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Swiss Journal of Geosciences

, Volume 103, Issue 1, pp 101–119 | Cite as

Facies, depositional environment, and palaeoecology of the Middle Triassic Cassina beds (Meride Limestone, Monte San Giorgio, Switzerland)

  • Rudolf StockarEmail author
Article

Abstract

The Ladinian Cassina beds belong to the fossiliferous levels of the world-famous Middle Triassic Monte San Giorgio Lagerstätte (UNESCO World Heritage List, Canton Ticino, Southern Alps). Although they are a rich archive for the depositional environment of an important thanatocoenosis, previous excavations focused on vertebrates and particularly on marine reptiles. In 2006, the Museo Cantonale di Storia Naturale (Lugano) started a new research project focusing for the first time on microfacies, micropalaeontological, palaeoecological and taphonomic analyses. So far, the upper third of the sequence has been excavated on a surface of around 40 m2, and these new data complete those derived from new vertebrate finds (mainly fishes belonging to Saurichthys, Archaeosemionotus, Eosemionotus and Peltopleurus), allowing a better characterization of the basin. Background sedimentation on an anoxic to episodically suboxic seafloor resulted in a finely laminated succession of black shales and limestones, bearing a quasi-anaerobic biofacies, which is characterized by a monotypic benthic foraminiferal meiofauna and has been documented for the first time from the whole Monte San Giorgio sequence. Event deposition, testified by turbidites and volcaniclastic layers, is related to sediment input from basin margins and to distant volcanic eruptions, respectively. Fossil nekton points to an environment with only limited connection to the open sea. Terrestrial macroflora remains document the presence of emerged areas covered with vegetation and probably located relatively far away. Proliferation of benthic microbial mats is inferred on the basis of microfabrics, ecological considerations and taphonomic (both biostratinomic and diagenetic) features of the new vertebrate finds, whose excellent preservation is ascribed to sealing by biofilms. The occurrence of allochthonous elements allows an insight into the shallow-waters of the adjoining time-equivalent Salvatore platform. Finally, the available biostratigraphic data are critically reviewed.

Keywords

Cassina beds Middle Triassic Monte San Giorgio Facies Palaeoecology Depositional environment 

Notes

Acknowledgments

During the first 3 years of excavations in the upper part of the Cassina beds, the author benefited from the help of colleagues and students from Swiss, German and Italian universities. He is indebted to Heinz Furrer, Silvio Renesto, Cristina Lombardo, Roberto Rettori, Toni Bürgin, Adriana Lòpez-Arbarello and Evelyn Kustatscher for the stimulating discussions about different aspects of the Cassina excavation, and to Remo Pagani, the landowner at Cassina, for his enthusiastic interest in the excavations. The author would like to acknowledge the hard work and unconditional commitment of many volunteers during the field work; nothing would have been possible without Urs Oberli, Sergio Pezzoli, Sergio Rampinelli, Margrit Pfister, and the many other “Cassina enthusiasts”. Many thanks to Stefano Doninelli (commissione parrocchiale Monte San Giorgio) for having friendly placed the Adenofora mountain refuge at our disposal, and to the municipality of Meride for the logistic support. Earlier drafts of the manuscript benefited from careful re-readings by Peter Baumgartner, Daniel Bernoulli and Silvio Renesto. The preparation of vertebrate and plant fossils was carried out by Heinz Lanz, Urs Oberli, Sergio Rampinelli, Debora Tollardo, Luca Zulliger, and the author. Financial support was granted by the Dipartimento del territorio del Cantone Ticino (Museo Cantonale di Storia Naturale) and the Swiss Federal Office for the Environment (FOEN). The author is grateful to the reviewers Rainer Brandner and Heinz Furrer, and to the editors Andreas Wetzel and Daniel Marty for constructive comments on the manuscript, which greatly improved the paper.

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© Swiss Geological Society 2010

Authors and Affiliations

  1. 1.Museo Cantonale di Storia NaturaleLuganoSwitzerland
  2. 2.Institut de Géologie et PaléontologieUniversité de LausanneLausanneSwitzerland

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