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Lewisian complex
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
. These rocks are of
Archaean
and
Paleoproterozoic
age, ranging from 3.0–1.7
Ga
. They form the
basement
on which the
Torridonian
and
Moine Supergroup
sediments were deposited. The Lewisian consists mainly of
granitic
gneisses
with a minor amount of
supracrustal rocks
. Rocks of the Lewisian complex were caught up in the
Caledonian orogeny
, appearing in the hanging walls of many of the
thrust faults
formed during the late stages of this tectonic event.
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