Media type: E-Article Title: Highly isotopically depleted isoprenoids: molecular markers for ancient methane venting Contributor: Thiel, Volker; Peckmann, Jörn; Seifert, Richard; Wehrung, Patrick; Reitner, Joachim; Michaelis, Walter imprint: Elsevier BV, 1999 Published in: Geochimica et Cosmochimica Acta Language: English DOI: 10.1016/s0016-7037(99)00177-5 ISSN: 0016-7037 Keywords: Geochemistry and Petrology Origination: Footnote: