I learned it today – earth’s geological timeline

13.8 Billion years ago – Big Bang space and time becoming different dimensions,

13.76 Billion years ago- Cosmic dark age

13.4 Billion years as go – first stars 

13.2 Billion years ago- oldest known galaxy GN-z11

13.1 Billion years ago – oldest gamma ray burst GRB 090423

13.5 -12.9 Billion years ago – Milky way galaxy formed

10.01- 9.1 Billion years ago – Andromeda galaxy 

5 Billion years ago- collision of both 

4.571 Billion years ago – our solar system 

4.543 Billion years ago – our earth

Earth’s geologic time scale

Ga=giga annum= billion years =10^9

Ma=mega annum= million years=10^6

Ka=kilo annum= thousand years=10^3=millenium

(Extras-

 TA= tera annum=trillion years =10^12

Pa= peta annum= quadrillion years= 10^15

EA= exa annum= quintillion years = 10^18

SUPEREON > EONS > ERAS > PERIODS > EPOCHS > AGES

PRE CAMBRIAN SUPEREON -4.5 ga- .5 ga

Hadean eon(4.5- 4ga ) time before fossil record of life on planet earth

Archean eon (4- 2.5 ga)

ERAS

  • Eoarchean era (4-3.6 ga)
  • Paleoarchean era ( 3.6- 3.2 ga)
  • Mesoarchean era (3.2- 2.8 ga)
  • Neoarch era (2.8- 2.5 ga)

2 – Proterozoic eon (2.5- 0.6 ga)

ERAS

Paleoproterozoic era(2.5- 1.6 ga)

  •            PERIODS
  • Siderian period(2.5- 2.3 ga)
  • Rhyacin period(2.3- 2.03 ga)
  • Orosirian period(2.3-1.8 ga)
  • Statherian period(1.8- 1.6 ga)

Mesoproterozoic era (1.6- 1 ga)

  •           PERIODS
  • Calymmian period(1.6-1.4 ga)
  • Ectasian period (1.4- 1.2 ga)
  • Stenian period (1.2- 1 ga)

Neoproterozoic era( 1- 0.6 ga)

  •           PERIODS
  • Tonian period (1-0.72 ga)
  • Cryogenian period (0.72- 0.635 ga)
  • Ediacaran period (0.635- 0.541 ga)

POST CAMBRIAN EXPLOSION (0.6 ga – current)

541 – Phanerozoic eon (0.6- current)

ERAS

Paleozoic era(0.6- 0.25 ga)

– PERIODS

  •  Cambrian period
  • Ordovician period
  • Silurian period
  • Devonian period
  • Carboniferous period
  • Permian period

Mesozoic era(0.25- 0.07 ga)

  •  – PERIODS
  • Triassic period
  • Jurassic period
  • Cretaceous period

Cenozoic era(0.07ga – current )

 – PERIODS

    Paleogene period – (66 Mya- 23.03 Mya)

                         EPOCHS

  •                          Pal Eocene epoch
  •                          Eocene epoch
  •                          Oligocene epoch

  Neogene period –

                         -EPOCHS

  •                          Miocene epoch
  •                           Pliocene epoch       

 Quaternary period (2.588 Mya – present)

                             – EPOCHS

                              Pleistocene epoch( 2580000- 11,700 years ago)

  • Early Pleistocene (2.58-9.8 ma) 
  • Homo genus originated and spread in Africa
  • Spread outside Africa in later Pleistocene 
  • AGES
  • Gelasian age(2.58-1.086 ma)
  • Calabrian age(1.8 ma- 781000 ya)- last magnetic pole reversal
  • Chi banian age ( middle Pleistocene)-0.77 ma-0.126ma)
  •  Tarantian age – not officially accepted yet(129000-11700)ya

                                 Holocene epoch ( 9700 BC

AGES

  • Greenlandian (9700 BC)- end of younger dryas 
  • Northgrippian (6636 BC) – 8.2 kilo years event – sudden decrease in global temperature
  • Meghalayan (2250 bc- present )

Krem mawmluh cave in meghalaya( 4,200 years BP/ 2250 BC) proposal for new epoch – Anthropocene with 1950 AD  as starting year – not yet officially accepted by ICS( International Commission on  Stratigraphy )and IUGS ( International Union of Geological Sciences)

       Today- 2021 AD- current hierarchy-

Meghalaya age 

Holocene epoch

Quaternary period

Cenozoic era

Phanerozoic eon

Post Cambrian SUPEREON/ explosion 

2 comments

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