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- Animikie_Group abstract "The Animikie Group is a geologic group composed of sedimentary and metasedimentary rock, having been originally deposited between 2,500 and 1,800 million years ago within the Animikie Basin. This group of formations is geographically divided into the Gunflint Range, the Mesabi and Vermilion ranges, and the Cuyuna Range. On the map, the Animikie Group is the dark gray northeast-trending belt which ranges from south-central Minnesota, U.S., up to Thunder Bay, Ontario, Canada. The Gunflint Iron Range is the linear black formation labeled G, the Mesabi Iron Range is the jagged black linear formation labeled F, and Cuyuna Iron Range is the two black spots labeled E. The gabbro of the Duluth Complex, intruded during the formation of the Midcontinent Rift, separates the Mesabi and Gunflint iron ranges; it is shown by the speckled area wrapping around the western end of Lake Superior.Banded-iron formations are iron formations which formed about 2,000 million years ago and were first described in the Lake Superior region. Sediments associated with the last stage of the Great Lakes tectonic zone contain banded-iron formations. These sediments were deposited for two hundred million years and extend intermittently along roughly the same trend as the Great Lakes tectonic zone, from Minnesota into eastern Ontario, Canada, and through upper Wisconsin and Michigan. They are characterized by bands of iron compounds and chert. Enough oxygen had accumulated in seawater so that dissolved iron was oxidized; iron reacts with oxygen to form compounds that precipitate out – including hematite, limonite and siderite. These iron compounds precipitated from the seawater in varying proportions with chert, producing banded-iron formations. These iron formations are abundant in the Lake Superior region. The Sudbury Impact event occurred 1,850 million years ago; it is theorized that this caused the end of the banded-iron deposits. The results of the impact affected concentrations of dissolved oxygen in the sea; the accumulation of banded-iron formations suddenly ended 1,850 million years ago.The Gunflint Range consists of a basal conglomerate, then the Gunflint Iron formation and the Gunflint Chert with the Rove Formation deposited on top. The Mesabi Range consists of the basal Pokegama Quartzite layer, then the Biwabik Iron Formation with the Virginia Formation deposited on top. The Vermilion Range consists of the basal Ely Greenstone, then the Soudan Iron formation with various granites on top. The Cuyuna Range consists of the basal North Range group, then the Trommald Formation with the Thomson Formation deposited on top.".
- Animikie_Group thumbnail Animikie_Group,_Marquette_Range_and_Huronian_supergroups2.PNG?width=300.
- Animikie_Group wikiPageID "26982485".
- Animikie_Group wikiPageRevisionID "606727032".
- Animikie_Group hasPhotoCollection Animikie_Group.
- Animikie_Group subject Category:Geography_of_Thunder_Bay_District.
- Animikie_Group subject Category:Geologic_formations_of_the_United_States.
- Animikie_Group subject Category:Geological_groups.
- Animikie_Group subject Category:Geological_history_of_Earth.
- Animikie_Group subject Category:Geology_of_Minnesota.
- Animikie_Group subject Category:Geology_of_Ontario.
- Animikie_Group subject Category:Iron_mines_in_the_United_States.
- Animikie_Group subject Category:Mining_in_Minnesota.
- Animikie_Group subject Category:Minnesota_maps.
- Animikie_Group subject Category:Mountain_ranges_of_Minnesota.
- Animikie_Group subject Category:Mountain_ranges_of_Ontario.
- Animikie_Group subject Category:Ore_deposits.
- Animikie_Group subject Category:Regions_of_Minnesota.
- Animikie_Group subject Category:Rock_formations_in_Minnesota.
- Animikie_Group subject Category:Stratigraphy_of_Ontario.
- Animikie_Group type Artifact100021939.
- Animikie_Group type Excavation103302121.
- Animikie_Group type GeologicalFormation109287968.
- Animikie_Group type IronMinesInTheUnitedStates.
- Animikie_Group type Location100027167.
- Animikie_Group type Mine103768346.
- Animikie_Group type MountainRangesOfMinnesota.
- Animikie_Group type MountainRangesOfOntario.
- Animikie_Group type Object100002684.
- Animikie_Group type PhysicalEntity100001930.
- Animikie_Group type Range109403734.
- Animikie_Group type Region108630039.
- Animikie_Group type RegionsOfMinnesota.
- Animikie_Group type Whole100003553.
- Animikie_Group type YagoGeoEntity.
- Animikie_Group type YagoLegalActorGeo.
- Animikie_Group type YagoPermanentlyLocatedEntity.
- Animikie_Group comment "The Animikie Group is a geologic group composed of sedimentary and metasedimentary rock, having been originally deposited between 2,500 and 1,800 million years ago within the Animikie Basin. This group of formations is geographically divided into the Gunflint Range, the Mesabi and Vermilion ranges, and the Cuyuna Range. On the map, the Animikie Group is the dark gray northeast-trending belt which ranges from south-central Minnesota, U.S., up to Thunder Bay, Ontario, Canada.".
- Animikie_Group label "Animikie Group".
- Animikie_Group sameAs m.0c01n4c.
- Animikie_Group sameAs Q4765191.
- Animikie_Group sameAs Q4765191.
- Animikie_Group sameAs Animikie_Group.
- Animikie_Group wasDerivedFrom Animikie_Group?oldid=606727032.
- Animikie_Group depiction Animikie_Group,_Marquette_Range_and_Huronian_supergroups2.PNG.
- Animikie_Group isPrimaryTopicOf Animikie_Group.