The Global Boundary Stratotype Section and Point (GSSP) of the Toarcian-Aalenian Boundary (Lower-Middle Jurassic)

Cresta, S.; Goy Goy, Antonio; Ureta Gil, María Soledad; Arias Fernández, María Del Carmen; Barrón López, Eduardo; Bernard García, Julio; Canales Fernández, María Luisa; García Joral, Fernando; García Romero, Emilia; Gialanella, P.R.; Gómez Fernández, Juan José; González, J.A.; Herrero Matesanz, M. De La Concepción; Martínez Gutiérrez, Gemma; Osete López, María Luisa; Perilli, Nicola; Villalaín, J.J.

The Global Boundary Stratotype Section and Point (GSSP) of the Toarcian-Aalenian Boundary (Lower-Middle Jurassic)

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Publication date

2001

Publisher

International Union of Geological Sciences

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https://hdl.handle.net/20.500.14352/57584

Abstract

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).