Sioux Quartzite

Crops out in northwestern Lyon County; buried beneath Cretaceous strata to south and east. Primary lithology: quartzite, fine to coarse grained, pink, red, purple (low-grade metamorphic rock). Minor: conglomerate; claystone/argillite, red. Estimated thickness <500 ft (150 m).
State Iowa
Name Sioux Quartzite
Geologic age Lower Proterozoic
Lithologic constituents
Metamorphic > Metasedimentary > Metaclastic > Quartzitefine to coarse grained, pink, red, purple (low-grade metamorphic rock)
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Mudstone > Claystone (Bed)claystone/argillite, red

Witzke, Brian J., Anderson, Raymond R., and Pope, John P., 2010, Iowa Geological and Water Survey, DNR, Bedrock Geologic Map of Iowa, OFM-2010-1. Scale 1:500,000.

NGMDB product
Counties Lyon