13:44

Michigan's Sinkholes | Interview w/ Ty Black

7:13

Michigan Geology | The Michigan Basin

43:36

How Geologists Discovered and Mapped a Great Seaway

27:44

Michigan: State Profile

12:29

Michigan's Billion-Year-Old Glowing Rocks | "Yooper" Stones

1:01:42

Fire, Water, and Ice Michigan's Geological Story by Dr. Danita Brandt

9:34

Michigan Rockhounding

21:51

À quoi ressemblait le monde il y a 15 000 ans ? Les paysages incroyables de la dernière glaciation