ABOVE: Shale in Canada, not from study site
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Fossils of fungi in Arctic Canada date back to anywhere from 890 million to more than 1 billion years ago, according to a study published today (May 22) in Nature. The previously known earliest fossil fungi were from Scotland and Wisconsin and date back 410 million and 450 million years ago, respectively.
A team of paleontologists looked at samples from shale rocks from Arctic Canada under a microscope and discovered the fossilized fungi. The specimens come from the species Ourasphaira giraldae, which is a fungus with a bilayered cell wall.
The researchers report that when they shined infrared light on three of the fossils, the specimens produced a light pattern that matches what would be produced by the protein chitin, often found in the cell walls of fungi. “The preservation is so good that we still have the organic compounds,” ...
