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Geological Society, London, Special Publications; 1995; v. 85; p. 75-114;
DOI: 10.1144/GSL.SP.1995.085.01.06
© 1995 Geological Society of London

High-resolution palynofacies investigation of Kimmeridgian sedimentary cycles

Helen K. Waterhouse

Department of Geology, The University, Southampton, S17 1BJ, UK

Palynofacies analysis is used as a tool to investigate in detail the palaeoenvironmental variations through several sedimentary cycles in the Kimmeridge Clay of Kimmeridge Bay, Dorset, UK. Evidence is given of palaeoenvironmental variations within cycles corresponding to those expected for obliquity orbital forcing. In addition, a second cyclical palaeoenvironmental variation, probably precessional forced, is seen in the palynofacies data. Further small-scale variations in palynofacies characteristics, which are not evident in the sedimentology, are also identified and allow cycles to be divided into a number of distinct palaeoenvironmental units. It is proposed that the obliquity cycle had its greatest effects on the marine environment, while the precessional cycle mainly affected the terrestrial environment. The abundance of useful palaeoenvironmental and palaeoclimatic information obtainable through high-resolution sampling in conjunction with a tool such as palynofacies analysis, provides evidence for and information about orbital forcing additional to that of most orbital forcing studies as it allows variations within cycles to be investigated.





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