-
444 BCE
Ordovician
444 million years ago were sea creatures
filter feeding animals
colony builders -
375 BCE
Devonian
375 million years ago most diverse/abundant animals
appeared in cambrian explosion
spiky armoured and different faced -
251 BCE
Permian
251 million years ago Known has "The great dying"
"perfect storm" wiped them out near siberia
Worst extinction ever seen -
200 BCE
Triassic
200 million years ago were originally mistaken for sponges but once a fossil was found, they were able to identify as Triassic -
66 BCE
Cretacous
66 million years ago
The delicate leafy sutures decorating this shell represent some advanced engineering, providing the fortification the squid-like ammonite required to withstand the pressure of deep dives in pursuit of its prey. Dinosaurs may have ruled the land during the Cretaceous period but the oceans belonged to the ammonites.