The Allgäu Formation is a geologic formation in Austria, Germany and Slovakia. It preserves fossils dated to the Hettangian and Sinemurian ages of the Early Jurassic Epoch, or Raricostatum to Obtusum in the regional stratigraphy. The formation was initially and formally defined by Jacobshagen (1965).Jacobshagen, 1965 The Allgäu Formation was formerly known as spotted marls (Lias-Fleckenmergel) and spotted marly limestones (Fleckenkalk). The formation is represented by dark-grey bioturbated limestones and marlstone interbeds. It represents basinal hemipelagic faciesGawlick et al., 2009 common in Alpine Tethys regions of Alps, Carpathians and other mountain ranges. Several horizons of the formation are particularly rich in ammonite fossils.
Fossil content Fish Agkistracanthus sp.Duffin & Furrer, 1981
AmmonitesBlau, 1998 Echioceras raricostatoides Epophioceras landrioti Leptechioceras meigeni Asteroceras cf. suevicum Juraphyllites sp. Paltechioceras sp. Villania sp.
RhynchonellataSulser & Furrer, 2008 Carapezzia engadinensis Sulcirostra doesseggeri Sulcirostra cf. zitteli
See also List of fossiliferous stratigraphic units in Austria List of fossiliferous stratigraphic units in Germany List of fossiliferous stratigraphic units in Switzerland
References
Bibliography
Gawlick, H.J., Missoni, S., Schlagintweit, F., Suzuki, H., Frisch, W., Krystyn, L., Blau, J. & Lein, R., 2009, Jurassic Tectonostratigraphy of the Austroalpine Domain. Journal of Alpine Geology, 50, p. 1–152 H. Sulser and H. Furrer. 2008. Dimerelloid rhynchonellide brachiopods in the Lower Jurassic of the Engadine (Canton Graubünden, National Park, Switzerland). Swiss Journal of Geosciences 101:203-222 J. Blau. 1998. Monographie der Ammoniten des Obersinemuriums (Lotharingium, Lias) der Lienzer Dolomiten (Österreich): Biostratigraphie, Systematik und Paläobiogeographie. Revue de Paléobiologie, Genève 17:177-285 C. J. Duffin and H. Furrer. 1981. Myriacanthid holocephalan remains from the Rhaetian (Upper Triassic) and Hettangian (Lower Jurassic) of Graubünden (Switzerland). Eclogae Geologicae Helvetiae 74:803-829 Jacobshagen, V. von, 1965, Die Allgäu-Schichten (Jura-Fleckenmergel) zwischen Wettersteingebirge und Rhein. Jb. Geol. B. A., 108, pp. 1–114