chert” (Barghoorn and Tyler, 1965), followed a few weeks later by Cloud 's contribution, “Significance of the Gunflint (Precambrian) microflora” (Cloud, 1965). Landmark papers they were!
Unlike the 1954 Tyler-Barghoorn announcement of discovery of the Gunflint fossils, which had gone largely unnoticed, the Barghoorn-Tyler 1965 article—backed by Cloud's affirmation of its significance—gener-
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2 Solution to Darwin's Dilemma: Discovery of the Missing Precambrian Record of Life ."
Variation and Evolution in Plants and Microorganisms: Toward a New Synthesis 50 Years after Stebbins . Washington, DC: The National Academies Press,
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