chemical fossils


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chemical fossils

traces of chemicals such as porphyrins and alkanes which are said to be indications of life having existed before the formation of true fossil-bearing rocks.
References in periodicals archive ?
The chemical fossils were found in ancient sedimentary rock strata in Oman that date to the "Cryogenian" ice ages.
The potential to find key evidence indicative of life-biofabrics, microbial remains, chemical fossils in minerals-is high when sedimentary deposits form from hydrothermal fluids.