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This clock representation shows some of the major units of geological time and definitive events of Earth history.
The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga (billion years ago).
2.15 Ga Sengoma Argillite Formation, Botswana: Evidence for oxidative continental weathering during the Great Oxidation Event, Chemical Geology, v.
J., Bekker, A., 2009, U-Th-Pb-REE systematics of organic-rich shales from the ca. Pollack et al., 2009Guo, Q., Strauss, H., Kaufman, A. A., Bekker, A., Kim, S.-T., Farquhar, J., 2009, Reconstructing Earth's surface oxidation across the Archean-Proterozoic transition, Geology, v.
Eons are divided into eras, which are in turn divided into periods, epochs and ages.
The following four timelines show the geologic time scale.
It includes the study of fossils to determine organisms' evolution and interactions with each other and their environments (their paleoecology). Paleontology lies on the border between biology and geology, but differs from archaeology in that it excludes the study of anatomically modern humans. "Human Remains from the Pleistocene-Holocene Transition of Southwest China Suggest a Complex Evolutionary History for East Asians." PLo S ONE 7, no. Breakup and early seafloor spreading between India and Antarctica Gaina, Carmen, R. Signals of Barremian (116 Ma) or younger oceanic crust beneath the Bay of Bengal along 14N latitude between 81E and 93E, Mar. The primary defined divisions of time are eons, in sequence the Hadean, the Archean, the Proterozoic and the Phanerozoic.The first three of these can be referred to collectively as the Precambrian supereon.
Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon.