They lived in the mid-Cretaceous period.
It live on Late Jurassic Period, 154-150Ma.
we currently live in the Quaternary period, the period of humans. If you do not trust this answer, please go to chacha.com/answers We live in the age of modern science thanks Ebony
the critatios period
they lived in the cretaceous period
Cretaceous period,
Cretaceous period
Ordovician Period
It lived in the Jurassic period.
the Jurassic Period
Parasaurolophus lived in the Cretaceous period.
Triceratops lived in the Cretaceous period.
the brachiosaurus lived in the Jurassic period