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To continue Hermann Pfefferkorn's reply,
If you look at the paleographic reconstructions you'll find that the area
of present day South America was generally south of the tropical zones
where high growth rate and plant diversity would be expected. Major coal
basins in North America (like the Illinois and Appalachian Basins) were at
or near the equator, however. In the Permian, South America is in a more
equatorial position. For example, see
http://www.scotese.com/earth.htm
Brandon Nuttall
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