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Overview

geochronology

The chronology of the Earth generated from geological information; the science of the absolute and relative dating of geological formations and events.

geochronology

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A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... The chronology of the Earth generated from geological information; the science of the absolute and relative dating of geological formations and...

geochronology

geochronology   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
27 words

... a science that deals with the measurement of time in relation to the earth’s evolution. See Appendix C , 1953, Patterson; 1954, Barghoorn and Tyler; 1980,...

geochronology

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A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

... 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 ; geochronometry...

Geochronology

Geochronology   Reference library

Encyclopedia of Evolution

Reference type:
Subject Reference
Current Version:
2005

... Geochronology is the scientific study of the ages of ancient geological and archaeological deposits. Geochronologists are geologists, physicists, or chemists who use a variety of scientific methods to analyze geological, biological, and artifactual materials to determine the time when they were formed or deposited. Geochronological measurements are based on three principles: first, that some physical process has been steadily affecting the material to be dated; second, that we can measure the extent to which the process has occurred, usually by...

geochronology

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A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... The science of absolute and relative dating of geological formations and...

geochronology

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A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... 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...

planktonic geochronology

planktonic geochronology   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
37 words

...geochronology The use of planktonic organisms (e.g. microscopic algae) to provide a relative dating of sediments deposited in marine waters. Radioactive-decay methods applied to planktonic organisms may also yield an absolute date or information on...

planktonic geochronology

planktonic geochronology   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...geochronology The use of planktonic organisms, e.g. globigerinid foraminiferids or microscopic algae , to provide a relative dating of sediments deposited in marine waters. Radioactive-decay methods applied to planktonic organisms may also yield an absolute date or information on...

planktonic geochronology

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A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

...geochronology The use of planktonic organisms (e.g. globigerinid foraminiferids or microscopic algae) to provide a relative dating of sediments deposited in marine waters. Radioactive-decay methods applied to planktonic organisms may also yield an absolute date or information on...

stratigraphy and geochronology

stratigraphy and geochronology   Reference library

The Oxford Companion to the History of Modern Science

Reference type:
Subject Reference
Subject:
Science and technology, History of Science
Length:
1,142 words

...and geochronology . The principles of stratigraphy— the study of the earth's strata or layers of sedimentary rock— and of geochronology— the naming and describing, though not necessarily dating, of the periods of earth history— were established rapidly between 1810 and 1840 . For the next century, stratigraphers filled in the details of the stratigraphic column with ever-greater precision. Much of this research could be put to good use by the mining industry, and from the 1920s and 1930s by the petroleum industry. Although stratigraphy flowered in...

geochronology

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New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
48 words
geochronology

geochronology noun   Reference library

Australian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2004
Subject:
English Dictionaries and Thesauri
Length:
29 words
geochronology

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Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
49 words
geochronology

geochronology noun   Reference library

The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
36 words
geochronology

geochronology noun   Reference library

The New Zealand Oxford Dictionary

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
35 words
geochronology

geochronology  

The chronology of the Earth generated from geological information; the science of the absolute and relative dating of geological formations and events.
planktonic geochronology

planktonic geochronology  

The use of planktonic organisms (e.g. globigerinid foraminiferids or microscopic algae) to provide a relative dating of sediments deposited in marine waters. Radioactive-decay methods applied to ...
Unified Stratigraphic Time-scale

Unified Stratigraphic Time-scale  

(UTS)A proposed universal time-scale that would combine both absolute and relative time-scales (see geochronology) that have been deduced by all possible means, including biostratigraphy, ...
samarium–neodymium dating

samarium–neodymium dating  

The change from 147Sm to 143Nd is the result of alpha decay (147Sm has a half-life of 2.5 × 1011 years) and provides one of the newest methods of dating used in geochronology. The decay enriches the ...
Archaeological Inference

Archaeological Inference  

The earliest archaeological sites on earth, dating to around the same time as the earliest fossils of the genus Homo, are simple patches of stone tools, intermixed sometimes with broken ...

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