The geological time scale (GTS) is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earth’s history. The table of geologic time spans presented here agrees with the nomenclature, dates and standard color codes set forth by the International Commission on Stratigraphy.

1. EarlyGeological Time Scale
Submitted by: Ali Rind

2. THE GEOLOGICAL TIME
SCALE
 The geological time scale (GTS) is a system
of chronological measurement that relates
stratigraphy to time, and is used by geologists,
paleontologists, and other Earth scientists to
describe the timing and relationships between
events that have occurred throughout Earth’s
history. The table of geologic time spans
presented here agrees with the nomenclature,
dates and standard color codes set forth by the
International Commission on Stratigraphy.

3. FORMATION OF SOLAR SYSTEM

4. FORMATION OF EARTH

5. FORMATION OF FIRST DNA

6. FORMATION OF
UNICELLULAR

7. FORMATION OF
MULTICELLULAR

8. GEOLOGICAL EON

9. PHANEROZOIC ERA
PRECAMBRIAN PERIOD

10. HADEAN, ARCHEAN, PETROZOIC and
PHANEROZOIC

11. CAMBRIAN PERIOD

12. SILURIAN PERIOD

13. ORDOVICIAN PERIOD

14. DEVONIAN PERIOD

15. CARBONIFEROUS PERIOD

16. CRETACEOUS
PERIOD

17. PERMIAN PERIOD

18. MESOZOIC
ERATRIASSIC PERIOD

19. JURASSIC
PERIOD

20. CENOZOIC ERA
TERTIARY
PERIOD

21. TERTIARY
PERIODAnimals

22. QUATERNARY
PERIOD