Continental drift.
<P>
   Near  the  end  of  the  Paleozoic era (250 MYA), the major landmasses
   moved together into the supercontinent Pangaea.
<P>
   Some effects of Pangaea on life include:
<P>
<BR><LI> a reduction in shallow water habitat.
<BR><LI> a drier and colder climate inland.
<BR><LI> changes in climate as continents through latitudes.
<BR><LI> changes in ocean currents leading to global cooling.
<P>
   <A ClAsS=REF Href="../lab/plate/index.html" oNClick="popurlt('../lab/plate/index.html');txtcolor('drift1','gray');return false;" Id=drift1 ClAsS=REF>Animation.</A>