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Chisholm, Minnesota 55719

(Photos)

Glen Mine (old iron mine pit in Chisholm, Mesabi Iron Range, Minnesota, USA) 2

Jaspilite banded iron formation (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Glen Mine, Chisholm, Minnesota, USA)

Pyrite on quartz 1

Pyrite on quartz 2

Pyrite on quartz 3

Gypsum ("fishtail selenite")

Taconite (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; Mesabi Iron Range, Minnesota, USA) 2

Stromatolitic ferruginous chert ("Mary Ellen Jasper") (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Biwabik, Mesabi Iron Range, Minnesota, USA) 1

Stromatolitic ferruginous chert ("Mary Ellen Jasper") (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Biwabik, Mesabi Iron Range, Minnesota, USA) 2

Stromatolitic ferruginous chert ("Mary Ellen Jasper") (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Biwabik, Mesabi Iron Range, Minnesota, USA) 3

Binghamite (Cuyuna North Range, Minnesota, USA) 1

Binghamite (Cuyuna North Range, Minnesota, USA) 2

Binghamite (Cuyuna North Range, Minnesota, USA) 3

Binghamite (Cuyuna North Range, Minnesota, USA) 4

Binghamite (Cuyuna North Range, Minnesota, USA) 5

Agate nodule ("Lake Superior Agate") 1

Agate nodule ("Lake Superior Agate") 2

Migmatite (Archean, ~3.4 to 3.5 Ga; Minnesota, USA) 1

Migmatite (Archean, ~3.4 to 3.5 Ga; Minnesota, USA) 2

Migmatite (Archean, ~3.4 to 3.5 Ga; Minnesota, USA) 3

Migmatite (Archean, ~3.4 to 3.5 Ga; Minnesota, USA) 4

Quartzose sandstone (Hinckley Sandstone, Neoproterozoic; Hinckley, Minnesota, USA)

Carnotite in sandstone (Montrose County, Colorado, USA) 1

Carnotite in sandstone (Montrose County, Colorado, USA) 3

Mudcracks in gray shale

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