Guest Book

Senākā geologiskā ēra

30, 2008, 17:53

Olga

:-:

Pēc starptaut. stratigr. komisijas domām (kas bieži mainās un gluži nesakrīt ar piem., Latvijas zinātnieku publikācijām) arhaja eona vecākā ēra ir eoarhajs, kas beidzās pirms 3600 milj. Vēl pag. gadā tā sākums nebija noteikts, tagad (2008.g.) ir pieņemts, ka tas sākās p 4000 milj.
Vēl vecāks ir Hadean (Hadesijs? Aīdijs? - kā latviski, nav noteikts), sācies apm. vēl 600 milj. agrāk, bet tas nav ēras, drīzāk eona statusā.
http://www.stratigraphy.org/cheu.pdf

1, 2008, 13:04

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