Environmental Studies

A Dictionary of Earth Sciences A Dictionary of Ecology Further reading

erathem

A Dictionary of Earth Sciences | 1999 | | Copyright

erathem The chronostratigraphic unit that is equivalent to the geologic-time unit era. An erathem comprises a number of systems grouped together and takes its name from the corresponding era, e.g. the Mesozoic Erathem would refer to the rocks laid down during the Mesozoic Era. At present it is a little used term.

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AILSA ALLABY and MICHAEL ALLABY. "erathem." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "erathem." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-erathem.html

AILSA ALLABY and MICHAEL ALLABY. "erathem." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-erathem.html

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erathem

A Dictionary of Ecology | 2004 | | Copyright

erathem See era.

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MICHAEL ALLABY. "erathem." A Dictionary of Ecology. 2004. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "erathem." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O14-erathem.html

MICHAEL ALLABY. "erathem." A Dictionary of Ecology. 2004. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-erathem.html

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