What was the ocean's depth, salinity and temperature? To me, the most amazing thing about the Isle La Motte reef is the variety of creatures that lived in the shallow seas half a billion years ago ...

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 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 ...