Peloids are grains composed of microcrystalline to cryptocrystalline calcite or aragonite mud; if we are confident that such grains should be interpreted to have a fecal origin, then they are called pellets. Peloids also form by micritization of grains. Peloids are generally less than 200 to 300 microns (0.2 to 0.3 mm) in diameter, internally structureless, and ovoid to oblong in shape. With so few distinctive features it is inherently difficult to discriminate such grains from small intraclasts.

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