Pleasanton Group (IAPAp;0)

State	Iowa
Name	Pleasanton Group
Geologic age	Phanerozoic \| Paleozoic \| Carboniferous Pennsylvanian-Late [Missouri]
Original map label	Pp
Comments	Approx. thickness 40 ft. Revised to include three formations which are, in ascending order: Seminole, Lees Summit (new), and Shale Hill (new) Formations. Intra-Pleasanton unconformity occurs at base of Shale Hill. Unit and its divisions occur in western MO and southern IA, Forest City basin, Iowa shelf, and Lincoln anticline. (Howe, 1982).
Primary rock type	shale
Secondary rock type	sandstone
Other rock types	limestone; coal
Lithologic constituents	Major Sedimentary > Clastic > Mudstone > Shale (Bed) Minor Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Clastic > Sandstone (Bed) Incidental Sedimentary > Coal (Bed)
Map references	Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K
Unit references	Hershey H. G. 1969, Geologic Map of Iowa: Iowa Geological Survey, scale 1:500K Howe, W. B., 1982, Stratigraphy of the Pleasanton Group, Pennsylvanian System in Missouri: Missouri Department of Natural Resources, Open File Report Series OFR-82-IO-GI.
Geographic coverage	Adair - Appanoose - Audubon - Cass - Clarke - Crawford - Dallas - Decatur - Guthrie - Lucas - Madison - Monona - Monroe - Shelby - Warren - Wayne