Sentences with phrase «shallow seas now»

«The discovery of past land and shallow seas now provides an explanation.

Not exact matches

The new find helps shed light on the evolution of beaked whales as well as their competition: Soon after M. gregarius swam the region's seas, dolphins appeared on the scene, and their success in shallow coastal waters (where they now dominate), may have driven ziphiids to abandon foraging in surface waters.

Harpel's discovery made it possible for them to pinpoint the Mount Laurel Formation, which was deposited below a shallow sea, in which sharks and now - extinct marine reptiles called mosasaurs also swam, about 75 million years ago.

Some 150 million years ago in what is now Northern Bavaria, Archaeopteryx — the oldest bird species yet discovered — inhabited a subtropical environment characterized by reef islands and lagoons set in a shallow sea that was part of the primordial Mediterranean.

In a road cut near the Missouri River in central South Dakota, paleontologists uncovered signs of a fight to the death waged 73 million years ago in a shallow sea that covered much of what is now the Great Plains.

Some of the shallow - water seeps are likely to be in now - submerged areas that were methane - producing wetlands during the most recent ice age, when sea levels were more than 100 metres lower than they are today.

Mild oxygen levels in shallow seas but oxygen - poor deep oceans lasted for some 1.3 billion years during a time that has been dubbed the «Boring Billion» but eventually led to the development of mitochondria that now power multicellular planet and animal life (Nick Lane, New Scientist, February 10, 2010; Rachel Ehrenberg, Science News, September 29, 2009; Johnston et al, 2009; and H.D. Holland, 2006).

One could see these differences of sea level going either way — either the shallow hydrates were kept more stable than they are now, or perhaps they actually did get released more than we have yet ascertained.

It came far earlier that was thought, but now the clathrate gun is firing and methane is erupting out of shallow arctic seas and the vast tundra.

Now come fears of a methane time bomb, part two, this one bursting from the sea floor of the shallow Arctic continental shelf.

Sea levels rose and flooded coastal areas to create what is now the seal's prime shallow - water habitat.