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Denham Formation

Denham Formation - Quartz arenite and siltstone, oxide iron-formation, marble, mafic hypabyssal intrusions and fragmental volcanic rocks metamorphosed to the staurolite grade of the amphibolite facies
StateMinnesota
NameDenham Formation
Geologic ageEarly Proterozoic
Original map labelPedq
Commentsin the Mille Lacs Group and related rocks of the Penokean fold-and-thrust belt
Primary rock typesandstone
Secondary rock typesiltstone
Other rock typesiron formation; marble; metavolcanic rock
Lithologic constituents
Major
Sedimentary > Clastic > Siltstone
Sedimentary > Clastic > Sandstone > Arenitequartz arenite
Minor
Metamorphic > Metaigneous > Metavolcanic
Metamorphic > Metasedimentary > Metacarbonate > Marble
Sedimentary > Chemical > Banded-iron-formation
Map references
Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm
Unit references
Morey, G.B., and Meints, Joyce, 2000, Geologic map of Minnesota - Bedrock Geology: Minnesota Geological Survey, State Map Series, S-20, 3rd edition, scale 1:1,000,000. available online at: http://www.geo.umn.edu/mgs/currentpubs.htm
Geographic coverageAitkin - Mille Lacs - Pine

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