The stratigraphic column, Cambrian through Quaternary, was deposited in Noah's flood, a world-wide event. Arbitrary time hack (ATH) is the technical term for the Eras, Periods and Epochs of the geological timescale.
Arbitrary Time Hacks
Eras, Periods and Epochs
The Geological Timescale is split into fours Eras. These are broadly obvious from significant transitions between sequences of sedimentary formations. The Precambrian is obviously very different to everything above it.
Matty's Paradigm 