11 miles SW of Marion, Indiana.
Possibly older (Ludlov).
48 m thick and 1.8 km wide.
Steep flanks. Reef crest with Renalcis-stromatopore-tabulate coral framestone.
Reef flank with bryozoans, stromatactis, stromatopores, corals in pack-, rud-, bind- and framestones.
Highest porosity in interreef sediments.
Fossil in collection (Miller) were collected from the flank beds of the reef. Five lithologies were recognized: limestone, swirly limestone, dolomite and dolomitic limestone, silty mudstone, and interreef siltstone. 97% of the beds in the measured sections were limestone or swirly limestone. limestone described as white to gray, coarse-grained, and highly fossiliferous. swirly limestone described as argillaceous, characterized by milky while sparry calcite mixed with stringers and blobs of green silt to clay sized particles, medium to coarse-grained gray limestone and echinodermal debris