Symbiosen van serpula's met ammonieten
Grondboor & Hamer , Volume 29 - Issue 3 p. 97- 100
Symbioses of serpulas with ammonites are described from the Dorset Coast near Charmouth and from the vicinity of Osnabrück (Germany). A find of an erratic with such an ammonite from Westerhaar (the Netherlands) is described too.
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