oolith

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oolith

[′ō·ə‚lith]
(petrology)
A small (0.25-2.0 millimeters), rounded accretionary body in a sedimentary rock; generally formed of calcium carbonate by inorganic precipitation or by replacement; ooliths generally exhibit concentric or radial internal structure.
References in periodicals archive ?
5) were able to demonstrate that the "Gracilis association", recorded in the lower oolitic interval (levels 108 a-c) was in fact a reelaborated entity constituted by fragmented or disarticulated moulds (Fm; Dm), non deformed; maintaining their original shape and volume, and formed by a micritic, non-oolitic (or with few sparse ooliths) infill.
formed by yellow-reddish iron ooid wackestone to packstone, including abundant, thick highly heterometric ferruginous ooliths. Beds show irregular, lenticular bedding underlined by the presence of frequent ferruginous surfaces with local development of hard-ground.
Sandberg (1983, 1985) found that the composition of nonskeletal carbonate precipitates (early marine cements and ooliths) has undergone oscillations during Phanerozoic time: there have been three intervals of aragonite seas (Early Cambrian, Late Carboniferous-Early Jurassic, Oligocene-Recent), and two intervals of calcite seas (Middle Cambrian Early Carboniferous, Middle JurassicEocene) (Stanley 2006).