Abstract
A high-resolution cyclostratigraphy for the rhythmically bedded lignite-marl sequences of the Lower Pliocene Ptole-mais
Formation is combined with 40 Ar= 39 Ar dating results of intercalated volcanic ash beds. Detailed field reconnaissance
in three open-pit lignite mines reveals three end-member sediment types: lignites, composed primarily of organic material;
grey marls, a mixture of
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