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St. Francois Mountains
The
St. Francois Mountains
in southeast
Missouri
are a range of
Precambrian
igneous
mountains rising over the
Ozark Plateau
. This range is one of the oldest exposures of igneous
rock
in North America. The name of the range is spelled out as
Saint Francois Mountains
in official
GNIS
sources, but it is sometimes misspelled in use as
St. Francis Mountains
to match the
anglicized
pronunciation of both the range and
St. Francois County
.
[1]
http://libraryphoto.cr.usgs.gov/cgi-bin/show_picture.cgi?ID=ID. Hamilton
, W.B. 1329ct]
[2]
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