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The collective term for particles (grains) which form the framework in mechanically deposited limestones. In the limestone classification of Folk, allochems are often found together with a carbonate mud matrix (micrite) and may subsequently have pore spaces filled by sparry calcite cement (sparite). Common allochems include skeletal fragments (bioclasts), ooids, peloids, and intraclasts.

Subjects: Earth Sciences and Geography.

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