50.1 MB (7.4 MB compressed)
3496 x 5005 pixels
29.7 x 42.4 cm ⏐ 11.7 x 16.7 in (300dpi)
BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Thrombolites. These living fossils, which are 650 million years old, are formed by cyanobacteria that have calcified. Photographed at Flower's Cove, Newfoundland, Canada.
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