Of
Fernville Limestone (Upper Ordovician)
Opl
Plattin Limestone (Middle Ordovician)
Osp
St. Peter Sandstone (Middle Ordovician)
Op
Powell Dolomite (Lower Ordovician)
river
Qal
Alluvial deposits (Quaternary)
Qty
Younger terrace and channel alluvial deposits (Quaternary)
QTto
Older terrace and alluvial deposits (Quaternary and Tertiary (?))
Mbv
Batesville Sandstone (Upper Mississippian, Chesterian)
Mbs
Boone Formation, St. Joe Limestone Member (Lower Mississippian, Osagean to Kinderhookian)
Mb
Boone Formation, Main body (Upper to Lower Mississippian, Meramecian to Osagean)
Oeu
Everton Formation, upper part (Middle Ordovician)
Oel
Everton Formation, lower part (Middle Ordovician)