Sentences with phrase «areas of the ancient ocean»

But he cautions that the rapid increase in the extent of worms» burrowing modeled in the new study may have been limited to some areas of the ancient ocean and has yet to be shown to be a global phenomenon.

This research not only provides the first clear evidence that microorganisms were directly involved in the deposition of Earth's oldest iron formations; it also indicates that large populations of oxygen - producing cyanobacteria were at work in the shallow areas of the ancient oceans, while deeper water still reached by the light (the photic zone) tended to be populated by anoxyenic or micro-aerophilic iron - oxidizing bacteria which formed the iron deposits.