Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
greywacke .
Etymologies
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Examples
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In the north-east part of the county there is a large development of slate with interbedded greywackes and pebbly grits, which occupies the coast section between Macduff and Troup Head except a small part at Gamrie.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Various
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The Silurian belt stretching eastwards from the mouth of Loch Ryan to the Merrick range is composed of grits, greywackes and shales with thin leaves of black shales, containing graptolites of Upper Llandeilo age which are repeated by folding and cover
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" Various
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Several bands of conglomerate, separated by greywackes and arenites, are present on the property and exhibit impressive strike continuity.
Reuters: Top News 2011
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It is underlain by conglomerates and greywackes of the Archean Timiskaming group sediments and intruded by later syenite.
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Mineralization in this new Fougala 1 zone is associated with a northerly-trending, pyrite-mineralized and quartz-veined felsic intrusion and host greywackes.
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Mineralization in this new Fougala 1 zone is associated with a northerly-trending, pyrite-mineralized and quartz-veined felsic intrusion and host greywackes.
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In the hinge area, the intervening greywackes are often well stockworked and mineralized due to brecciation by the near vertical shears.
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The fact that the arenites/greywackes do locally carry gold, outside the historic slate belts, led Orex to complete a more thorough sampling of drill holes.
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Mineralization occurs in high grade shoots within quartz-sulphide bearing argillites, as well as both disseminated lower grade and vein-stockwork higher grade gold in intervening greywackes.
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The disseminated gold mineralization comprises multiple subvertical, tabular subzones hosted in silicified greywackes of the Pontiac Group south of the fault contact.
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