Geologic units in Jay county, Indiana

Louisville Limestone through Brassfield Limestone (Silurian) at surface, covers 90 % of this area: Louisville Limestone through Brassfield Limestone - Sexton Creek Limestone at base in Kentland area and on cross-section
Lithology: limestone
Ordovician rocks, undifferentiated (Silurian) at surface, covers 7 % of this area: Ordovician rocks, undifferentiated - Shale and limestone; upper part of Maquoketa Group in deep buried valleys; Maquoketa to upper part of Knox Supergroup in Kentland area
Lithology: shale ; limestone; dolostone (dolomite)
Pleasant Mills Formation (Silurian) at surface, covers 4 % of this area: Pleasant Mills Formation - Dolomite, limestone, and argillaceous dolomite
Lithology: dolostone (dolomite); limestone