In general usage, an eon (sometimes spelled æon) is an arbitrarily designated period of time. Geologists refer to an eon as the largest subdivision of time on the geologic time scale. A geologist is a contributor to the Science of Geology, studying the physical structure and processes of the Earth and planets of the solar system The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other For example, the Phanerozoic Eon, which is about 550 million years long, covers the period of time during which animals with hard shells that fossilize would have been abundant. The Phanerozoic (occasionally Phanaerozoic) Eon is the current eon in the Geologic timescale, and the one during which abundant animal life has existed FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system.
An eon is composed of several geologic eras, which in turn are composed of geologic periods, which are composed of geologic epochs. The geologic time scale is a chronologic schema (or idealized Model) relating Stratigraphy to time that is used by Geologists and other We are currently in the Phanerozoic Eon, the Cenozoic Era, the Quaternary Period, and the Holocene epoch. The Phanerozoic (occasionally Phanaerozoic) Eon is the current eon in the Geologic timescale, and the one during which abundant animal life has existed The Cenozoic (also Caenozoic or Cainozoic) Era (ˌsiːnəˈzoʊɪk/ /ˌsɛn- (meaning "new life" ( Greek ( kainos) "new" Overview The term Quaternary ("fourth" was proposed by Giovanni Arduino in 1759 for alluvial deposits in the Po river valley in northern The Holocene is a Geological epoch which began approximately 10000 years ago (about 8000 BC Formerly, only one eon existed besides the Phanerozoic: the Precambrian. The Precambrian ( Pre-Cambrian) is an informal name for the supereon comprising the eons of the Geologic timescale that came before the current More recently, the Hadean, Archean, and Proterozoic "eras" of Precambrian time have been considered eons. The Hadean (ˈheɪdiən is the geologic eon before the Archean. The Proterozoic (ˌproʊtərəˈzoʊɪk is a geological eon representing a period before the first abundant complex life on Earth. The geologic timescale in terms of eons, eras, and periods looks like this:
Greek root
The English word eon is derived from the Koine Greek word aion. Koine Greek (Κοινὴ Ἑλληνική, "common Greek" or, ciˈni ðiˈale̞kto̞s "the common dialect" is the popular form of Greek which emerged in
Although a proposal was made in 1957 to define an aeon to be a unit of time equal to one billion years (1 Ga), the idea was not approved as a unit of scientific measure and is seldom used for a specific period of time. The word aeon, also spelled eon or æon, means "age" "forever" or "for Eternity " Its more common usage is for any lengthy or indefinite period of time. The origin is from the Greek root "aion" for "age" or "life force. " A similar Latin word "aevum" for age is still present in words such as longevity and medieval. [1]
See also
References
- International Stratigraphic Chart from the International Commission on Stratigraphy
- USA National Park Service
- Washington State University
- Web Geological Time Machine
- Eon or Aeon, Math Words - An alphabetical index
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