The quarry of Western Indiana Aggregates, Inc., south of Francesville, Indiana, was examined to determine the relation off its stratigraphy and paleontology to that of other Silurian (Niagaran) outcrops of northern Indiana. Lithologic analysis and paleoecologic interpretations of 25 genera of fossils found in the quarry were utilized in the investigation.Strata exposed at the Francesville locality belong to the Liston Creek Member of the Wabash Formation. The exposure reveals a reef core, reef-flank and back-reef platform which are identified by their attitude and fossil content. The coral Ealysites is interpreted as being a deep-water (low reef-flak dweller while the rugose coral, Strombodes is a rough water (reef core) form. Distribution of pentamerids and trilobites also yields evidence of selective zoning. The occurrence of a coquina of the pentamerid Kirkidium is significant. The bed is believed to have formed as the result of a storm lowering wave base sufficiently to expose the living Kirkidium colony and subjecting it to surf activity. Detailed examination of individual specimens within the unit reveal the storm approached the reef from the south-southwest. Normal (non-storm) current direction was also from the south-southwest, as demonstrated by the location of the back water reef platform north of the reef core.Ball State UniversityMuncie, IN 47306