Single-celled foraminiferan (arrow; shelled amoeba) in shelter void (small light area in lower center) within microcrystalline microbial coating (brown) on rugose coral (upper right). Growth of foram in this void indicates it was connected in the third dimension to open sea water at the time. Coral-microbial mound, thin-section photomicrograph, Mississippian, North Alabama.
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