USGS - science for a changing world

Mineral Resources On-Line Spatial Data

Mineral Resources > Online Spatial Data > Geology > by state > Iowa

Prairie du Chien Formation

Sandy dolomite in upper postion; sandstone in middle portion; dolomite with oolitic and tripolitic chert in lower portion.
StateIowa
NamePrairie du Chien Formation
Geologic agePhanerozoic | Paleozoic | Ordovician-Early [Beekmantown]
Original map labelOpc
CommentsApprox thickness 650 ft
Primary rock typedolostone (dolomite)
Secondary rock typesandstone
Other rock typeschert
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Carbonate > Dolostone (Bed)
Minor
Sedimentary > Chemical > Chert (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 coverageAllamakee - Clayton - Winneshiek

Show this information as [XML]

AccessibilityFOIAPrivacyPolicies and Notices

Take Pride in America logoUSA.gov logoU.S. Department of the Interior | U.S. Geological Survey
URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=IAOpc;0
Page Contact Information: Peter Schweitzer