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Phylum: Bryozoa
- Range: Odovician-Holocene
- Significance: expands and produces reefs in Ordovician and the permain
 lives inside the tiny holes, also dome shaped and Fenestrate.
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Phylum: Brachipoda
- T: Animalia (clam)
- R: Cambrian-Holocene
- S: Large part of Cambrian Fauna, good for biostratigraphy, and has hard parts
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Phylum: Cnidaria
Class: Rugosa
- T: Animalia
- R: Ordovician-Permian
- S: Can be used for biostratigraphy, contributed to reef production
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Phylum: Cnidaria
Class: Tabulata
- T: Animalia
- R: Ordovician-Devonian
- S: Can be used for biostratigraphy, contributed to reef production
- during Silurian-Devonian very big reefs
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Phylum: Mollusca
Class: Cephlopoda
Subclass: Nautiloiden
- T: Animalia
- R: Cambrian-Holocene
- S: good for biostratigraphy in Cambrian-Devonian
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Phylum: Mollusca
Class: Bivalvia
- T: Animalia (Clams)
- R:
- S: not good for biostratigraphy, after Permian extinction became abundant, & has hard parts
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