The St. Peter Sandstone is in facies relationship eastward in Indiana with two carbonate units, the Dutchtown Formation and the overlying Joachim Dolomite. The thin sandy dolomite lenses in the lower part of the St. Peter in Posey County contain a faunule that is fairly abundant but is low in diversity. Multioistodus subdentatus Cullison comprises more than 90 percent of the conodonts. The sampled part of the St. Peter correlates with part of the Dutchtown Formation of Missouri.
Rexroad, C. B., Droste, J. B., and Ethington, R. L., 1982, Conodonts from the Everton Dolomite and the St. Peter Sandstone (Lower Middle Ordovician) in a core from southwestern Indiana: Indiana Geological Survey Occasional Paper 39, 13 p., 7 figs., 1 table, 2 pl.
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