Fossils in thin section

Brachiopods in thin section

Two unequal valves, roughly 1–10 cm. Articulate shells are calcite, with impunctate, pseudopunctate or punctate walls. Valves often look crenulated or ornamented in section. Spines (common in late Paleozoic productids) are hollow with finely laminated walls and often break off into the sediment.

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All fossil groups Carbonate classification