By James G. Lawless, Etta Peterson (auth.), J. Oró, S. L. Miller, C. Ponnamperuma, R. S. Young (eds.)
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Additional resources for Cosmochemical Evolution and the Origins of Life: Proceedings of the Fourth International Conference on the Origin of Life and the First Meeting of the International Society for the Study of the Origin of Life, Barcelona, June 25–28, 1973 Volume II: Contri
Nevertheless, the validity of many reported microfossils, especially those known from rocks of the upper Precambrian, is beyond any doubt; these forms require only additional, more careful study and description (with observance of all rules of the International Code of Botanical Nomenclature) which will undoubtedly permit their use for biostratigraphic purposes. Menner, who for many years has promoted the development of a biostratigraphy for the Precambrian, especially dwelled upon these questions at the Third International Palynological Conference (Menner, 1973).
Although many geochemists do not like the idea of ultraviolet light among life forms, it should be recognized that it is a good mutagenic agent. Furthermore, in an organicaIIy rich 'microniche' at the surface of the Earth, oxygen could be produced by ultraviolet photolysis of water. However, if ultraviolet light did not penetrate through the primitive atmosphere, then suitable 'microniches' could have occurred in droplets of water suspended in the atmosphere after storms. --? BACTERIA ALGA-LIKE 5 I 1 1 4 3 2 A ONVERWACHT A OXYG E N ORGANISMS TI ME (YEARS x 10 9 ) A STE AD Y STATE CO2 SERIES Fig.
MORIT A Dept. of Microbiology and School of Oceanography, Oregon State University, Corvallis, Ore. A. Abstract. Various processes for the production of carbon dioxide by microorganisms are presented. It is postulated that a 'microniche' developed in a reducing environment; a symbiotic relationship between alga-like organisms and bacterium-like organisms in the 'microniche' governed the production of carbon dioxide resulting in the establishment of the steady state carbon dioxide system in the sea.