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...

2021. Gunflint chert Archived 2005-06-12 at the Wayback Machine Biogenicity of Microfossils in the Apex Chert "Portion Of Ancient Australian Chert Microstructures...

Stromatolite structures are evident within the Gunflint Iron Formation. The cherts of the Gunflint (the Gunflint Chert) are noted for containing Precambrian microfossils...

oxygen-using organisms. It is also one of the most common fossils in the Gunflint chert. Palmer, Douglas; et al. (2009). Prehistoric Life: The Definitive Visual...

microorganism. Kakabekia umbellata was first found in the 1.88 billion year old Gunflint Chert, and in 1966, a living member of the genus, Kakabekia barghoorniana...

million years ago. The Gunflint Range consists of a basal conglomerate, then the Gunflint Iron formation and the Gunflint Chert with the Rove Formation...

lakes formed. The Ojibwa and French explorers found chert, which produces sparks, at Gunflint Lake and gave the trail its name. In contemporary times...

microfossils reveals differential heterotrophic consumption in the ~1.9-Ga Gunflint chert PNAS 110 (20) 8020-8024 doi:10.1073/pnas.1221965110 Raiswell, R. (1997)...

million years old, Diskagma was larger than coeval marine microbes of the Gunflint Chert, and more complex than stromatolites. Retallack, G.J.; Krull, E.S.;...

microfossils reveals differential heterotrophic consumption in the ~1.9-Ga Gunflint chert PNAS 110 (20) 8020-8024 doi:10.1073/pnas.1221965110 Raiswell, R. (1997)...

carbon-14 dating. 1953 — Stanley A. Tyler discovers microfossils in the gunflint chert formation of cyanobacteria that created pre-Cambrian stromatolites approximately...

Ancient microfossils have been found in the banded iron formations of the Gunflint Chert. The Boundary Waters area is near the border of the true boreal forest...

Canals from 1892 to 1905. The town is near the main exposure of the Gunflint chert, which contains rare single-celled Proterozoic fossils. Passing close...

cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely...

Gabon produced by uranium-precipitant bacteria. c. 1,900–,880 Ma – Gunflint chert biota forms flourishes including prokaryotes like Kakabekia, Gunflintia...

Schreiber, Ontario Gunflint Chert Late Archaean – Early Proterozoic North America Canada: western Ontario & US: Minnesota (Gunflint Range) Stromatolite...

1 billion-year-old cyanobacteria and fungi-like microflora at their Gunflint Chert fossil site. Eleven years later, Barghoorn and J. William Schopf reported...

considered to be robust, extend on Earth to the 1.9-billion-year-old Gunflint Chert; they may include the four-billion-year-old Martian meteorite ALH84001...

less certain reports of magnetofossils extend to 1.9 billion years old Gunflint chert. There have also been claims of their existence on Mars based on the...

less certain reports of magnetofossils extend to 1.9 billion years old Gunflint Chert. Some marine prokaryotes possess gas vacuoles. Gas vacuole are nanocompartments...

and contains significant deposits of iron ore. Together with the Mesabi, Gunflint, and Cuyuna ranges, these four constitute the Iron Ranges of northern Minnesota...

Knapped stone tools are made from cryptocrystalline materials such as chert, flint, radiolarite, chalcedony, obsidian, basalt, and quartzite via a splitting...

Barghoorn, Elso S.; Tyler, Stanley A. (1965). "Microorganisms from the Gunflint Chert". Science. 147 (3658): 563–575. Bibcode:1965Sci...147..563B. doi:10...

August 2015. Austin, Robert (2011). "Gunflints from Fort Brooke: A Study and Some Hypotheses Regarding Gunflint Procurement". Florida Anthropoligist....

sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert. They can be up to several hundred meters in thickness and extend laterally...

Devonian fossil assemblage from the Rhynie chert. These early plants were preserved by being petrified in chert formed in silica-rich volcanic hot springs...

Clear Creek Chert Clear Creek Formation Pragian New Harmony Group Backbone Limestone Hunton Megagroup Backbone Limestone Grassy Knob Chert Bailey Limestone...

Manganese, Minnesota Mesabi Range Gogebic Range Vermilion Range (Minnesota) Gunflint Range Marquette Iron Range Banded iron formation Schmidt, Robert (1963)...

Lower South-East of South Australia. Banded iron formation Cotham Marble Gunflint Range Laguna Negra, Catamarca Microbially induced sedimentary structure...

Clear Creek Chert Clear Creek Formation Pragian New Harmony Group Backbone Limestone Hunton Megagroup Backbone Limestone Grassy Knob Chert Bailey Limestone...