Learn about Earth's Devonian Period and prehistoric life. ... The fish showed other characteristics of terrestrial animals, including ribs, a neck, and nostrils on its snout for breathing air.

Because it's a crucial animal, it's a crucial period, and it's an area of study that nobody's looked at before. You begin thinking, Wow, this is going to be the start of something big.

After the Devonian extinction ended, around 360 million years ago, Romer’s gap began. This void in the fossil record, named for Harvard professor Alfred Sherwood Romer, puzzled scientists for decades.

About 380 million years ago, late in the Devonian Period, ... Its skull alone was 4 feet long -- the entire animal was 20 feet long and probably weighed more than a ton.

Extended periods of marine anoxia — a lack of oxygen in the water — characterized the Late Devonian Mass Extinction. The two most pronounced periods are known as the Kellwasser event, which occurred ...

Melvyn Bragg and guests discuss the devastating mass extinctions of the Late Devonian Period, roughly 370 million years ago, when around 70 percent of species disappeared. Scientists are still ...