Gneiss facies can be expected to find in an area that went through has high grade meta in an orogenic event.
What is Gneiss?
Gneiss is a metamorphic rock that exhibits distinct bands seen in hand samples or on a microscopic scale. Gneiss is usually distinguished from schist by its leaves and foliate structures. Gneiss shows well-developed and poorly developed leaves and divisions.
How does Gneiss form?
It is formed by high-temperature, high-pressure metamorphic processes acting on strata composed of igneous or sedimentary rocks. Gneiss is formed at higher temperatures and pressures than slate.
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