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Re: DUMB METATHERIANS vs EVIL, SMART PLACENTALS



> A large asteroid impact tends to overwhelm the usual "complexities of
ecological forces,"<

In the first few chapters of his new book, "The Eternal Frontier" (Atlantic
Monthly Press, 2001), Tim Flannery presents a general overview of the
ecological effects on North America of the Chicxulub impact and the
subsequent "reordering" of plant and animal habitats and diversity
throughout the continent during the Paleocene.  He notes several areas in
which the recovery occurred differently than one might otherwise expect, but
also offers reasons to suggest why things happened the way they did.  The
magnitude of the devastation was a definite factor, but he suggests other
things played a major role as well--such as the relative geographic
isolation of North America at the time. Interesting reading, in any event.