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A Dictionary of Earth Sciences A Dictionary of Ecology A Dictionary of Zoology Further reading

chron

A Dictionary of Earth Sciences | 1999 | | Copyright

chron
1. A small unit of geologic time, equivalent to the chronostratigraphic unit chronozone, usually based on fossil zonation (see BIOCHRON). When used formally (e.g. Gilbert Chron) the initial letter is capitalized.

2. A single time interval of constant polarity of the geomagnetic field (polarity chron).

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AILSA ALLABY and MICHAEL ALLABY. "chron." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "chron." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-chron.html

AILSA ALLABY and MICHAEL ALLABY. "chron." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-chron.html

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chron

A Dictionary of Ecology | 2004 | | Copyright

chron
1. A small unit of geologic time, equivalent to the chronostratigraphic unit chronozone, that is usually based on fossil zonation. When used formally (e.g. Gilbert Chron) the initial letter is capitalized.

2. (polarity chron) A single time interval of constant polarity of the geomagnetic field.

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MICHAEL ALLABY. "chron." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "chron." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-chron.html

MICHAEL ALLABY. "chron." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-chron.html

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chron

A Dictionary of Zoology | 1999 | | Copyright

chron A subdivision of geological time based on the direction of magnetization, as preserved in rocks of the period. Within many chrons there are shorter periods of alternate magnetization (subchrons). The two most recent chrons in Earth history are the Matuyama (reversed) and Brunhes (normal).

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MICHAEL ALLABY. "chron." A Dictionary of Zoology. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "chron." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-chron.html

MICHAEL ALLABY. "chron." A Dictionary of Zoology. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-chron.html

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