Geologic Map of Michigan

Figure 9. Michigan Geologic Map

This is a link to a .pdf file that will open using Adobe Reader or another .pdf-reading program.

Questions

5. How old is the green rock unit labeled Ju?

• Upper Devonian
• Upper Jurassic
• Upper Mississippian
• Upper Cambrian

6. How old is the brown rock unit labeled Du?

• Upper Devonian
• Upper Jurassic
• Upper Mississippian
• Upper Cambrian

7. Based upon your answers above, which geologic structure underlies the Lower Peninsula of Michigan?
Hint: Review Domes and Basins and check out the geologic cross-section B-B’ on the map.

• dome
• basin

Michigan is part of the stable interior portion of the North American Continent, but it was possibly affected by plate tectonic forces to the east.  To read more about the possible origin of the geologic structure of Michigan, check out this poster, the wikipedia page and this blog post.