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

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 in Lake Huron, answers a question scientists have asked for decades about the rise in Earth’s oxygen levels. Read the full story by The Alpena News.

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