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ID number:749554
 
Evaluation:
Published: 26.10.2007.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Aīdas eona – sākās pirms 4,55, beidzās pirms 3,9 gadu miljardiem.
2. Arheozoja eona – sākās pirms 3,9, beidzās pirms 2,5 gadu miljardiem.
3. Proterozoja eona – sākās pirms 2,5, beidzās pirms 0,54 gadu miljardiem.
4. Fanerozoja eona – sākās pirms 0,54 gadu miljardiem un turpinās mūsdienās.
1)Paleozoja ēra
a)Kembrijs – sākās pirms 540 un beidzās pirms 505 gadu miljoniem.
b)Ordoviks – sākās pirms 505 un beidzās pirms 440 gadu miljoniem.
c)Silūrs – sākās pirms 440 un beidzās pirms 410 gadu miljoniem.…

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