Fossils in thin section

Bryozoans in thin section

Colonial, calcareous animals that encrust, branch or form lacy (fenestrate) sheets. Identified by wall structure and the arrangement of zooecia (the small chambers); laminated walls are distinctive in thin section. They resemble corals but have much smaller openings, typically under 1 mm. Mostly calcite, some aragonite.

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All fossil groups Carbonate classification