A fun and educational journey, Under Michigan explores Earth's geological past, taking readers far below the familiar sights of Michigan and nearby places to explain the creation of minerals and fossils and show where they can be found in the varying layers of rock. Under Michigan is the first book for young readers about the geologic history of the state and the structure scientists call the Michigan Basin.
Within these layers of rock rest all sorts of ancient fossils and minerals that date back to the eras when tropical seas spread across Michigan and hot volcanoes flung molten rock into its skies-long before mile-thick glaciers bulldozed over Michigan and plowed through ancient river valleys to form the Great Lakes. Michigan rests on sedimentary rocks that reach down into the earth's crust more than fourteen thousand feet-a depth three-and-a-half times deeper than the Grand Canyon. Underneath the earth's surface, however, is equally distinctive evidence of an exciting history. Most people recognize Michigan by its mitten-shaped Lower Peninsula and the Great Lakes embracing the state.
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