| stromatolites, photos, thomas wiewandt, tom wiewandt, images, photographs, photography, gallery, arts |
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h o m a s W i e w a n d t
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columns of blue-green algae, stromatolites, are probably the first
signs of life on Earth visible to the naked eye. Replacement by quartz and iron oxide gives this fossil of Collenia undosa a red color. Specimen from Minnesota courtesy of Dr. Klaus Westphal, University of Wisconsin's Museum of Geology, USA |
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