Research topic:aging

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Find more facts and information on our topic page about aging

age

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

age
1. The interval of geologic time equivalent to the chronostratigraphic unitstage’. Ages are subdivisions of epochs and may themselves be subdivided into chrons. An age takes its name from the corresponding stage, so like the stage name it carries the suffix ‘-ian’ (or sometimes ‘-an’); the term ‘age’ is capitalized when used in this formal sense, e.g. ‘Oxfordian Age’.

2. An informal term to denote a time span marked by some specific feature, e.g. ‘Ville-franchian mammalian age’.

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AILSA ALLABY and MICHAEL ALLABY. "age." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 16 Nov. 2009 <http://www.encyclopedia.com>.

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