The Kassel Formation, also known as the Kasseler Meeressande, was deposited during the Chattian stage
of the Late Oligocene in a marine gulf located in the area where the modern city of Kassel is situated.
Its rich foraminiferal diversity is characterized by shallow water faunas in a warm, subtropical, near shore ocean setting.

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So far 254 specimens are integrated, representing 109 species (26 sp.) based on samples from 4 localities:
Gudenberg, Ahnetal, Niederkaufungen and Glimmerode (red asteriks).

Map from Nordmeyer, Norbert 1981: Der oberoligozäne Meeressand von Kassel, APH Jahrgang 9 Heft 6, 1-12.