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- W2096024712 abstract "The Middle Precambrian problematical microorganism Eosphaera Barghoorn and Eosphaera-like structures known from Early and Middle Precambrian banded iron formations have been compared with the recently discovered Devonian volvocacean alga Eovolvox Kaźmierczak and some modern colonial Volvocales. The volvocacean interpretation of Eosphaera implies that algal eukaryotes (green phytoflagellates) werc already prewmt in the earth biosphere before at least 1.9 b. y. ago (Gunflint Iron Formaticn), and probably before 2.7 b. y. ago (Soudan Iron Formation). The type of metabolism and thc oxygen requirements of modern colonial Volvocales indicate that Eosphaera was most probably a photoorgano-trophic (mixotrophic) organism able to live in the extremely oxygen-deficicnt or anoxy-genous Early Precambrian environment. As an oxygen-releasing photosynthesizer, Eosphaera could have played a considerable role in the production of free oxygen during the Precambrian. The abundance of Eospkaera-like ferriferous structures in the iron microbands of many banded iron formations implies active participation of these organisns in the formation of Precambrian sedimentary iron ores. The exclusively fresh-water habitat of extant volvocacean algae suggests that the Procambrian environments inhabited by Eosphaera were non-marine." @default.
- W2096024712 created "2016-06-24" @default.
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- W2096024712 date "1976-01-01" @default.
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- W2096024712 title "Devonian and modern relatives of the Precambrian <i>Eosphaera:</i> possible significance for the early eukaryotes" @default.
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- W2096024712 doi "https://doi.org/10.1111/j.1502-3931.1976.tb00949.x" @default.
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