Episodes 2001; 24(3): 166-175
Published online September 1, 2001
Copyright © International Union of Geological Sciences.
S. Cresta1, A. Goy2, S. Ureta2, C. Arias2, E. Barrón2, J. Bernad2, M. L. Canales2, F. García-Joral2, E. García-Romero2, P. R. Gialanella2, J. J. Gómez2, J. A. González2, C. Herrero2, G. Martínez2, M. L. Osete2, N. Perilli2, J. J. Villalaín2
1Agenzia regionale Parchi del Lazio, Via Indonesia 33, 00144 Roma, Italy.
2Departamento de Paleontologia, Universidal Complutense de Madrid, 28048 Madrid, Spain.
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The Global Boundary Stratotype Section and Point (GSSP) for the Aalenian Stage, formally deﬁned at the base of bed FZ107 in the Fuentelsaz section, Castilian Branch of the Iberian Range (Spain), has been ratiﬁed by the IUGS. Multidisciplinary biostratigraphical data, based on ammonites, brachiopods, ostracods, bivalves, foraminifera, calcareous nannofossils assemblages and palynomorphs, assure worldwide correlations; magnetostratigraphic data increase this correlation power. The position of the boundary coincides with the ﬁrst occurrence of the ammonite assemblage characterized by Leioceras opalinum and Leioceras lineatum and corresponds with a normal polarity interval correlated with the up-to-date Jurassic magnetic polarity time scale (Gradstein and others, 1994; Ogg, 1995).