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Sioux Quartzite

Pink-colored fine grains of quartz sand cemented to non-porous quartzite of silica; contains some red slate; Rb-Sr dates > 1200 M.Y.
State Iowa
Name Sioux Quartzite
Geologic age Proterozoic | Mesoproterozoic
Primary rock type quartzite
Secondary rock type slate
Other rock types
Lithologic constituents
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
Counties Calhoun - Pocahontas