On the biostratigraphical age of the lower Selandian of Denmark. Meddr dansk geol. Foren

• Main Author: Hans Jørgen Hansen
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1968
• Subjects: Planktonic foraminifera
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.4353; http://2dgf.dk/xpdf/bull18-03-04-277-285.pdf

With evidence from planktonic foraminifera, it is shown that the Lower Selandian (which overlies the Danien in the type area) belongs to the Globorotalia angulata biozone. Since ROSENKRANTZ (1924) proposed the preliminary stage name Selandian for the glauconitic marls and clays deposited upon the Upper Danian lime-stones and overlain by the Ypresian ash layers, much doubt has existed as to the stratigraphical age of the deposits. The lithology of the Selandian sediments was described in detail by GRY (1935). The lithological development of the Selandian sediments starts with a basal conglomerate containing a large amount of redeposited Upper Danian fossils. The conglomerate is followed by glauconitic calcareous sand which displays gradually decreasing grain size upwards. These layers are followed by the Kerteminde Marl which, in its upper part becomes non-calcareous. The clay mineralogy of the Selandian sediments was described