What were the ancient mountains in Michigan known as?

The ancient mountains in Michigan are known as the Killarney Range. This range, which dates back over a billion years, was formed during a period of intense geological activity when the North American continent was still being shaped. It was located primarily in what is now Ontario, Canada, but its geological influence extends into northern Michigan.

The Killarney Range is notable for its ancient rock formations, including quartzite and granite, which are remnants of an era when tectonic forces were creating significant mountain ranges. While the rest of the options refer to well-known mountain ranges, they either do not pertain to Michigan or were formed in different geological periods or settings. The Appalachian Mountains, for instance, are much younger and primarily located along the eastern United States, while the Rocky Mountains are well-known for their dramatic peaks in the western states. The Ozark Hills, found in the central United States, also do not relate to Michigan's ancient geological past. Thus, the Killarney Range is uniquely significant as it directly links to the ancient geological history of the state.