Figure 1 from: Voss M (2014) On the invalidity of Halitherium schinzii Kaup, 1838 (Mammalia, Sirenia), with comments on systematic consequences. Zoosystematics and Evolution 90(1): 87-93. https://doi.org/10.3897/zse.90.7421

Figure 1 - Geographic setting and palaeogeography of the Mainz Basin (black star) in western Germany during the early Oligocene (~ 32 Ma). White areas indicate land, grey areas represent marine conditions (modified after Probst 1986).