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geochronology

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absolute age

absolute age  

The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (compare relative age). The term ‘absolute age’ has been considered rather ...
absolute dating

absolute dating  

Reference type:
Overview Page
Subject:
Archaeology
A range of methods for determining the absolute age of an object or material, for example using radiometric dating which measures the decay product produced by radioactive decay in minerals, or via ...
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 ...
dating methods

dating methods  

During the last century geologists constructed a relative time-scale based on correlation of palaeontological and stratigraphic data. Depositional rates of sediments have also been employed as a ...
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

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 ...
geophysics

geophysics  

The science concerned with all aspects of the physical properties and processes of the Earth and planetary bodies and their interpretation, including, for example, seismology, gravity, magnetism, ...
isochron

isochron  

1 A line on a map which connects points which have the same time or time interval.2 In geology, a line of equal age on a graph.
isotope geochemistry

isotope geochemistry  

The study of the abundance ratios of isotopes (both stable and radioactive) of major and trace elements in rocks (e.g. Rb/Sr, Pb/U, etc.), to elucidate a number of geologic problems and processes. ...
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 ...
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, ...

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