Allgäu Formation
The Allgäu Formation is a geologic formation in Austria. It preserves fossils dating back to the Hettangian to Sinemurian stages of the Early Jurassic period, or Raricostatum to Obtusum in the regional stratigraphy. Initially and formally defined by Jacobshagen (1965).[1] The Allgäu Formation is 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 facies[2] common in Alpine Tethys regions of Alps, Carpathians and other mountain ranges. Several horizons of the formation are particularly rich in ammonite fauna.
| Allgäu Formation Stratigraphic range: Hettangian-Sinemurian (Raricostatum-Obtusum) ~201–191 Ma | |
|---|---|
| Type | Formation |
| Sub-units | Alpisella beds |
| Lithology | |
| Primary | Marl |
| Other | Limestone |
| Location | |
| Coordinates | 47.7°N 13.7°E |
| Approximate paleocoordinates | 32.5°N 19.9°E |
| Region | Vorarlberg Bavaria Graubünden |
| Country |  Austria Germany Switzerland |
  Allgäu Formation (Austria) | |
Fossil content
- Fish
- Ammonites[4]
- Echioceras raricostatoides
- Epophioceras landrioti
- Leptechioceras meigeni
- Asteroceras cf. suevicum
- Juraphyllites sp.
- Paltechioceras sp.
- Villania sp.
- Rhynchonellata[5]
- Carapezzia engadinensis
- Sulcirostra doesseggeri
- Sulcirostra cf. zitteli
See also
References
- Jacobshagen, 1965
- Gawlick et al., 2009
- Duffin & Furrer, 1981
- Blau, 1998
- Sulser & Furrer, 2008
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
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