The site has a layer of rock that contains well-preserved fossils. The animals typically found in that region lived in hostile environments with little oxygen. As iron pyrite filled the imprint ...

Because so little fossil ... the iron supply is exhausted, however, oxygen begins escaping the seas into the open air. Evidence of a buildup of atmospheric oxygen first appears in rock layers ...

Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time (Figure 4).

It’s a type of non-fossil fuel production of hydrogen from ... up of experiments and testing of the process on various iron-rich rock types found throughout North America. The team plans to ...