
Gastornis is an extinct genus of large flightless birds that lived during the late Paleocene and Eocene epochs of the Cenozoic era. The genus is currently thought to contain three or four distinct species, known from incomplete fossil remains, found in western-central Europe (England, Belgium, France and Germany). More complete specimens are known...
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http://en.wikipedia.org/wiki/Gastornis

• (n.) A genus of large eocene birds from the Paris basin.
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http://thinkexist.com/dictionary/meaning/gastornis/
Gas·tor'nis noun [ New Latin , from
Gaston M. Plante, the discover + Greek ... bird.]
(Paleon.) A genus of large eocene birds from the Paris basin.
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http://www.encyclo.co.uk/webster/G/12
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