Publication - Journal Article Biogenicity and Syngeneity of Organic Matter in Ancient Sedimentary Rocks: Recent Advances in the Search for Evidence of Past Life DOI https://doi.org/10.3390/challe5020260 Journal Article Challenges, vol. 5, iss. 2, pp. 260-283, 2014 Authors Dorothy Oehler, Sherry Cady Language English