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COVER: Field photograph showing an outcrop of Earth's oldest stromatolites from the 3.481 Ga Dresser Formation, Pilbara, Western Australia. Finely layered and laminated wrinkly and undulating laminations are replaced by hematite, but nonetheless preserve numerous morphological characteristics diagnostic of a biogenic origin. See ‘Advanced two- and three-dimensional insights into Earth's oldest stromatolites (ca. 3.5 Ga): Prospects for the search for life on Mars’, by Hickman-Lewis et al., p. 33–38.
Photo by: Frances Westall
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