By Raymond R. Anderson One billion years ago, the Earth’s crust split across part of the North American continent. This tear or rift, known as the Midcontinent Rift System, extended for 950 miles from what is now Lake Superior to Oklahoma, and was on its way to becoming a full-fledged ocean when the process halted. […]
All News and Pages Related to "midcontinental rift"
FAQs
Have a question about Iowa geology? Here are some answers to frequently asked questions. Are there dinosaur fossils in Iowa? What are the fossils of Iowa? Are there any meteorites in Iowa? What are geodes and how do they form? What are those strange boulders in fields? What is the midcontinental rift? When did oceans […]
