Biblioteca de la Universidad Complutense de Madrid

The palynological record across the Cretaceous-Tertiary boundary in differing palaeogeographical settings from the southern Pyrenees, Spain

Impacto



Fernández Marrón, María Teresa y López Martínez, Nieves y Fonollá Ocete, José Fernando y Valle-Hernández, M.F (2004) The palynological record across the Cretaceous-Tertiary boundary in differing palaeogeographical settings from the southern Pyrenees, Spain. In The palynology and micropalaeontology of Boundaries. Special Publications. Geological Society of London, 230 (230). Geological Society of London, Londres, pp. 243-255. ISBN 1-86239-160-2

[img] PDF
4MB

URL Oficial: http://www.geolsoc.org.uk/gsl/publications/books/sp



Resumen

North American and Pacific spore-pollen records show a major extinction event at the
Cretaceous Tertiary (K-T) boundary, and abrupt changes are similarly found in many marine
organisms world-wide. In contrast, records from the Old World reveal little evidence of
terrestrial vegetational change across the boundary. In order to improve the characterization of
changes across the K-T boundary, palynological assemblages from two sections in the southern
Pyrenees have been evaluated. The abundance and diversity of trilete fern spores are high in
Maastrichtian samples and show a statistically significant decrease during the Danian. The 'fern
spike' of low-diversity spores found elsewhere is not recorded in the Pyrenean region. Minor
replacements of taxa across the K-T boundary are also noted, as well as an increase in
inaperturate gymnosperm pollen in the Danian. Comparing our two examined sections with one
another reveals important differences in angiosperm pollen composition.


Tipo de documento:Sección de libro
Materias:Ciencias > Geología > Paleontología
Código ID:9981
Depositado:27 Jul 2010 10:32
Última Modificación:27 Jul 2010 10:32

Sólo personal del repositorio: página de control del artículo