TABLE 1/1. STRATIFIED ROCKS.

KAINOZOIC OR TERTIARY: Pleistocene and Recent.  Pliocene.
  Miocene.
  Oligocene.
  Eocene.

MESOZOIC OR SECONDARY: Cretaceous.  Jurassic.
  Triassic.

PALAEOZOIC OR PRIMARY: Permian.  Carboniferous.
  Devonian or old Red Sandstone.
  Silurian.
  Ordovician.
  Cambrian.

PRECAMBRIAN OR ARCHAEAN.