Requires Adobe® Acrobat® Reader®.Plate 1.  Map of Indiana showing locations of type sections, localities, and area for Paleozoic rock units named for Indiana places 682K.

Requires Adobe® Acrobat® Reader®.Plate 2.  Charts showing Paleozoic rock-unit names used in Indiana: A, Pennsylvanian; B, Mississippian; C, Devonian; D, Silurian; E, Ordovician and Cambrian 1250K.

Figure 1.  Chart showing significant development in nomenclature of the Sanders Group.

Figure 2.  Chart showing correlation of rocks of the Blue River Group with rocks of the formational type area in Illinois and Missouri.

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