==========================================================================================
Era Period Epoch Duration Years Before Present
==========================================================================================
Holocene 10 000 yrs
QUATERNARY (Recent)
--------------------------------------------------
Pleistocene 1.5-1.8 m yrs
------------------------------------------------------------- 1.5-1.8 m yrs
Pliocene 3-5 m yrs
CAINOZOIC Neogene ---------------------------------------- 5-7 m yrs
Miocene 19 m yrs
----------------------------------------------------- 26 m yrs
TERTIARY Oligocene 11-12 m yrs
-------------------------------------- 37-38 m yrs
Palaeogene Eocene 16 m yrs
-------------------------------------- 53-54 m yrs
Paleocene 10 m yrs
============================================================================ 64-65 m yrs
/ Maastrichian
Senonian- Campanian 35 m yrs
\ Santonian
\Coniacian
Late ------------
Turonian
Cenomanian
CRETACEOUS ---------------------------------------------------- 100 m yrs
Albian
MESOZOIC Aptian
Barremian
Early Hauterivian 36 m yrs
Valanginian
Berriasian
----------------------------------------------------------------- 136 m yrs
JURASSIC 54-59 m yrs
------------------------------------------------------------- 190-195 m yrs
TRIASSIC 33 m yrs
================================================================================ 225 m yrs
PERMIAN 55 m yrs
----------------------------------------------------------------- 280 m yrs
CARBONIFEROUS 65 m yrs
----------------------------------------------------------------- 345 m yrs
DEVONIAN 50 m yrs
----------------------------------------------------------------- 395 m yrs
PALAEOZOIC SILURIAN 35-45 m yrs
------------------------------------------------------------- 430-440 m yrs
ORDOVICIAN 60-70 m yrs
----------------------------------------------------------------- 500 m yrs
CAMBRIAN 70 m yrs
================================================================================ 570 m yrs
ADELAIDEAN 230-530 m yrs
------------------------------------------------------------ 800-1100 m yrs
UNDIFFERENTIATED 250-550 m yrs
/ PROTEROZOIC ---------------------------------------------------------------- 1350 m yrs
PRE / CARPENTARIAN 450 m yrs
CAMB- ---------------------------------------------------------------- 1800 m yrs
RIAN EARLY 700 m yrs
ERAS \ =============================================================================== 2500 m yrs
\ ARCHAEN - Formation of the Earth's crust 2100 m yrs 4600 m yrs
==========================================================================================
