(definition) by Webster 1913 Thu Jan 19 2006 at 8:08:38

Tran*si"tion zone. (Biogeography)

The zone lying between the Boreal and Sonoran zones of North America. It includes an eastern or humid subdivision and a western arid one of corresponding temperature comprising the northern Great Plains and the lower slopes of the mountains of the western United States and Mexico. Called also Neutral zone.

 

© Webster 1913

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