Weird Extinct Animals 2
This is just a better version of an older iceberg of mine. so uhh yea. This iceberg is categorized by how much we know (Basically how long is the wikipedia page) (also the categories are when the thing first appeared)
Precambrian
Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian
Triassic
Jurassic
Cretaceous
Paleogene
Neogene and further
