Geologic units in Randolph county, Indiana

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 86 % of this area

Sexton Creek Limestone at base in Kentland area and on cross-section

Ordovician rocks, undifferentiated (Silurian) at surface, covers 7 % of this area

Shale and limestone; upper part of Maquoketa Group in deep buried valleys; Maquoketa to upper part of Knox Supergroup in Kentland area

Pleasant Mills Formation (Silurian) at surface, covers 6 % of this area

Dolomite, limestone, and argillaceous dolomite

Whitewater Formation (Ordovician) at surface, covers 0.6 % of this area

Skeletal limestone and calcareous shale; dolomitic mudstone (S, Saluda Member) at base