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Douglas Group

Cyclic deposits with shale, siltstone and minor thin limestone beds; Lawrence Formation at top and Stranger Formation at base.
StateIowa
NameDouglas Group
Geologic agePhanerozoic | Paleozoic | Carboniferous Pennsylvanian-Late [Virgil]
Original map labelPd
CommentsApprox thickness 115 ft.
Primary rock typeshale
Secondary rock typesiltstone
Other rock typeslimestone
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Minor
Sedimentary > Carbonate > Limestone (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
Geographic coverageAdair - Adams - Cass - Fremont - Madison - Mills - Montgomery - Pottawattamie - Ringgold - Taylor - Union

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