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Alpena-area sinkhole offers clues to planet's early history

By: Julie Ridder, The Alpena News

ALPENA — Purple and white microbes jostling for position at the bottom of an Alpena-area sinkhole may solve a longstanding scientific puzzle, researchers announced last month.

Samples of a microbial mat at the bottom of a 75-foot-deep sinkhole off the north shore of Middle Island, near Rockport State Recreation Area in the waters of Thunder Bay National Marine Sanctuary, answers a question scientists have asked for decades about the rise in Earth’s oxygen levels, according to a report recently released by the University of Michigan.

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