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geochronology

geochronology Determination of time intervals on a geologic scale, through either absolute or relative dating methods. Absolute dating methods involve the use of radioactive elements and knowledge of their rates of decay: this yields an actual age in years for a given rock or fossil. Relative dating involves the use of fossils or sediments to place events and rock sequences in order, and does not provide absolute dates. See also DATING METHODS; ABSOLUTE AGE; RELATIVE AGE; PLANKTONIC GEOCHRONOLOGY; and GEOCHRONOMETRY.

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"geochronology." A Dictionary of Earth Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"geochronology." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology

"geochronology." A Dictionary of Earth Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology

geochronology

geochronology The determination of time intervals on a geologic scale, through either absolute or relative dating methods. Absolute dating methods involve the use of radioactive elements and knowledge of their rates of decay: this yields an actual age in years for a given rock or fossil. Relative dating involves the use of fossils or sediments to place events and rock sequences in order, and does not provide absolute dates.

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"geochronology." A Dictionary of Ecology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"geochronology." A Dictionary of Ecology. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology-0

"geochronology." A Dictionary of Ecology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology-0

geochronometric scale

geochronometric scale (chronometric scale) A time-scale based on years BP (conventionally before 1950). Subdivisions on the scale are defined by particular units of duration (e.g. 106 years, 109 years) rather than reference points in actual rock successions. An example of such a subdivision is the placing of the boundary between the Archaean and the Proterozoic at 2500 Ma (i.e. 2500 × 106 years) ago.

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"geochronometric scale." A Dictionary of Earth Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"geochronometric scale." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometric-scale

"geochronometric scale." A Dictionary of Earth Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometric-scale

geochronometric scale

geochronometric scale(chronometric scale) A time-scale based on years bp (conventionally before 1950). Subdivisions on the scale are defined by particular units of duration (e.g. 106 years, 109 years) rather than reference points in actual rock successions. An example of such a subdivision is the placing of the boundary between the Archaean and the Proterozoic at 2500 Ma (i.e. 2500 × 106 years) ago.

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"geochronometric scale." A Dictionary of Ecology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"geochronometric scale." A Dictionary of Ecology. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometric-scale-0

"geochronometric scale." A Dictionary of Ecology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometric-scale-0

geochronometry

geochronometry The determination of the length of time intervals. Geochronometric resolutions for zonations based on different organisms may be calculated by dividing the time-span of a series by the number of zones and the intervals between zones. However, this will give only an approximate measure of time. See also DATING METHODS; and GEOCHRONOLOGY.

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"geochronometry." A Dictionary of Earth Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"geochronometry." A Dictionary of Earth Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometry

geochronometry

geochronometry The determination of the length of time intervals. Geochronometric resolutions for zonations based on different organisms may be calculated by dividing the time-span of a series by the number of zones and the intervals between zones. However, this will give only an approximate measure of time.

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"geochronometry." A Dictionary of Ecology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

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"geochronometry." A Dictionary of Ecology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronometry-0

geochronology

geochronology See varve dating.

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"geochronology." A Dictionary of Biology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"geochronology." A Dictionary of Biology. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology-1

"geochronology." A Dictionary of Biology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/geochronology-1