Geologic units in Jay county, Indiana

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 90 % 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 4 % of this area

Dolomite, limestone, and argillaceous dolomite