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Metabasalt

Dark-green amphibolite, actinolite schist, and greenstone. Interflow units consists of graphitic schist, chert, and carbonate- and silicate-facies iron-formation. Thickness of individual flows 50-400 ft (244-1,524 m).
StateSouth Dakota
NameMetabasalt
Geologic ageProterozoic | Paleoproterozoic
Original map labelXb1
Primary rock typeamphibolite
Secondary rock typeschist
Other rock typesgreenstone; chert; iron formation
Lithologic constituents
Major
Metamorphic > Metaigneous > Greenstone
Metamorphic > Schist
Metamorphic > Amphibolite
Minor
Sedimentary > Chemical > Banded-iron-formation (Bed)
Sedimentary > Chemical > Chert
Map references
Martin, J. E., Sawyer, J. F., Fahrenbach, M. D., Tomhave, D. W., and Schulz, L. D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey
Unit references
Martin, J. E., Sawyer, J. F., Fahrenbach, M. D., Tomhave, D. W., and Schulz, L. D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey
Geographic coverageCuster - Lawrence - Pennington

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