade metamorphism.
Learn | Calanais Standing Stones
The bedrock of the Isle of Lewis is Lewisian gneiss, the complex crystalline rock from which the Calanais Standing Stones are formed. Ranging between 3.0 and 1.7 billion years old, this rock is the oldest in western Europe and among the oldest in the world.