TABLE OF GEOLOGICAL SYSTEMS
Reading edition
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.