TL;DR: The qualitative PAH pattern is remarkably constant for most of the locations studied, and the quantitative PAH abundance increases with proximity to urban centers as discussed by the authors, consistent with anthropogenic combustion's being the major source of these compounds.
TL;DR: In this paper, a series of polycyclic aromatic hydrocarbons (PAH) derived by early-diagenetic transformations of biogenic precursors are found in Recent sediments of four lakes ( Lake Lucerne, Lake Zurich, Lake Greifensee, and Lake Washington, northwest U.S.A.).
TL;DR: Combustion-derived and land-plant-derived polycyclic aromatic hydrocarbons (PAHs) have been investigated for an Upper Triassic to Middle Jurassic sedimentary sequence from the Northern Carnarvon Basin, Western Australia as mentioned in this paper.
TL;DR: In this paper, it is suggested that thermally induced formation of retene from phyllocladanes, simonellite being an intermediate of the proposed reaction, and further evidence for this hypothesis has been obtained from laboratory simulation experiments.
TL;DR: A set of 13 Cretaceous-Tertiary coal from western Canadian coal deposits and two Cretaneous coals from the southern part of the Lower Saxony Basin of Germany have been investigated using microscopial and organic geochemical methods.