Geochronology

（重定向自Absolute Age）

A schematic depiction of the major events in the history of Earth

Tephra horizons in south-central Iceland. The thick and light-to-dark coloured layer at the height of the volcanologists hands is a marker horizon of rhyolitic-to-basaltic tephra from Hekla.

Geochronology is the science of determining the age of rocks, fossils, and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes, whereas relative geochronology is provided by tools such as palaeomagnetism and stable isotope ratios. By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.

单词	Absolute Age
释义	Absolute Age 英语例句库 Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age. 可以对树木的年轮和被称为纹泥的季节性沉积物进行计数来确定其绝对年龄。英语百科 Geochronology （重定向自Absolute Age） Geochronology is the science of determining the age of rocks, fossils, and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes, whereas relative geochronology is provided by tools such as palaeomagnetism and stable isotope ratios. By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.
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