Sept. <i>GSA Today</i> cover (IMAGE)

Geological Society of America

Sept. <i>GSA Today</i> cover

Caption

This image shows actively growing, subtidal stromatolites north of Carbla Point, Shark Bay, Western Australia. The individual build-ups are separated by areas of rippled, bare sand. The sand is not overgrown by microbial mat because the grains are in constant motion by waves and tidal currents. Photo by Stan Awramik.

Credit

Stanley Awramik for <i>GSA Today</i>.

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