paleogaean

from The Collaborative International Dictionary of English v.0.48

Paleogaean \Pa`le*o*g[ae]"an\, a. [Paleo- + Gr. gai^a the
   earth.] (Zool.)
   Of or pertaining to the Eastern hemisphere. [Written also
   {pal[ae]og[ae]an}.]
   [1913 Webster]