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ARQUEZOICO - Proterozoic 
(Precambrian) 
The time from the moment that originated on Earth to 
initiation of the Phanerozoic, including Archean and Proterozoic Eons. This time 
Earth's history isabout 87% of the age of the planet and 
represents almost 8 times the length of the Phanerozoic. 
The term Precambrian with the usual one used to designate 
this extended period is stillconsidered useful prefanerozoica although lacking the value 
formal category. 
The study of rocks and Proterozoic Archeozoic provides valuable 
information on the early stages of the formation of the earth,the origin of their 
atmosphere and hydrosphere and the characteristics of the most primitive oganismos 
inhabited. 
DIVISION 
In recent years, research prefanerozoicos land is 
increasedsignificantly, but not enough to allow development of a 
stratigraphic division thereof which has worldwide acceptance. The 
identification of major orogenic cycles and the main stages that have transited organic evolution, filled with radiometric dating, 
underlie the methodologies used in the preparation of the divisions 
proposed. 
The initiation of the Archean Eon Arquezoico or goes back tothe time of 
origin of the Earth and therefore sola5r system, an event occurred does 
about 4,600 million years, while the corresponding Eonotema starts with 
oldest known rocks, whose ages rangebetween 3,800 m by 
therefore no geological documentation of the first 800 m of 
Earth history, time for which names have been proposed such as 
Priscoano and Hadean.

ARQUEZOICO – PROTEROZOICO(PRECAMBRICO)
El tiempo transcurrido desde el momento que se originó la Tierra hasta la
Iniciación del Fanerozoico, incluye a los Eones Arqueozoico y Proterozoico. Este lapso
De la historiaterrestre equivale aproximadamente al 87% de la edad del planeta y
Representa casi 8 veces la duración del fanerozoico.
El término Precámbrico con el que frecuentemente se acostumbraba designar a
Esta...