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About: Gunflint chert     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatGeologicFormationsOfTheUnitedStates, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:Abstraction100002137yago:Arrangement107938773yago:Formation108426461yago:Group100031264yago:WikicatGeologicFormationsOfCanadayago:WikicatGeologicFormationsOfTheUnitedStates New Facet based on Instances of this Class

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 Gunflint Chert is of paleontological significance, as it contains evidence of microbial life from the Paleoproterozoic. The Gunflint Chert is composed of biogenic stromatolites. At the time of its discovery in the 1950s, it was the earliest form of life discovered and described in scientific literature, as well as the earliest evidence for photosynthesis. 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 converted to jasper are found in Ontario. The banded ironstone formation consists of alternat