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.

Paleobotany, Algae, Fossil, Fossil algae, Precambrian Era

---

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.

---

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.

Similar abstracts:

• Abstracts: The variable effect of clouds on atmospheric absorption of solar radiation. Inside history on droplets
• Abstracts: Segmental and developmental regulation of a presumptive T-cell oncogene in the central nervous system. A tension-based theory of morphogenesis and compact wiring in the central nervous system
• Abstracts: Electrical bursting of islet beta cells. ATP and chloride conductance. No electrostatic sense in snakes
• Abstracts: Interference imaging of daily growth bands in massive corals. The big picture
• Abstracts: The potential to surprise. Hydrogen bonding in the benzene-ammonia dimer. Westhof's rule

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.