W. J Kennedy and W. JM Jagt (1995)
Lower Campanian heteromorph ammonites from the Vaals Formation around Aachen,Germany,and adjacent parts of Belgium and The Netherlands
Neues Jahrbuch für Geologie und Paläontologie,Abhandlungen, vol. 197,3 p. 275-294.
09803, 108, 109, Lg, MEUSE2, CRET, PAL
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