Participamos en el Tercer Congreso Paleontológico Internacional
El Tercer Congreso Paleontológico Internacional (Third International Palaeontological Congress, IPC3) tendrá lugar en Londres del 28 de junio al 3 de julio de 2010, en la Escuela Real de Minas (Royal School of Mines) del Imperial College y en el Museo de Historia Natural (Natural History Museum).
Panorámica de la fachada principal del Natural History Museum de Londres. Fotografía tomada de Wikipedia.
El equipo de investigación del MUJA, en colaboración con Franz Fürsich (Universidad de Erlangen), Winfried Werner (Museo Paleontológico de Munich), Graciela Delvene (Instituto Geológico y Minero de España, IGME) y Carlos Aramburu (Área de Estratigrafía de la Universidad de Oviedo) presentará un trabajo titulado Concentraciones de conchas registran ciclos climaticos: la Formación Tereñes del Jurásico Superior del del Norte de España.
La investigación forma parte del proyecto “Caracterización de la biodiversidad del Jurásico Superior de Asturias: interés paleontológico y patrimonial de sus yacimientos incluidos en la figura de Monumento Natural“, dirigido por Graciela Delvene.
La referencia del trabajo es:
Fürsich, F.T., W. Werner, G. Delvene, J.C. García-Ramos & C. Aramburu. 2010. Shell concentrations record climatic cycles: the Upper Jurassic Tereñes Formation of Northern Spain. Abstracts. Third International Palaeontological Congress. IPC3. London 2010, 174.
Puede descargarse, junto al resto de trabajos que se presentarán en el congreso, en este archivo pdf. El programa del congreso puede consultarse aquí.
El trabajo se presentará como poster dentro del “Simposio 20: Tafonomía“, el miércoles 30 de junio, de 17:15-18:15, en la Queen’s Tower Room del Imperial College de Londres.
Fachada de la Royal School of Mines del Imperial College de Londres. Fotografía tomada de Wikipedia.
El resumen del trabajo es el siguiente:
SHELL CONCENTRATIONS RECORD CLIMATIC CYCLES: THE UPPER JURASSIC TEREÑES FORMATION OF NORTHERN SPAIN
FURSICH, Franz T.(1), WERNER, Winfried(2), DELVENE, Graciela(3), GARCIA-RAMOS, Jose Carlos(4) & ARAMBURU, Carlos(5)
1: FG Palaoumwelt, GeoZentrum Nordbayern der Universitat Erlangen, Loewenichstrasse 28, D-91054 Erlangen, Germany. e-mail: franz.fuersich@gzn.uni-erlangen.de
2: Bayerische Staatssammlung fur Geologie und Palaontologie, Richard-Wagner-Strasse 10, D-80333 Munchen, Germany
3: Instituto Geologico y Minero de Espana, C/. Rios Rosas, 23, 28003 Madrid, Spain
4: Museo del Jurasico de Asturias (MUJA), Colunga, Asturias, Spain
5: Departamento de Geologia, Universidad de Oviedo, Oviedo, Spain
The Kimmeridgian Tereñes Formation consists of metre- to decametre-scale coarsening-upward cycles. These cycles start with a thin shell bed of the oyster Nanogyra virgula and networks of Thalassinoides, followed by marly siltstone with numerous shell beds and pavements of the bivalve Corbulomima. The cycles are commonly topped by sandstones with abundant dinosaur tracks, or else by marly fine-sandy siltstone and fine-grained sandstone, bioturbated by Rhizocorallium irregulare and Thalassinoides. These deepeningshallowing cycles are best explained as resulting from the progradation of delta lobes in a protected environment (?shelf lagoon), characterised by anoxic to dysoxic conditions. The abundant shell concentrations and the intervening unfossiliferous sediments are thought to represent a lower order of cyclicity, controlled by high-frequency climatic oscillations. Three regimes appear to govern sedimentation and biological activity in the shelf lagoon. The first is characterized by low-energy conditions and dysoxic to anoxic conditions, inimical to most benthic life. With increasing oxygenation (regime 2; dysoxic conditions) the sea floor was colonised by Corbulomima and Protocardia. An increase in water energy (regime 3) led to winnowing, reworking, and local transport of shells. The shell concentrations thus record a cyclic change from equal to more extreme climate conditions. As several hundreds of these shell concentrations occur within the higher-order cycles, the time scale of these cycles is below that of the Milankovitch band. A seasonal origin can also be excluded, as the life span of the bivalves most likely was more than one year. Instead, the high frequency cycles probably record centennial climatic oscillations.
