Near DuQuoin and Murphysboro, a variety of well preserved plant fossils
has been collected from shales overlying both the Herrin (No. 6) Coal
and the Murphysboro Coal. Nearly all have come from shaft mines that are
not easily accessible to the collector.
One currently good outcrop locality for collecting plant fossils from
the shale above the Murphysboro Coal is just southeast of Murphysboro.