Allgäu Formation

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) ~201–191 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Sub-units	Alpisella beds
Lithology
Primary	Marl
Other	Limestone
Location
Coordinates	47.7°N 13.7°E / 47.7; 13.7
Approximate paleocoordinates	32.5°N 19.9°E / 32.5; 19.9
Region	Vorarlberg Bavaria Graubünden
Country	Austria Germany Switzerland
Allgäu Formation (Austria)

Fossil content

Fish

• Agkistracanthus sp.^[3]

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

• List of fossiliferous stratigraphic units in Austria
• List of fossiliferous stratigraphic units in Germany
• List of fossiliferous stratigraphic units in Switzerland