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Manson Group, Crater Moat area; Manson Impact Structure

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Primary Lithology: sedimentary clast breccia with shaly matrix; clasts and blocks of Cretaceous shale and varied Paleozoic lithologies in silty-sandy clay matrix. Minor Lithologies: grains or clasts of Proterozoic “red clastics” (mudstone/siltstone), Proterozoic crystalline basement, devitrified melt grains. Maximum thickness unknown, may reach thicknesses to 10,000 ft (3000 m).
State Iowa
Name Manson Group, Crater Moat area; Manson Impact Structure
Geologic age Upper Cretaceous; upper Campanian
Lithologic constituents
Major
Sedimentary > Clastic > Sedimentary-breccia (Melange)sedimentary clast breccia with shaly matrix; clasts and blocks of Cretaceous shale and varied Paleozoic lithologies in silty-sandy clay matrix.
Sedimentary > Clastic > Mudstone > Shale (Melange)sedimentary clast breccia with shaly matrix; clasts and blocks of Cretaceous shale and varied Paleozoic lithologies in silty-sandy clay matrix; grains or clasts of Proterozoic “red clastics” (mudstone/siltstone)
Minor
Igneous > Plutonic (Melange)Proterozoic crystalline basement, devitrified melt grains
Comments Manson Impact Structure-middle zone
References

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.
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Counties Calhoun - Humboldt - Pocahontas - Webster