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Strauss C., Elstner F., Chene R.J., Mutterlose J., Reiser H., Brandt K.-H. (1993) New micropaleontological and palynological evidence on the stratigraphic position of the German Wealden in NW-Germany // Zitteliana. Vol. 20. Pp. 389-401.
An integrated micropaleontological and palynological investigation of a fairly complete section of the Biickcberg Formation provided new evidence for its precise correlation with the Boreal and Tethvan stratigraphic standard scales. For the uppermost .Wealden 3“ and lowermost .Wealden 4 a Late Ryazanian age can be assumed by calibrating dinocyst and ostracode data with the Boreal ammonite zonation. Similarly, a (Late?) Early Valanginian age is assumed for the interval from the upper .Wealden 5“ to the top of .Wealden 6“ by calibrating dinocyst range bases with Boreal and Tethvan ammonite zones. In the light of a new chronostratigraphic approach of the Tethyan Lower Cretaceous a preliminary sequence stratigraphic subdivision is given based on lithological and palynofacies data