transition zone

1 definition found

transition zone - Collaborative International Dictionary of English v.0.48 :

  Transition zone \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 Suppl.]