GSA Today
Volume 23, Number 9 (September 2013)

Cover image

About the cover:
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. See related article, p. 4–9.

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