Ooid

spherical sedimentary grains From Wikipedia, the free encyclopedia

Ooid
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An ooid is a small rounded sedimentary rock. Like sand grains, ooids have a diameter of 2 mm or less. Larger grains formed the same way as ooids are called pisoids. Rock made of ooids is oolite.[1]

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Ooids
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Ooids on the surface of an oolite limestone. Carmel Formation (Middle Jurassic) of southern Utah
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Thin-section of calcitic ooids from an oolite

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