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Growth and formation of microterracettes from slides incubated in Beowulf Spring. Scanning electron micrographs (A–C) of ridge structures: scale bar = 1 μm (A), and 10 μm (B,C). Photograph of larger, 1 mm ridges (D) present in 70 days Fe(III)-oxide mats incubated for 70 days (scale bar = 1 mm). The flow direction (arrows) is perpendicular to microterracettes.
