Illinois Featured Content

  • Explaining the Great Unconformity

    Mar 14, 2019 10:00 am by Abby PaethResearch
    visibile line of 'the great unconformity' as seen in the Grand Canyon

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    • visibile line of 'the great unconformity' as seen in the Grand Canyon

    What happened to 1.2 billion years of history? Illinois geologist William Guenthner digs for answers.