Gunflint chert - Wikipedia
The Gunflint chert (1.88 Ga [1]) 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. [2]
(PDF) Gunflint chert formation - ResearchGate
Jan 26, 2021 · Preservational windows in the 1.88-Ga Gunflint chert allow us to posit novel cellular forms, and emphasize the critical role played by the fossil record in understanding early biodiversity.
Acritarch-like Microorganisms from the 1.9 Ga Gunflint Chert, …
Location map of the Gunflint Chert. (A) Map of the northern Lake Superior region showing the Proterozoic Mesabi, Vermillion, and Gunflint iron ranges.
Stable isotope geochemistry of cherts and carbonates from the 2.0 …
Dec 1, 1992 · Petrographic observations of each of the three chert types in the Gunflint suggest that silica precipitated directly as both quartz chert and as a hydrous (i.e., opaline) silica precur- sor which then converted to quartz chert dur- ing early diagenesis.
Acritarch-like Microorganisms from the 1.9 Ga Gunflint Chert, …
Apr 18, 2022 · Location map of the Gunflint Chert. (A) Map of the northern Lake Superior region showing the Proterozoic
The Gunflint microbiota - ScienceDirect
Aug 1, 1977 · SIGNIFICANCE OF THE GUNFLINT MICROBIOTA The microbiota found in the cherts of the Gunflint Iron Formation, un- like other ancient microbiotas described, is unique in preserving a variety of odd and complex morphotypes of unknown taxonomic affinities (Table II).
Gunflint Chert - chemeurope.com
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 western Ontario along the north shore of Lake Superior. The black layers in the sequence contain microfossils that are 1.9 to …
| Volumetric isotope distribution maps from the Gunflint chert ...
Figure 2A shows the distribution of the 12 C signal acquired from the Gunflint chert sample. The map reveals a high degree of co-occurrence between 12 C intensities and the distribution of...
Map showing general areal geology of the Gunflint range north of Lake Superior. Note above N on directional arrow the isolated eastern outlier of the Gunflint formation.
Gunflint Range - Wikipedia
The Gunflint Range is an iron ore deposit in northern Minnesota in the United States and Northwestern Ontario, Canada. The range extends from the extreme northern portion of Cook County, Minnesota into the Thunder Bay District, Ontario. The Gunflint Iron Formation is a continuation of the Mesabi Range to the southwest.