Allgäu Formation
Geologic formation in Austria
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The Allgäu Formation is a geologic formation in Austria, Germany and Slovakia. 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) ~ | |
| 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