Pellets (petrology)

Pellets are small spherical to ovoid or rod-shaped grains that are common component of many limestones.

Pellets typically lack any internal structure and are remarkably uniform in size and shape in any single limestone sample.

Also, pellets composed of either glauconite or phosphorite are common in marine sedimentary rocks.

In addition, pellets, quite unlike intraclasts, are characterized by a remarkable uniformity of shape, extremely good sorting, and small size.

Pellets, in the strict sense, are fecal products of invertebrate organisms.