The world's primary economic source of iron ore, iron formations, are ancient sedimentary rocks that appear as solid as rocks can be. How did they get to be like that? According to researchers, it has ...

Though they may seem rock solid, the ancient sedimentary rocks called iron formations - the world's chief economic source of iron ore - were once dissolved in seawater. How did that iron go from a ...

Iron formations deposited in marine settings during the Precambrian represent large sinks of iron and silica, and have been used to reconstruct environmental conditions at the time of their formation.