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- Gunflint_chert abstract "The Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern Ontario along the north shore of Lake Superior. The black layers in the sequence contain microfossils that are 1.9 to 2.3 billion years in age. Stromatolite colonies of cyanobacteria that have been converted to jasper are found in Ontario. The banded ironstone formation consists of alternating strata of iron oxide-rich layers interbedded with silica-rich zones. The iron oxides are typically hematite or magnetite with ilmenite, while the silicates are predominantly cryptocrystalline quartz as chert or jasper, along with some minor silicate minerals.Stanley A. Tyler examined the area in 1953, and noted the red-colored stromatolites. He also sampled a jet-black chert layer which, when observed petrographically, revealed some lifelike small spheres, rods and filaments less than 10 micrometres in size. Elso Barghoorn, a paleobotanist at Harvard, subsequently looked at these same samples. Barghoorn concluded that \"they were indeed structurally preserved unicellular organisms.\" In 1965, the two scientists published their finding, and named a variety of the Gunflint flora. This created an academic \"stampede\" to explore Precambrian microfossils from similar Proterozoic environments.".
- Gunflint_chert wikiPageExternalLink k26.htm.
- Gunflint_chert wikiPageID "2545432".
- Gunflint_chert wikiPageLength "2619".
- Gunflint_chert wikiPageOutDegree "39".
- Gunflint_chert wikiPageRevisionID "706338170".
- Gunflint_chert wikiPageWikiLink Animikie_Group.
- Gunflint_chert wikiPageWikiLink Banded_iron_formation.
- Gunflint_chert wikiPageWikiLink Category:Chert.
- Gunflint_chert wikiPageWikiLink Category:Geologic_formations_of_Canada.
- Gunflint_chert wikiPageWikiLink Category:Geologic_formations_of_Minnesota.
- Gunflint_chert wikiPageWikiLink Category:Paleontological_sites_of_North_America.
- Gunflint_chert wikiPageWikiLink Category:Paleontology_in_Canada.
- Gunflint_chert wikiPageWikiLink Category:Paleontology_in_Minnesota.
- Gunflint_chert wikiPageWikiLink Chert.
- Gunflint_chert wikiPageWikiLink Colony_(biology).
- Gunflint_chert wikiPageWikiLink Cryptocrystalline.
- Gunflint_chert wikiPageWikiLink Cyanobacteria.
- Gunflint_chert wikiPageWikiLink Elso_Sterrenberg_Barghoorn.
- Gunflint_chert wikiPageWikiLink Great_Oxygenation_Event.
- Gunflint_chert wikiPageWikiLink Gunflint_Range.
- Gunflint_chert wikiPageWikiLink Harvard_University.
- Gunflint_chert wikiPageWikiLink Hematite.
- Gunflint_chert wikiPageWikiLink Ilmenite.
- Gunflint_chert wikiPageWikiLink Iron_oxide.
- Gunflint_chert wikiPageWikiLink Ironstone.
- Gunflint_chert wikiPageWikiLink Jasper.
- Gunflint_chert wikiPageWikiLink Lake_Superior.
- Gunflint_chert wikiPageWikiLink Magnetite.
- Gunflint_chert wikiPageWikiLink Microorganism.
- Gunflint_chert wikiPageWikiLink Micropaleontology.
- Gunflint_chert wikiPageWikiLink Minnesota.
- Gunflint_chert wikiPageWikiLink Northwestern_Ontario.
- Gunflint_chert wikiPageWikiLink Petrography.
- Gunflint_chert wikiPageWikiLink Precambrian.
- Gunflint_chert wikiPageWikiLink Proterozoic.
- Gunflint_chert wikiPageWikiLink Quartz.
- Gunflint_chert wikiPageWikiLink Silicon_dioxide.
- Gunflint_chert wikiPageWikiLink Stanley_A._Tyler.
- Gunflint_chert wikiPageWikiLink Stratum.
- Gunflint_chert wikiPageWikiLink Stromatolite.
- Gunflint_chert wikiPageWikiLink Unicellular_organism.
- Gunflint_chert wikiPageWikiLink Year.
- Gunflint_chert wikiPageWikiLinkText "Gunflint chert".
- Gunflint_chert wikiPageWikiLinkText "gunflint chert".
- Gunflint_chert subject Category:Chert.
- Gunflint_chert subject Category:Geologic_formations_of_Canada.
- Gunflint_chert subject Category:Geologic_formations_of_Minnesota.
- Gunflint_chert subject Category:Paleontological_sites_of_North_America.
- Gunflint_chert subject Category:Paleontology_in_Canada.
- Gunflint_chert subject Category:Paleontology_in_Minnesota.
- Gunflint_chert hypernym Sequence.
- Gunflint_chert type Formation.
- Gunflint_chert type Landform.
- Gunflint_chert type Redirect.
- Gunflint_chert type Site.
- Gunflint_chert comment "The Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern Ontario along the north shore of Lake Superior. The black layers in the sequence contain microfossils that are 1.9 to 2.3 billion years in age. Stromatolite colonies of cyanobacteria that have been converted to jasper are found in Ontario.".
- Gunflint_chert label "Gunflint chert".
- Gunflint_chert sameAs Q11973265.
- Gunflint_chert sameAs Gunflint_Chert.
- Gunflint_chert sameAs m.07m53c.
- Gunflint_chert sameAs Q11973265.
- Gunflint_chert wasDerivedFrom Gunflint_chert?oldid=706338170.
- Gunflint_chert isPrimaryTopicOf Gunflint_chert.