Help request! Biostratigraphic reality check needed for geologic time educational tool.
- biostratigraphy
- cambrian
- ordovician
- silurian
- devonian
- carboniferous
- mississippian
- pennsylvanian
- permian
- triassic
- jurassic
- cretaceous
- paleogene
- neogene
- paleocene
- eocene
- oligocene
- miocene
- pliocene
- pleistocene
- mollusca
- brachiopoda
- bryozoa
- cnidaria
- arthropoda
- trilobita
- ostracoda
- invertebrates
- vertebrates
- plants
- microfossils
- foraminifera
- chitinozoa
- radiolaria
- diatoms
- algae
- echinodermata
- crinoidea
- echinoid
- sharks
- chondrichthyes
- fish
- tetrapoda
- ammonoidea
- cephalopoda
- ichnology
- gastropoda
- pelecypoda
- crustacea
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