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. … See more The Gunflint Iron Formation is a banded iron formation, composed predominantly of dense chert and slate layers interbedded with ankerite carbonate layers. The chert layers can be subdivided into black layers (containing organic … See more The most abundant organisms in Gunflint are filaments found in stromatolitic fabrics, and typically range from 0.5-6.0 μm in diameter and up to several hundred microns in length. The Gunflint microfauna can be split into two broad categories: filaments and See more Spheroidal spore-like bodies within the Gunflint Chert are found irregularly distributed throughout the Gunflint Iron Formation, and range from 1 to 16 μm in diameter. The spheroidal bodies range from spherical to ellipsoidal in morphology. They are typically … See more Geologist Stanley A. Tyler first examined the Gunflint Range in 1953 and observed red iron banded formations and black chert, noting probable stromatolites, though he would … See more The Gunflint chert microfauna is mid- to late-Paleoproterozoic in age (approximately 1.878 Ga ± 1.3 Ma, as determined by See more Filamentous microorganisms within the Gunflint Chert represent a mixed population of photosynthetic cyanobacteria and iron oxidizing bacteria. On the outcrop scale, the filamentous … See more Various predominant taphonomic models have been suggested as mechanisms for the exceptional preservation of the Gunflint Chert See more WebLa permineralització és un procés de fossilització en el qual els dipòsits de mineral formen empremtes internes d'organismes. Portats per l'aigua, aquests minerals omplen els espais entre els teixits orgànics. A causa de la naturalesa de les empremtes formades, la permineralització és particularment útil en els estudis de les ...

Gunflint Microbiota SpringerLink

WebSignificance of the Gunflint (Precambrian) Microflora: Photosynthetic oxygen may have had important local effects before becoming a major ... P.M., UNMETAMORPHOSED MINERALS IN THE GUNFLINT FORMATION USED TO TEST THE AGE OF THE ANIMIKIE, JOURNAL OF GEOLOGY 70: 489 (1962). Google Scholar. JAMES, H.L., … WebDec 13, 2024 · The Late Proterozoic Gunflint Formation 2002). The microfossil assemblage of the Gunflint Formation is renowned among astrobiologists for its excellent preservation in stromatolitic and non-stromatolitic cherts and for its abundance and diversity of filamentous, coccoidal fossils and problematic forms that are reported only in iron … smith\u0027s nellis and stewart

Gunflint Formation SpringerLink

WebAug 20, 2024 · However, the former passage of fluid hydrocarbons rarely leaves a trace, so evidence for this process in the early Precambrian rock record is sparse. Here, we report the widespread presence of... WebSep 15, 2024 · The Gunflint Formation is a part of the Paleoproterozoic Animikie Group, which lies in the Lake Superior region of Canada and the USA. The group extends northeastward from the Mesabi Range in north-central Minnesota to the Gunflint Range in Ontario, Canada. WebMar 23, 2024 · The stratigraphic association of Gunflint-type microfossils and Palaeoproterozoic iron formation suggests that these fossils may record communities involved in iron metabolism or oxygen... riverhounds stadium pittsburgh