Geologic Timescale

Question 1

4.5 Ga to 542 Ma ( 88% of GTS)

Answer 1

Precambrian

Question 2

4.5 - 3.85 Ga

Answer 2

Hadean Eon (1.0)

Question 3

Formulation of the Universe (13.7 Ga)

Answer 3

Bigbang theory

Question 4

4.546 Ga

Answer 4

Formation of Earth

Question 5

4.50 Ga

Answer 5

Formation of earth’s moon: Thea hypothesis

Question 6

4.4 Ga

Answer 6

Age of zircon grain (oldest mineral)

Question 7

4.03 Ga

Answer 7

Acasta gneiss ( age of oldest continental crust)

Question 8

4.0 to 3.8 Ga

Answer 8

First water brought by carbonaceous chondrite ( late heavy bombardment)

Question 9

3.85 to 2.5 Ga

Answer 9

Archean eon (2.0)

Question 10

3.85-3.6 Ga

Answer 10

EoArchean era (2.1)

Question 11

3.8 to 3.1 gg

Answer 11

First algoma-type BlF

Question 12

3.8 to 3.7 Ga

Answer 12

Greenland Stromatolite in Isua Supracrustal belt

Question 13

3.6 to 3.1 Ga

Answer 13

Formation of first theorized supercontinent: Vaalbara

Question 14

3.6 to 3.2 Ga

Answer 14

Paleoarchean era( 2.2)

Question 15

3.5 to 3.3 Ga

Answer 15

Archean stromatolite in Hamelin

Question 16

3.5 Ga

Answer 16

Cyanobacteria ( blue-green algae)- first bacteria

Question 17

3.2 to 2.8 Ga

Answer 17

Mesoarchean (2.3)

Question 18

2.8 to 2.5 Ga

Answer 18

Neoarchean era

Question 19

3.2 to 1.4 Ga

Answer 19

Acritarchs (cyst of planktonic algae)