Dinosaurs proper, including the birds that survived them.
Animals routinely filed next to dinosaurs and just as routinely mislabelled as one.
The line that led to us. The sail-backs are in here, not with the dinosaurs.
Jawed and jawless fish that carry the earliest bone in the record.
Everything with an exoskeleton or no skeleton at all. Most of the fossil record by count.
Bonebed › Period index
539 to 485 Ma
Early Cambrian seas were almost entirely soft-bodied; the first widely biomineralised skeletons appear here, which is why Cambrian fossils are the oldest that look like bone at all.
2 entries in this period
