Shrimp fecal pellet in pellet grainstone stained with Alizarin red S. Light curved lines within pellet are channels formed by hairs inside the shrimp's gut, now filled with calcite cement. Patterns of channels in cross section are readily identified, and can be used to ID the species responsible. Smackover Formation, shallow-marine shoal or back-barrier lagoon, 1 mm wide.
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