Duncan Lunan continues his exploration of Comets
Changes since the end of the Ordovician: red = extinction rate in time bins; green = the greatest magnitude of change in temperature in each bin; blue- the greatest rate of temperature change in each bin. Grey bars show mass extinctions (Credit: Song et al., Fig 1)
“The authors suggest that the oxygen depletion stemmed from extreme global warming, which, in turn, encouraged methane production by other ocean-floor bacteria and, in a roundabout way, other chemical reactions that consumed free dissolved oxygen. “
Millions of years ago a series of massive volcanic eruptions in the Wrangellia Province of western Canada, blasted out huge volumes of volcanic basalt.
“The Late Devonian is generally accepted to be one of the ‘Big Five’ mass extinction events”
“This is a happy story where we discovered a snail that is still around.” Norine Yeung