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Better late than never - making a billion-year-old geologic feature great again

Dec 08, 2017 06:35AM ● Published by Editor

Geologists have disproved a theory about what stopped the formation of the Midcontinent Rift, which is responsible for creating the dramatic cliffs on the shores of Lake Superior.

Geologists have corrected a mix-up that made an ancient geological structure in the central U.S. seem hundreds of miles shorter than it really is. The biggest failed rift known to geologists is even bigger than originally thought, according to research that will be presented at the American Geophysical Union fall meeting Dec. 11 in New Orleans.

The Midcontinent Rift, which started but failed to split North America in two pieces 1.1 billion years ago, is the biggest failed rift ever discovered. It was formed when 350,000 cubic miles of volcanic rock poured out of the rift and formed the beautiful cliffs around Lake Superior. South of Lake Superior, the volcanic rocks are covered by younger rocks, so it wasn't clear how far the rift extended.

Lake Superior

For decades, geologists believed the rift stopped in southern Michigan, but a joint study by geologists at the University of Illinois at Chicago (UIC), Northwestern University, the University of Oklahoma and the University of Göttingen, Germany, reveals the rift extends much farther – as far south as Oklahoma.

Successful geologic rifts cut through the Earth’s surface, splitting continents in two and forming new ocean basins, but something prevented the Midcontinent Rift from completing this process. Until now, geologists believed the Grenville Front halted the Midcontinent Rift’s growth.

"Geologists got confused by the Grenville Front, which appears in southeast Canada," said Carol Stein, lead author of the study and professor of Earth and environmental sciences at UIC. “It marks where another continent collided with North America after the Midcontinent Rift formed.” 

"Somehow the idea developed that the Grenville Front extended south into the U.S., cutting off the Midcontinent Rift in Southern Michigan," explained coauthor Seth Stein, professor of Earth and planetary sciences in Northwestern’s Weinberg College of Arts and Sciences. “That didn’t make sense because there wasn't any good reason for the rift to stop there. 

To sort this out, the researchers used gravity data to "see" underground.

"The Midcontinent Rift shows up nicely," explained coauthor Reece Elling, a graduate student in Earth and planetary sciences at Northwestern. "The rift's volcanic rocks are very dense, so they pull downward strongly. In contrast, the Grenville Front doesn't have these dense rocks, and so it doesn’t cause the gravity high we see."

The gravity high shows that the underground rift has an east arm that extends south from Lake Superior through Michigan, Ohio, Kentucky, Tennessee and Alabama. The gravity high also maps a western arm that extends as far south as Oklahoma.

"This make sense in terms of how continents grow," said coauthor Jonas Kley of the University of Göttingen, Germany.

The new analysis "makes the Midcontinent Rift great again," explains coauthor Randy Keller, professor emeritus of geology and geophysics at the University of Oklahoma. "It's a major structure and should be recognized accordingly."

The results of the study will be published in GSA Today at a later date.

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  • Women's Yoga at Cobblestone Cabins

    01/31/2018
    05:15PM — 07:00PM

    Continuing class for all women interested in Iyengar Yoga. Walk-ins allowed with permission from ...


  • Beginning Spanish

    01/31/2018
    05:30PM — 07:00PM

    January 17, 24, 31, & February 7, 2018 | 5:30PM-7PM START LEARNING SPANISH or HELP REGAIN LOS...


  • Beginning Spanish

    01/31/2018
    05:30PM — 07:00PM

    January 17, 24, 31 and February 7th on Wednesdays 5:30-7pm Focus on vacation and travel languag...


  • Square Dance Lessons

    01/31/2018
    07:30PM — 09:00PM

    Modern Western Square Dance Schedule for January 4 through February 15. Time: 7:30 – 9:00 PM ...


  • The 100DayProject

    02/01/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/01/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Lunch At the Senior Center

    02/01/2018
    12:00PM — 12:30PM

    Meatloaf/Baked Potato/Peas/Dessert/Milk


  • Alcoholics Anonymous

    02/01/2018
    06:30PM

    Alcoholics Anonymous is a fellowship of men and women who share their experience, strength and ho...


  • Film Night at North House

    02/01/2018
    07:00PM — 09:00PM

    Winter Series returns every Thursday in February at North House with film nights. We’ll revisit f...


  • Square Dance Lessons

    02/01/2018
    07:30PM — 09:00PM

    Modern Western Square Dance Schedule for January 4 through February 15. Time: 7:30 – 9:00 PM ...


  • The 100DayProject

    02/02/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/02/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Lunch at the Senior Center

    02/02/2018
    12:00PM — 12:30PM

    Brats/Sauerkraut/Mash Potato/Dessert/Milk


  • Lunch at the Senior Center

    02/02/2018
    12:00PM — 12:30PM

    Brats/Sauerkraut/Mash Potato/Dessert/Milk


  • The 100DayProject

    02/03/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/03/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Voyageur Brewing Company Brewery Tour

    02/03/2018
    11:30AM — 12:30PM

    We offer tours on most Saturdays beginning at 11:30am but you need to reserve your space online i...


  • Square Dance Lessons

    02/03/2018
    07:30PM — 09:00PM

    Modern Western Square Dance Schedule for January 4 through February 15. Time: 7:30 – 9:00 PM ...


  • The 100DayProject

    02/04/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/04/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Alcoholics Anonymous

    02/04/2018
    06:30PM — 07:30PM

    Alcoholics Anonymous is a fellowship of men and women who share their experience, strength and ho...


  • The 100DayProject

    02/05/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/05/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Band Instrument Drive

    02/05/2018
    08:00AM

    The Cook County School band is looking to expand our program and include all 5th graders. Current...


  • 1/2 Price Burgers!

    02/05/2018
    11:00AM — 09:00PM

    1/2 Price Burgers at Moguls Grille and Tap Room


  • Lunch at the Senior Center

    02/05/2018
    12:00PM — 12:30PM

    Sloppy Joes/Baked Beans/Coleslaw/Fruit/Milk


  • Overeaters Anonymous

    02/05/2018
    04:15PM — 05:15PM

    Overeaters Anonymous is a fellowship of individuals who, through shared experience, strength and...


  • Co-Dependents Anonymous

    02/05/2018
    05:30PM

    Co-Dependents Anonymous is a Fellowship of men and women whose common purpose is to develop healt...


  • Square Dance Lessons

    02/05/2018
    07:30PM — 09:00PM

    Modern Western Square Dance Schedule for January 4 through February 15. Time: 7:30 – 9:00 PM ...


  • The 100DayProject

    02/06/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/06/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Story Time at the Library

    02/06/2018
    10:30AM — 11:15AM

    Every Tuesday, January 9-February 27, story times are open to all ages and feature songs and othe...


  • Lunch at the Senior Center

    02/06/2018
    12:00PM — 12:30PM

    Soup/Sandwich/Dessert/Milk


  • Bible Prophecy

    02/06/2018
    04:00PM — 05:30PM

    National and International speakers presented by DVD. The DVDs will be shown at the Community Ce...


  • Kids Eat Free

    02/06/2018
    04:00PM — 09:00PM

    1 free kids meal with any paid adult meal Available after 4pm


  • Colvill All-Levels Yoga

    02/06/2018
    05:30PM — 06:30PM

    Join us for yoga. Vinyasa-style yoga set to world music. Come rest your mind and energize your ...


  • Men's Yoga at Cobblestone Cabins

    02/06/2018
    05:30PM — 07:00PM

    Iyengar style yoga class for men interested in a well rounded yoga practice.


  • Intro/Beginning Iyengar Yoga at Cobblestone

    02/06/2018
    07:05PM — 08:20PM

    Class suited for introductory or beginning students. The basics of Iyengar style yoga will be tau...


  • Learn to Dance!

    02/06/2018
    07:15PM — 09:00PM

    Learn to waltz, two-step, foxtrot, and swing dance. Tuesdays at the 4-H Building, 7:15 to 9:00 PM...


  • The 100DayProject

    02/07/2018
    12:00AM — 12:00AM

    January 21 - April 30, 2018 The 100DayProject is an effort to motivate participants to commit ...


  • Terra Bella Floral fall hours

    02/07/2018
    12:00AM

    Monday and Tuesday Noon to 5 Wednesday through Friday 10 to 4 Saturday 10 to 2 Sunday Closed


  • Anxiety/Depression Support Group for Women

    02/07/2018
    10:00AM — 11:00AM

    Weekly support group for women. $2.00 suggested donation. No registration required. Please joi...


  • Gentle Yoga at Cobblestone

    02/07/2018
    10:00AM — 11:30AM

    For all with health concerns such as arthritis, high blood pressure, pregnancy or those who just ...


  • 1/2 Price Bottles of Wine

    02/07/2018
    11:00AM

    1/2 Price Bottles of Wine


  • Lunch at the Senior Center

    02/07/2018
    12:00PM — 12:30PM

    Chef's Salad/Fruit/Dessert/Milk


  • Women's Yoga at Cobblestone Cabins

    02/07/2018
    05:15PM — 07:00PM

    Continuing class for all women interested in Iyengar Yoga. Walk-ins allowed with permission from ...


  • Beginning Spanish

    02/07/2018
    05:30PM — 07:00PM

    January 17, 24, 31, & February 7, 2018 | 5:30PM-7PM START LEARNING SPANISH or HELP REGAIN LOS...


  • Beginning Spanish

    02/07/2018
    05:30PM — 07:00PM

    January 17, 24, 31 and February 7th on Wednesdays 5:30-7pm Focus on vacation and travel languag...


  • Square Dance Lessons

    02/07/2018
    07:30PM — 09:00PM

    Modern Western Square Dance Schedule for January 4 through February 15. Time: 7:30 – 9:00 PM ...