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E3OLUTIA PALEOGEOGA4ICA

A TEEI

"ttp#$$000&ru/&rice&e%u$5leeman$aN&"tm

l

http://www.ruf.rice.edu/~leeman/aNR.htmhttp://www.ruf.rice.edu/~leeman/aNR.htm

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"ttp#$$000&ru/&rice&e%u$5leeman$aN&"tml

E3OLUTIA 3IETII PE TEA

http://www.ruf.rice.edu/~leeman/aNR.htmlhttp://www.ruf.rice.edu/~leeman/aNR.html

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+& GEOCONOLOGIE

Geocronologia este o ramura a stratigrafie care seocupa cu datarea (stabilirea vrstei) depozitelorgeologice si ierarhizarea cronologica a acestora,

rezultnd unitai geocronologice (de timp), concretizate nunitai cronostratigrafice.

Datarea se poate face relativ, aplicndu-se corelarile pornind de la principiul superpoziei

geometrice a stratelor si evoluiei organismelor biologice

n mod absolut, folosindu-se metode radiometrice.

Unitati geocronologice !"#, !$%, &!$'"%%, !&"%,*%$+%, $"#

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DATAEA PIN METODE

ADIOMETICE

36rste absolute

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Eon Era Perioa%ainceput - s/arsit7mil&ani8

P"anerooic Eon# PH

Cenooic Era#

C.

Neogen N )9&* -

Paleogen E 2:&: - )9&*

Mesooic Era#M.

Cretacic ; + - ):+Carboni/er C 9:> - )>>

De!onian D

?ilurian ?

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Istoria

geologicaa Pamantului

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I EONUL PECAMBIAN

II& EONUL 4ANEO.OIC

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EON EA ?PAN 7Ma8 Notes an% E!ents

&roterozoic

Paleoproterozoic

2500 - 2300

myaore or less conventional plate tectonics

Arc"ean

Neoarc"ean2800 - 2500mya

irst large continental shields

Mesoarc"ean

3200 - 2800mya

irst /idel0-accepted fossil evidence of life. irst banded iron formations.

Paleoarc"ean

3600 - 3200

mya

irst stromatolites1 ormation of relativel0 stable crust units (possibl0 even earlier ,but seegenerall0 negative revie/ .

Eoarc"ean~3800 - 3600mya

ebatable geochemical evidence for life (no longer /idel0 accepted)

2adean Early Imbrian3850 - 3800

myaLate heavy bombardment of Earth-moon system.

I& EONUL PECAMBIAN -CAACTEI.AE"ttp#$$palaeos&com$timescale$precambrian&"tm

+& AHAIC 7T"e Arc"ean Eon #"ttp#$$palaeos&com$ "ttp#$$palaeos&com$arc"ean$in%e&"tml 8

http://palaeos.com/proterozoic/paleoproterozoic/paleoproterozoic/paleoproterozoic.htmlhttp://palaeos.com/proterozoic/paleoproterozoic/paleoproterozoic/paleoproterozoic.htmlhttp://palaeos.com/timescale/precambrian.htmhttp://palaeos.com/http://palaeos.com/archean/index.htmlhttp://palaeos.com/archean/index.htmlhttp://palaeos.com/http://palaeos.com/http://palaeos.com/http://palaeos.com/timescale/precambrian.htmhttp://palaeos.com/proterozoic/paleoproterozoic/paleoproterozoic/paleoproterozoic.htmlhttp://palaeos.com/proterozoic/paleoproterozoic/paleoproterozoic/paleoproterozoic.html

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)& POTEO.OIC- CAACTEI.AE "ttp#$$

palaeos&com$proterooic$proterooic&"tm"ttp#$$palaeos&com$proterooic$proterooic&"tm

3 4eografia &roterozoicului

http55palaeos.com5proterozoic5proterozoic.htm

6 *iata in &roterozoic

http55palaeos.com5proterozoic5proterozoic.htm

http://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htmhttp://palaeos.com/proterozoic/proterozoic.htm

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eon era perioada% inceput acum(mil ani)

urata (mil ani)

anerozoic

7 #eozoic(enozoic)

#eogen 67.8 67.8

&aleogen 9:.: ;6.:

6 ezozoic

retacic 3;9 > ; 98

evonian ;39 :?

+ilurian ;;; 6