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The Neoarchean (/ ˌ n iː oʊ. ɑːr ˈ k iː ə n / NEE-oh-ar-KEE-ən; also spelled Neoarchaean) is the last geologic era in the Archean Eon that spans from 2800 to 2500 million years ago—the period being defined chronometrically and not referencing a specific level in a rock section on Earth.
Neoarchean: 2,800 2,500 era Archean ICS Plumb, 1991 Neocomian: 145.5 125.0/130.0 epoch obsolete Neocomium, Latin name for Neuchâtel: Thurmann, 1835 Neogene: 23.0 2.588 period Cenozoic ICS Hoernes, 1856 Neoproterozoic: 1,000 542.0 ± 1.0 era ICS Hofmann, 1987 Neporatan: 2.5 1.7 age Pleistocene Eastern Europe Esu, 1980 Neustrian: 55.0 50.8 ELMMZ ...
Period/Era Range Type Comments Sources Amazonia: Craton [1] [2] [3] Arabia–Nubia: 610 Neoproterozoic Microcontinent Rifted off Rodinia at about 840 Ma. Then accreted to North Africa with large volume of juvenile crust during the Pan-African orogeny to form the Arabian-Nubian Shield. [4] [5] Arctica: 2565 Neoarchean Supercraton [6] Argoland: 155
By the Neoarchean, plate tectonic activity may have been similar to that of the modern Earth, although there was a significantly greater occurrence of slab detachment resulting from a hotter mantle, rheologically weaker plates, and increased tensile stresses on subducting plates due to their crustal material metamorphosing from basalt into ...
An era is the second largest geochronologic time unit and is equivalent to a chronostratigraphic erathem. [14] [13] There are ten defined eras: the Eoarchean, Paleoarchean, Mesoarchean, Neoarchean, Paleoproterozoic, Mesoproterozoic, Neoproterozoic, Paleozoic, Mesozoic and Cenozoic, with none from the Hadean eon. [2]
Homininaeid Era – Period prior to the existence of Homininae Homininid Era – Period prior to the existence of Hominini Prehistory – Period between the appearance of Homo ("humans"; first stone tools c. three million years ago) and the invention of writing systems (for the Ancient Near East : c. five thousand years ago).
c. 1,000 Ma – Neoproterozoic Era and Tonian Period start. Grenville orogeny ends. First radiation of dinoflagellates and spiny acritarchs – increase in defensive systems indicate that acritarchs are responding to carnivorous habits of dinoflagellates – decline in stromatolite reef populations begins.
Due to the sparse exposure of pre-Neoarchean rocks, only the tectonic settings of the rocks generated from 2.7 to 1.85 billion years ago (during the Neoarchean and Paleoproterozoic Era) are thought to be understood. [1] These settings include a Large Igneous Province event, mantle plume activity, continental collisions, rifting and subductions ...