Contact: Steve Bradt
Caption: In this photo from Canada's Yukon Territory, an iron-rich layer of 716.5-million-year-old glacial deposits (maroon in color) is seen atop an older carbonate reef (gray in color) that formed in the tropics.
Credit: Francis A. Macdonald/Harvard University
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Related news release: New evidence hints at global glaciation 716.5 million years ago