revealed a significant rise in marine oxygenation during the Late Paleozoic era (400 million ... evidence indicating the oxygenation of the ocean at the same time, support the hypothesis that ...

The Late Paleozoic ice age has long been a climate enigma. Atmospheric CO₂ estimates for this period vary widely, and different reconstructions of the likely temperature vary by as much as 20°C.

The Devonian, part of the Paleozoic era, is otherwise known as the Age of Fishes, as it spawned a remarkable variety of fish. The most formidable of them were the armored placoderms, a group that ...