Abstract
A section over 200 m thick spanning the Rhaetian, Liassic and lower Dogger has been cored in the central part of the Swiss Jura Mountains. A combination of sedimentological, geochemical (Rock-Eval pyrolysis), palynofacies and biostratigraphic observations leads to the interpretation of different palaeoenvironments. When compared with sequence stratigraphy and eustatic sea-level changes, these results provide a stratigraphy of organic events. Environmental conditions vary from fully aerobic in the Rhaetian to Sinemurian interval (low sea-level stand), to dysaerobic in the thin condensed Pliensbachian section and fully anoxic in the lower Toarcian Posidonia Schiefer (an excellent immature oil-prone source rock). Dysaerobic conditions are re-established in the late Toarcian, prior to the onset of a fully aerobic environment in the early Middle Jurassic (high sea-level stand).
Published Version
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