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Fig. 4. Chronostatigraphic section of North Louisiana. (From
Shreveport Geological Society, 1987.) Note: The Schuler Formation
of the Cotton Valley 
Group
has only recently been assigned to the
Lower Cretaceous; most authors prior to the 1980s assigned it to
the Upper Jurassic. Also note that outcropping beds of the Eocene
Claiborne Group (including the Cook Mountain Formation) that lie
immediately above the Wilcox Group
are not shown.