In outcrops about three miles below Georgetown on the Little Vermilion
River, a number of fossil plant species and one insect species have been
collected from shales overlying the Herrin (No. 6) Coal, locally called
the Grape Creek Coal. The fossils occur in concretions much like those
from Mazon Creek.
An occasional stem replacement or impression is found in the
concretionary shale above the No. 7 Coal in the strip mine area west of
Hillery. In fact, isolated fragmentary plant specimens are fairly common
in the Danville mining area, but no especially productive localities
have come to light.