Born in the fires of the Leland Lake Superior Iron Company ... to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind.” Michigan Rockhounds report ...

In a recent study, geologists say Michigan is home to the oldest known rock in the nation. Watersmeet gneiss is found in Michigan's Upper Peninsula. Minnesota's Morton gneiss previously held the ...

Huge iron ore ... oxides in the rock, which gave researchers the first ever direct age measurements for the Hamersley Province deposits. The measurements revealed the iron ore formed around ...