Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
gneiss .
Etymologies
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Examples
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Geologically, the area is made up mainly of intensive granite and metamorphic rocks such as gneisses quartzites and schists of pre-Cambrian age.
Chapter 6 1984
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The Park consists of a lateritic peneplain, with rock outcrops of quartz, schists and gneisses.
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The Southern Metasedimentary Mountains in North Carolina contain rocks that are not as strongly metamorphosed as the gneisses and schists of 66d.
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G.T. Prior, who has described the rocks collected by Scott's expedition, gives the following as belonging to the complex of foundation rocks: gneisses, granites, diorites, banatites, and other eruptive rocks, as well as crystalline limestone, with chondrodite.
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It is, therefore, tolerably certain that the underlying older formation of gneisses, crystalline schists and granites, etc., is of Archæan age, and belongs to the foundation rocks.
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Precambrian metamorphic rocks consisting of gneisses and schists, and sedimentary rocks of the Precambrian Ocoee series are predominant, while younger sedimentary rocks are found in the Appalachian Valley.
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Inland these are replaced by gneisses, gneissic granites, and metamorphosed sediments of the Precambrian Basement Complex that forms part of the ancient massif.
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The Southern Metasedimentary Mountains in Georgia contain rocks that are generally not as strongly metamorphosed as the gneisses and schists of 66d.
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The geology of the area comprises a mixture of gritty sandstones of the Karoo sediments, deep aeolian sands of the Pleistocene Kalahari system and gneisses, gneissic granites and metamorphosed sediments of the Precambrian basement complex.
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These are principally schists, gneisses and quartzite.
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