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_NMG0451-stack_cyanobacteria stromatolites stromatoliths thrombolites Torres del Paine.jpg
Thrombolites and stromatolites or stromatoliths - layered mounds of sedimentary rock, originally formed from the growth of layer upon layer of cyanobacteria. On the shoreline of Lago (Lake) Sarmiento on the outskirts of Torres del Paine National Park, Patagonia, Chile.