Microfossil assemblages zonations and planktonic datum levels in the ieper formation (Ypresian s.s. Early eocene) in Belgium
Willems, W.A.E. (1982). Microfossil assemblages zonations and planktonic datum levels in the ieper formation (Ypresian s.s. Early eocene) in Belgium. Professional Paper. Geological Survey of Belgium, 1982/08(194). Geologische Dienst van België: Brussel. 20 pp., 1 fig., 2 tab pp.
Deel van: Professional Paper. Geological Survey of Belgium. Belgische Geologische Dienst: Brussel. ISSN 0378-0902, meer
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