Now, onto something else. Below is a diagram of the geologic column. Without making any statements about the ages involved (the 'Era' and 'Period' columns can be considered useful labels not date stamps) do you agree that this is what is found, in this order (with sections missing, sometimes inverted, but never mixed up) when examining rocks?
Era |
Period |
Flora/Fauna |
Cenezoic |
Quaternary |
Modern mammals, dominance of human |
Tertiary |
Birds/Placental mammals |
|
Mesezoic |
Cretaceous |
Flowering plants dominate; extinction of large reptiles and ammonites |
Jurrasic |
Reptiles dominate on land/sea and air; first birds |
|
Triassic |
First dinosaurs/turtles/Icthyosaurs/ pleisosaurs; cycads and conifers dominate |
|
Paleozoic |
Permian |
Reptiles radiate |
Carboniferous |
Ferns dominate; sharks and crinoids abundant; amphibians radiate; first reptiles |
|
Devonian |
Age of fishes; first trees; first amphibians |
|
Silurian |
Plants and arthropods invade land;jawless vertebrates |
|
Ordovocian |
Armoured fish; brachiopods and cephalopods dominate |
|
Cambrian |
Appearance of all invertebrate phyla; trilobites dominate |
|
Precambrian |
|