The algal breath of life
Article Abstract:
The finding of 2.1 billion-year-old Precambrian Grypania fossil algae extends the known existence of eukaryotes to 300 million years (Myr) earlier than previously thought and also casts doubt on current models of Precambrian oxygen evolution. Tsu-Ming Han and Bruce Runnegar unearthed the Grypania specimens in the banded iron formation (BIF) near Marquette, MI. The discovery that Grypania, an aerobic or oxygen-dependent organism, existed with the BIFs contradicts the theory that the BIFS were central to the oxygenation of the primitive atmosphere.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Models come in from the cold
Article Abstract:
Gondwanaland, the ancient continent comprising the modern southern continents, may have had lakes during the late Permian that were 2,000 km long and 500 km wide which had a moderating effect on the climate. Climate modellers who have claimed that the region had wild seasonal fluctuations have ignored the geologic evidence. The best evidence of what climate an area did have is the kind of flora and fauna that did survive there. The paleobotanical evidence available suggests a cool temperate climate.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Contribution of Late Permian palaeogeography in maintaining a temperate climate in Gondwana
Article Abstract:
Gondwanaland, the ancient continent comprising the modern southern continents, may have had lakes during the Late Permian that were 2,000 km long and 500 km wide which had a moderating effect on the climate. Climate modellers who have claimed that the region had wild seasonal fluctuations have ignored the geologic evidence. The best evidence of what climate an area did have is the kind of flora and fauna that did survive there. The paleobotanical evidence available suggests a cool temperate climate.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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