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|Mot-Clé-4=sediments

…al of the fossil has decayed but has left an impression in the surrounding sediments. Molds are often filled with a different material, producing strikingly bea …ical "fossil" representinmg colonies of bacteria altenating with layers of sediments. Becoming more common during the Proterozoic, stromatolites persist today…

…dstone formation in Scotland, one of the most important vertebrate-bearing sediments ever discovered. Miller believed that the fossil record confirmed the bibli