Shrimp fecal pellet in peloid packstone, Jurassic Smackover Formation, image 2.5 mm wide.
Diagenetic and depositional boundary: partially dolomitized large particles in packstone above fine-pellet packstone lacking dolomite. The distribution of dolomite (gray) in the preexisting calcite (stained pink) was controlled by permeability to groundwater.
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