Limestone, dolomite, and argillaceous dolomite
Dolomite, limestone, and argillaceous dolomite
Sexton Creek Limestone at base in Kentland area and on cross-section
Shale and limestone; upper part of Maquoketa Group in deep buried valleys; Maquoketa to upper part of Knox Supergroup in Kentland area
Dolomite, gray, yellow-gray to olive-gray, laminated to thin bedded; occasional thin bed and laminae of dark gray shale and anhydrite and/or gypsum; brecciated zones in part.