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Three lobed body plan, Cambrian to the devonian
Trilobites

Spiral-shaped with chambered shells, Devonian to Cretaceous
Ammonites

Two shells which are bilaterally symmetrical. Cambrian to present
Brachiopods

extinct, colonial marine organisms, saw-like apperance. Cambrian to Carboniferous (peak Ordovician and Silurian)
Graptolites

Single-celled with calcareous shells. Cambrian to present
Forams (e.g. Nummulites)

Belemnites

Fish scales

Snails (gastropodes)

Plant fossils

Sea Urchins (echinoidea)

Corals (Rugosa-horn corrals)