STEP 1 - An organism dies and sinks into mud., STEP 5 - Minerals in groundwater replace decaying bone with rock., STEP 3 - Layers of sediment pile up on top of the bones., STEP 2 - The organism's soft, fleshy parts are eaten or decompose, leaving only bone., STEP 4 - The sediment turns to rock making a mold, an impression, around the bones.,

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