Publication: The Global Boundary Stratotype Section and Point (GSSP) of the Toarcian-Aalenian Boundary (Lower-Middle Jurassic)
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Publication Date
2001
Authors
Cresta, S.
Goy, Antonio
Arias Fernández, María del Carmen
Barrón López, Eduardo
Bernard García, Julio
Gialanella, P.R.
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Publisher
International Union of Geological Sciences
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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).