Geological History Lessons

Geological History Lessons of Northern Michigan in Petoskey Stone
Petoskey Stone

One of my favorite places on Earth is northern Michigan. As a child, I spent many summers on Lake Michigammi in the upper peninsula and grew to love the land of birches and pines. We can learn from the geological history lessons of northern Michigan.

Returning to this area over 70 years later has been a shock. When I was a kid, the people made a living harvesting and using the trees to make wood for construction purposes and to make paper. That industry still exists, but tourism and the construction of elaborate homes have replaced the trees as the basis of the northern Michigan economy. People have been buying large plots of land, building huge houses, and calling their property a “forest preserve.” Unfortunately, this practice includes the shoreline of Lake Michigan, Lake Huron, and the many inland lakes, limiting the general public’s access to this water wonderland.

Michigan’s state rock is the Petoskey stone, a beautiful coral often used to make attractive jewelry. The interesting thing about the Petoskey stone is that it is a tropical coral that only grows in warm water. Obviously, there has been a change in the climate because Michigan is not a tropical paradise. In our time of concern about climate change, we find the geological history lessons of northern Michigan indicating that Earth’s climate has changed in the past.

Another lesson from northern Michigan is the action of ice over time. Everywhere you look, you see huge rocks weighing many tons that could not have been placed by running water. These rocks come from many places and are all different. As a public school earth science teacher in South Bend, Indiana, I would take my students to the local gravel pit to hunt for unusual rocks. One student found a jasper conglomerate from Bruce Mines in Ontario. It had glacial groves and was hundreds of miles from its origin. We also found pieces of raw copper from outcrops in northern Michigan. One student found a diamond from an unknown Klondike area somewhere to the north. The geological history lessons we learn from the enormous rocks, the sand, and the many lakes is that, at one time, glaciers covered the area.

So how much time did these climate changes take? Knowing the geological history has been essential for oil drilling, coal and copper mining, and agriculture in Michigan. These things were part of how God prepared planet Earth for human habitation. Some religious people have tried to explain these things by Noah’s flood, but most ignore any attempt to explain the method and just say, “God did it.” That avoids the question of how and when.

Genesis 1:1 is undated and untimed, and the Genesis account uses the Hebrew words “bara,” meaning to create, and “asah,” meaning to make. Creating from nothing (bara) is used in verse 1, where it applies to space, time, and matter/energy. It is used again in verse 21 for the creation of the first life and in verse 27 for the creation of the first humans. Making (asah) refers to taking what was created and changing it. It is used in verses 7, 16, and 25. Chapter 2 verse 3 summarizes what God had done by using both bara and asah.

The geological history lessons of northern Michigan show us God taking what He had created and molding the Earth to prepare it for human habitation. As we understand more of what God has done, it becomes evident that all we see around us is the work of an intelligent Creator who cares about His creation and the humans He created in His image.

— John N. Clayton © 2023

Petoskey Stone Dilemma

Petoskey Stone TilesEvery part of the United States has rocks, plants, and animals that are unique to that area. Certain plants grow in abundance in various locations. In Arizona the saguaro cactus is abundant. California is home for giant redwood trees. Indiana has tulip trees. Many states have adopted an official flower, tree, bird, fossil, or rock. In Michigan, since 1965 our state rock has been the Petoskey stone.

The name comes from the city of Petoskey which got its name from an Ottawa Indian legend. Thanks to the glaciers that swept down from the north scooping up rocks and depositing them, Petoskey stones are found all over the state. When I took my earth science students to the local gravel pit, we would discover Petoskey stones mixed in with the gravel. A local jeweler would show the kids how beautiful jewelry could be made from those stones.

The Petoskey stone is a petrified tropical coral with the scientific name Hexagonaria, meaning six-sided chamber. The picture shows some tiles made from Petoskey stones, and you can see that each polyp has six sides. Mixed in with them are clams, crinoids, trilobites, fish, and cephalopods. Studies of the Petoskey stone show the coral lived on plankton which are microscopic life forms that live in warm oceans. Petoskey, Michigan is NOT a tropical paradise and the Devonian period when these life forms lived lasted a long time, so the Devonian reefs are very thick. The whole state of Michigan is a bowl with these fossils found all around the state. In the middle of the bowl are coal, oil, peat, sulfur and natural gas deposits. The dilemma is how these rock formations got to be the way they are and where they are.

Some religious folks might suggest that this is a deposit produced by the flood of Noah. The problem with that explanation is that this is not a flood deposit and is not a product of violence. Genesis 7:11 tells us that “all the fountains of the great deep were broken up and the windows of heaven were opened.” I would take my students on a field trip to the Shedd Aquarium in Chicago to see a reef display. The rocks being formed and making up the reef are identical to the ones we see in the Devonian deposit. The fossils don’t show a violent end, but instead, they show a slow, gentle formation process. Calcite, silica and other minerals have replaced the original material in the cells of the Petoskey stone animals, giving a dazzling array of colors.

When God created “the heaven and the earth” (Genesis 1:1), the Bible simply states that He did it – not how He did it. At the end of verse 1, there were Petoskey stones in Devonian reefs, and oil, gas, coal, and the other resources were being formed. A change was coming that would make the conditions of the Earth more hospitable for human life, and God knew what we would need for an advanced civilization. Having a warm ocean covering the entire state of Michigan was not an environment humans could thrive in, but it was a tool God used to prepare the resources for human life.

There is no dilemma if we take the Bible literally and accept only what it says. Locking the creation account into a denominational theological tradition does violence to the Genesis account and causes young people to question the truth of the Bible. On the other hand, as they admire the beauty of the Petoskey stone jewelry they have made, people can realize that God has done some special and beautiful things to prepare a home for us in this life.
— John N. Clayton © 2019

For more on taking Genesis literally, read “God’s Revelation in His Rocks and His Word” available free on doesgodexist.org.