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.
Eglinton pioneered modern investigations of chemical fossils in sedimentary rocks, providing tools that expanded knowledge about Earth's earliest life forms, ancient ocean temperatures, environmental changes on continents, and other details about our planet and its history.
His speciality is mass spectrometry - unlocking the secrets of tiny bits of dust and rock - "chemical fossils" as he calls them.
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.