603-pp9 - Archean Eoarchean 3.8 3.6 Ga Archean Oceans Orin...

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1 Archean Oceans Orin Robinson Archean Eoarchean: 3.8 - 3.6 Ga – oldest known terrestrial rocks – possible beginning of formation of first supercontinent believed to have existed as far back as 3.6 Ga – debatable geochemical evidence for life not widely accepted Archean • Paleoarchean: 3.6 - 3.2 Ga evidence for the first stromatolites formation of the first stable crusts still being debated http://www.wmnh.com/wmel0000.htm Archean Mesoarchean: 3.2 - 2.8 Ga first widely accepted fossil evidence of life banded iron formations www.amnh.org http://www.uwsp.edu/geo/faculty/hefferan/Geol106/ CLASS3/ARCHEAN%20LIFE.htm Archean • Neoarchean: 2.8 - 2.5 Ga first large continental shields http://www.uwsp.edu/geo/faculty/hefferan/Geol106/CLASS3/archean_rocks.htm Archean Tectonics Interior of the Earth was 3x hotter than today Rapid formation and recycling of oceanic crusts Many small plates and volcanic islands http://www.cotf.edu/ete/modules/msese/earthsysflr/cambrian.html
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