Iron minerals within specific microfossil morphospecies of the 1.88 Ga Gunflint Formation

Iron minerals within specific microfossil morphospecies of the 1.88 Ga Gunflint Formation

Problematic microfossils dominate the palaeontological record between the Great Oxidation Event 2.4 billion years ago (Ga) and the last Palaeoproterozoic iron formations, deposited 500-600 million years later. These fossils are often associated with iron-rich sedimentary rocks, but their affinities, metabolism, and, hence, their contributions to Earth surface oxidation and Fe deposition remain ...

Microfossils and the Depositional Environment of the Gunflint Iron Formation

Fr Utexites from Stromatolites of the Gunflint Iron Formation of Canada, and Its Biological Affinities*

Walter, M.R. and Awramik, S.M., 1979. Frutexites from stromatolites of the Gunflint Iron Formation of Canada, and its biological affinities. Precambrian Res., 9: 23--33. The microfossil Frutexites is known from many Palaeozoic and some Proterozoic carbonate sedimentary rocks. We recently found unusually well-preserved examples in the early Proterozoic Gunflint Iron Formation of Ontario, Canada....

Geology of the Gunflint Iron Formation and the Sudbury Impact Layer, Northeastern Minnesota

Figure 1. Regional geologic map of northeastern Minnesota showing the location of Gunflint Trail (modified from Jirsa and Miller, 2005). Field trip area lies near the northwestern end of the trail at the junction of Neoarchean, Paleoproterozoic, and Mesoproterozoic terranes.

formation and evolution of regional organizations: the case study of the economic cooperation organization (eco)

abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...