Abstract
This chapter discusses the calcareous nannofossil biostratigraphy and palaeomagnetism of the Monte Tondo and Monte del Casino sections (Romagna Apennines, Italy). Two sections at Monte Tondo and Monte del Casino (Romagna Apennines), spanning the Tortonian/Messinian boundary are exposed as badlands at the foot of the prominent cliff of the Vena del Gesso Messinian evaporites. Preparation of the calcareous nannofossil samples followed standard techniques—no centrifugation is done in order to retain the original composition—and a smear slide is mounted with Canada balsam. All the samples show an abundant and moderate- to well-preserved nannoflora. The assemblages mainly consist of Reticulofenestra and Dictyococcites spp. Coccolithus pelagicus , Reticulofenestra pseudoumbilicus , Sphenolithus moriformis , Sphenolithus abies and Syracosphaera pulchra are commonly recorded, as well as Scyphosphaera spp., Triquetrorhabdulus rugosus and Rhabdosphaera spp. The genus Discoaster is very abundant in the studied sections, but the state of preservation rarely allows distinguishing the different species, especially in the case of the six-rayed forms, very often showing secondary calcite overgrowth.
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