ප්‍රොටෙරොසොයික

Proterozoic
Proterozoic
2500 – 538.8 ± 0.2 Ma ෆැ. ප්‍රොටෙරො. ආකියානු හේඩි.
	From left to right: Four main Proterozoic events: Great Oxidation Event and subsequent Huronian glaciation; First eukaryotes, like red algae; Snowball Earth in Cryogenian period; Ediacaran biota
Chronology
−4500 — – — – −4000 — – — – −3500 — – — – −3000 — – — – −2500 — – — – −2000 — – — – −1500 — – — – −1000 — – — – −500 — – — – 0 —	P ; r ; e ; c ; a ; m ; b ; r ; i ; a ; n Hadean A ; r ; c ; h ; e ; a ; n P ; r ; o ; t ; e ; r ; o ; z ; o ; i ; c P ; h ; a ; n. Eo Paleo Meso Neo Paleo Meso Neo Paleozoic Mesozoic Cenozoic
	Scale: millions of years
Etymology
Name formality	Formal
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Eon
Stratigraphic unit	Eonothem
Time span formality	Formal
Lower boundary definition	Defined Chronometrically
Lower boundary GSSP	N/A
GSSP ratified	N/A
Upper boundary definition	Appearance of the Ichnofossil Treptichnus pedum
Upper boundary GSSP	Fortune Head section, Newfoundland, Canada; 47°04′34″N 55°49′52″W / 47.0762°N 55.8310°W
GSSP ratified	1992

ප්‍රොටෙරොසොයික යුගය (Proterozoic) යනු භූ විද්‍යාත්මක කාල පරිමාණයේ (geologic timescale) තුන්වන යුගය සහ ප්‍රාග් කෙම්බි‍්‍රයානු සුපිරි යුගයේ (Precambrian Supereon) අවසාන යුගය වේ.