Comments Subscribe to Personal Liberty News Feed Subscribe to Personal Liberty
 

Surveys Reveal Ancient Impact Crater Beneath Iowa Town

DECORAH, Iowa (UPI) — Scientists say air and ground surveys have allowed them to confirm the existence of an ancient impact crater buried beneath a town in Iowa.

Researchers writing in Earth Magazine, published by the American Geosciences Institute, report an airborne geophysical survey and hydrology surveys identified a crater at 3.4 miles wide, almost five times the size of the Barringer Meteor Crater in Arizona.

“We now have three distinct data sets that all confirm the presence and geometry of an impact structure,” said Andy Kass, a geophysicist with the U.S. Geological Survey in Denver.

The crater’s existence was first hypothesized in 2008 when geologists examining cuttings from water wells drilled near the town of Decorah were surprised to find evidence of a previously unknown shale deposit.

“We were really lucky in this case that the shale layer was preserved within the crater, as it was eroded away nearly everywhere else,” Kass said. “If you travel to Decorah, you see a beautiful town, but certainly no impact structure.”

Scientists say the crater’s size suggests a meteorite roughly 250 yards in diameter hit the region about 500 million years ago.

Statistically, similar-sized impactors could hit Earth’s surface every 30,000 to 60,000 years, they said.

UPI - United Press International, Inc.

Since 1907, United Press International (UPI) has been a leading provider of critical information to media outlets, businesses, governments and researchers worldwide.

Facebook Conversations

Join the Discussion:
View Comments to “Surveys Reveal Ancient Impact Crater Beneath Iowa Town”

Comment Policy: We encourage an open discussion with a wide range of viewpoints, even extreme ones, but we will not tolerate racism, profanity or slanderous comments toward the author(s) or comment participants. Make your case passionately, but civilly. Please don't stoop to name calling. We use filters for spam protection. If your comment does not appear, it is likely because it violates the above policy or contains links or language typical of spam. We reserve the right to remove comments at our discretion.

Is there news related to personal liberty happening in your area? Contact us at newstips@personalliberty.com

Bottom
close[X]

Sign Up For Personal Liberty Digest™!

PL Badge

Welcome to PersonalLiberty.com,
America's #1 Source for Libertarian News!

To join our group of freedom-loving individuals and to get alerts as well as late-breaking conservative news from Personal Liberty Digest™...

Privacy PolicyYou can opt out at any time. We protect your information like a mother hen. We will not sell or rent your email address to anyone for any reason.