Latest Maastrichtian Species-Rich Rudist Associations of Theapulian Margin of Salento (S Italy) and the Ionian Islands (Greece)
Published:January 01, 2007
Thomas Steuber, Mariano Parente, Mischa Hagmaier, Adrian Immenhauser, Bram Van Der Kooij, Gianluca Frijia, 2007. "Latest Maastrichtian Species-Rich Rudist Associations of Theapulian Margin of Salento (S Italy) and the Ionian Islands (Greece)", Cretaceous Rudists and Carbonate Platforms: Environmental Feedback, Robert W. Scott
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Numerical ages have been derived from the 87Sr/86Sr values of well-preserved rudist shells from localities in Salento (S Italy)and Lefkas (Ionian Islands, Greece). Samples are from the platform margin (Salento) and from the toe of slope (Lefkas) of the former Apuliancarbonate platform. Rudists from both localities yielded a latest Maastrichtian age (66.4 Ma), and their rudist associations are the mostspecies-rich so far reported from the Mediterranean region so close to the Cretaceous-Paleogene (K-P) boundary. The abundance of large-size recumbent morphotypes of a taxon similar to Pseudosabinia is remarkable. Generally, the latest Maastrichtian rudist morphotypes ofthe Caribbean and of the Mediterranean region are very similar, although the faunas are highly endemic on the genus level. When comparedto the Turonian-Campanian, the increased abundance of aragonite in the shells of the dominant rudist taxa, and the higher abundance ofother originally aragonitic skeletal components, is discussed with respect to the major-ion composition of Cretaceous seawater. The nowwell-documented existence of species-rich rudist associations on both sides of the Atlantic argues for a catastrophic rather than a gradualextinction of the group.
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Cretaceous Rudists and Carbonate Platforms: Environmental Feedback
Sedimentologists, stratigraphers and paleontologists will find new data in SP 87, "Cretaceous Rudists and Carbonate Platforms: Environmental Feedback". The papers of the Proceedings of the Seventh International Congress on Rudists are organized into three themes: (1) Depositional Environments of Cretaceous Carbonates has been an overarching theme of the Working Group on Cretaceous Carbonate Platforms, Study of rudists, which produced great volumes of carbonate sediment, is central to understanding processes and reservoir prediction. Some of the world's great hydrocarbon reservoirs are rudist debris beds. (2) The Origins, Events, and Demise of Rudist Paleocommunities signal significant local and even global events in Earth systems. Rudist communities responded to oceanic anoxic events and to complex factors that lead to oxygenation of deep ocean water masses. (3) Theme Towards Rudists Taxonomy, Biogeography, and Phylogeny focuses on the paleobiology and systematics of rudists. The foundation of all interpretations of biogeography and paleoecology is solid taxonomy that is agreed upon by the majority of specialists. This is a core, ongoing scientific pursuit.