Abstract
A novel series of tricyclic ring-C monoaromatic terpanes and a minor group of tricyclic diaromatic terpanes were characterized in Tasmanian tasmanite. The monoaromatic series ranges from C 18 to C 40, with a homolog distribution pattern similar to the geologically ubiquitous tricyclic terpane series. The diaromatic compounds are comprised of the C 17-C 19 homologs. The occurrence of these aromatic compounds in an immature sediment ( R o = 0.3–0.4%) indicates an early diagnetic origin or possibly a direct biological input. The implications of these findings to the search for the precursors of these biomarkers is discussed. A minor series of aromatic des-A-triterpenoid hydrocarbons from biodegraded terrestrial lipids is also present.
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