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Image for: A long day for microbes, and the rise of oxygen on Earth


Purple microbial mats in the Middle Island Sinkhole in Lake Huron, June 2019. Small hills and “fingers” like this one in the mats are caused by gases like methane and hydrogen sulfide bubbling up beneath them.
Purple microbial mats in the Middle Island Sinkhole in Lake Huron, June 2019. Small hills and “fingers” like this one in the mats are caused by gases like methane and hydrogen sulfide bubbling up beneath them.

Phil Hartmeyer

Phil Hartmeyer, NOAA Thunder Bay National Marine Sanctuary

(2026 KB, 3543 x 2364 pixels)

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