Precambrian Eon (4.5 GA - 542 ma)

Question 1

Precambrian Eon is subdivided into three (3) parts, namely;

Answer 1

Hadean* (around 4500)
Archean (3.85 -2.5)
Proterozoic (2.5 - 542 ma)

Question 2

Hadean’s interval age

Answer 2

4.5 -3.85 Billion years

Question 3

Archean’s interval age

Answer 3

3.86 - 2.5 Billion years

Question 4

Proterozoic’s interval age

Answer 4

2.5 - 542 million years

Question 5

Archean is divided into four eras (4) parts namely as;

Answer 5

EoArchean (3.85 - 3.6)
PaleoArchean (3.6 - 3.2)
MesoArchean ( 3.2 - 2.8)
NeoArchean (2.8 - 2.5)

Question 6

Formation of FIRST BIF ( Algoma Type Deposit )

Answer 6

EoArchean (3.85 - 3.6)

Question 7

Greenland Stromatolite: Chemical Evidence of life in England

Answer 7

EoArchean (3.85 - 3.6)

Question 8

Formation of FIRST THEORIZED supercontinent ; Vaalbara which was completed at around 3.1 Billion years ago.

Answer 8

EoArchean ( Around 3.6)

Question 9

Age of Archean-Stromatolite found in Hamelin Pool, Shark’s bay in Western Australia.

Answer 9

PaleoArchean (3.6-3.2)

Question 10

Formation of 2nd Supercontinent: Ur (half a billion years younger than Vaalbara)

Answer 10

MesoArchean (3.2-2.8)

Question 11

Appearance of Acritarchs

Answer 11

MesoArchean (3.2 - 2.8 )

Question 12

Formation of Kenorland (widely accepted supercontinent) Kenoran-Algoman Orogeny (2.7)

Answer 12

NeoArchean (2.8 - 2.5)

Question 13

Break - up of Vaalbra (2.5)

Answer 13

NeoArchean (2.8-2.5)

Question 14

Proterozoic is divided into three eras namely as;

Answer 14

Paleoproterozoic ( 2.5 - 1.6 )
Mesoproterozoic ( 1.6 - 1.2 )
Neoproterozoic ( 1.0 - 542 ma )

Question 15

Start of fragmentation of Kenorland (2.4 )

Answer 15

Paleoproterozoic ( 2.5 - 1.6 )

Question 16

GOB; which caused the FIRST glaciation event on earth - Huronian Glaciation that was persisted till 300 ma.This also caused the first mass extinction in which casualties swiped out cyanobacterias.

Answer 16

Paleoproterozoic ( 2.5 - 1.6 )

Question 17

age of Gypania, the OLDEST known MEGAfossil found in Negaunee Iron Formation in Michigan. (2.1)

Answer 17

Paleoproterozoic ( 2.5 - 1.6 )

Question 18

Onsetting of Huronian Glaciation in this age stopped the deposition of Algoma type BIF

Answer 18

Paleoproterozoic (2.5-1.6)

Question 19

Persisting of Huronian Glaciation - the first, oldest, longest ice age that covered the earth up to the equator (Snowball earth Episode 1)

Answer 19

Paleoproterozoic( 2.5 - 1.8 )

Question 20

Vredefor Crater, largest impact crater named after the town in South Africa. ( 2.02 )

Answer 20

Paleoproterozoic ( 2.5 - 1.6 )

Question 21

Sudbury Crater in Ontario Canada is the second largest impact crater. (1.85 )

Answer 21

Paleoproterozoic (2.5- 1.6)

Question 22

Formation of Supercontinet Hudsonian (1.8 to 1.5)

Answer 22

Paleoproterozoic ( 2.5 - 1.6 )

Question 23

Start fragemetation of Columbia or Hudsonian Supercontinent. ( 1.6 - 1.2 )

Answer 23

Mesoproterozoic ( 1.6 - 1.0 )

Question 24

Grenville Orogeny - significant to the final episode of next supercontinent Rodinia. ( 1.3 - 1.0 )

Answer 24

Mesoproterozoic ( 1.6 - 1.0 )

Question 25

Formation of Rodinia and its Superocean Mirovia (1.3 - 1.1 )

Answer 25

Mesoproterozoic ( 1.6 - 1.0 )

Question 26

Appearance of first eukaryote: Bangiomorpha (1.2)

Answer 26

Mesoproterozoic ( 1.6 - 1.0 )

Question 27

Cryogenian or Varangian Galciation which may be attributed to the 2nd episode of Snowball earth theory. (900 - 600).

Answer 27

Neoproterozoic (1.0 - 542 ma )

Question 28

Fragmentation of Rodinia ( 750 ma )

Answer 28

Neoproterozoic ( 1.0 - 542 ma )

Question 29

Formation of Panotia supercontinent or Vendian supercontinent or Greater Gondwana or the Pan African Supercontinent. (650 ma )

Answer 29

Neoproterozoic ( 1.0 - 542 ma )

Question 30

Ediacaran Fauna ( soft body marine organisms ) ( 630 - 542 ma ).

Answer 30

Neoproterozoic ( 1.0 - 542 )

Question 31

Fragmetation of Panotia and the starting of formation of Iapetus Ocean. (550)

Answer 31

Neoproterozoic ( 1.0 - 542 ma )