At the Michigan Geological Repository for Research and Education at Western ... You can also view scans of our thin sections on-line by clicking on the URL links in the far right column of this ...

Just how old is Michigan? Michigan has a long geologic history. The oldest rocks in the state are over 3.5 billion years old. The older rocks in the state host important deposits of iron and copper.

In January, geologists with the U.S. Geological Survey released a first-of-its-kind map of the most likely places to look for it across the nation. Michigan is a prime candidate. In 1987 ...