Origin of the atmosphere : history of the release of volatiles from the solid earth / James C.G. Walker -- Early precambrian weathering and sedimentation : an impressionistic view / Raymond Siever -- Very old (>100 million years) rocks in North America / R. Hurst, J. Farhat, and G. Wetherill -- Three arguments for continual evolution of sial throughout geologic time / John J.W. Rogers -- Archean geology and evidence of ancient life in the slave structural province, Canada / John B. Henderson -- Carbon contents of early Precambrian rocks / Carleton B. Moore and Donna Welch -- Condensed phosphates from abiotic systems in nature / E.J. Griffith -- Hydrocarbons and fatty acids in oil shale or Permian irati formation, Brazil / D.W. Nooner and J. Oro -- The stable isotopes of hydrogen in the hydrogen in Precambrian organic matter / thomas C. Hoering -- Eveolution of the terrestrial oxygen budget / Manfred Schidlowski and Rudolf Eichmann -- Evidences of Archean life / J. William Schopf -- Earliest evidence of fossil eucaryotes / J. William Schopf -- Paleobiology of stromatolites / Stanley M. Awramik -- Natural mechanisms of protection of a blue-green alga against ultraviolet light / Mitchell Rambler, Lynn Margulis, and Elso S. Barghoorn -- Kakabekia, a review of its physiological and environmental features and their relation to its possible ancient affinities / Barbara Z. Siegel -- A discussion of biogenicity criteria in a geological context with examples from a very old greenstone belt, a Late Precambrian deformed zone, and tectonized Phanoerozoic rocks / M.D. Muir [and others] -- Synthetic organic microstructures as model systems for early protobionts / Claire Folso -- Comparison of laboratory silicified blue-green algae with Precambrian microorganisms / S. Francis [and others] -- Eoastrion and the metallogenium problsm / Elso S. Barghoorn -- Evolution of mitosis and the late appearance of metazoa, metaphyta, and fungi / L. Margulis -- Iron-sulfur proteins and superoxide dimutases in the evolution of photosynthetic bacteria and alage / C.O. Hall, J. Lumsden. and E. Tel-Or -- Low oxygen levels and the palmitol CoA desturase of yeast : relation to primitive biological evolution / Nancy Symmes Whitaker and Harold P. Klein.