Table of Geological Systems
These names, given by geologists to the various divisions of rocks, as indicated by the fossils entombed in them, are arranged in ‘descending’ order, the more recent formations above, the more ancient below, as newer deposits necessarily lie over older beds.
Calnozoic or Tertiary Group
Pleistocene.
Pliocene.
Miocene.
Eocene.
Mesozoic or Secondary Group
Cretaceous.
Jurassic.
Triassic.
Palaeozoic or Primary Group
Permian.
Carboniferous.
Devonian.
Silurian.
Cambrian.