Date Presented:

29 Sep.-5 Oct.

Abstract:

The geotectonic units of the External Hellenides Carbonate Platform are characterized by continuous sedimentation from the Triassic onward. This was terminated by widespread synorogenic flysch sequences of great thicknesses, deposited in foreland basins during the collision stage extending from the Paleogene up to Pliocene in the most external parts. A comprehensive dataset concerning the synorogenic Messinian-Pliocene locations of the Hellenic territory and the available published calcareous nannofossil biostratigraphic results, has been constructed, aiming to standardize the available data and provide realistic biochronologic estimations, according to the available and updated astrobiochronological approaches (e.g., Lourens et al., 2004; Raffi et al., 2006; Backman et al., 2012; Agnini et al., 2017). In addition, a series of new locations with their unpublished calcareous nannofossil biostratigraphic determinations (e.g., Triantaphyllou, 2017; Triantaphyllou et al., 2025), are incorporated to the dataset, providing a useful framework for geodynamic interpretations and correlations in the eastern Mediterranean and beyond. The geographical distribution of all the existing data is presented in a series of geological maps arranged according to each nannofossil biozone. The presented dataset contributes to a better understanding of the spatiotemporal impact on biostratigraphic assignments of the different geological-geotectonic origin deposits, practically dating the most recent evolution stages of the Hellenic arc, as also of the factors limiting the distribution and controlling the presence of the widely used nannofossil biostratigraphic indices in the eastern Mediterranean realm. Most of the micropaleontological/geological material associated with the constructed nannofossil biostratigraphy dataset, is already incorporated into the Micropaleontology Collection at the Laboratory of Historical Geology and Biogeosciences, NKUA.