Chapter E4 A tethyan reference record for the Campanian and Maastrichtian stages: The Bottaccione section (Central italy); review of data and new calcareous nannofossil results

Published on Jan 1, 2001in Developments in Palaeontology and Stratigraphy
· DOI :10.1016/S0920-5446(01)80065-0
S. Gardin1
Estimated H-index: 1
F. Del Panta1
Estimated H-index: 1
+ 1 AuthorsM. Pozzi1
Estimated H-index: 1
Sommaire Ce chapitre fait le point sur l'eventail des donnees stratigraphiques publiees sur la section du Bottaccione (un cours d'eau de Marcho-Ombrie, Italie centrale) pour les etages Campanien et Maastrichtien. L'occasion a ete saisie pour reviser la biostratigraphie des nannofossiles calcaires. La section du Bottaccione, dont l'importance est cruciale en stratigraphie du Cretace et du Paleogene, a ete etudiee depuis le debut des annees 60: lithologie, sedimentologie, geochimie (elements en trace et isotopes stables), magnetostratigraphie, biostratigraphie: surtout micro- et nannoplancton calcaire. C'est l'excellent enregistrement paleomagnetique qui fait de cette section une succession de reference a terre pour la magnetostratigraphie du Cretace Superieur a l'Eocene Superieur. La biostratigraphie amelioree des nannofossiles calcaires est presentee dans ce chapitre pour les niveaux du Santonien au Maastrichtien. Deux tendances evolutives peuvent aussi etre suivies dans cette section, celle d' Aspidolithus parcus et celle d' Arkhangelskiella cymbiformis . La correlation avec la recente revision des foraminiferes planctoniques (Premoli Silva & Sliter, 1995), ameliore la resolution stratigraphique de cet intervalle de temps aux basses latitudes. La section du Bottaccione est un exemple de biostratigraphie integree des nannofossiles calcaires et des foraminiferes planctoniques renforcee par un cadre magnetostratigraphique solide. Cette combinaison d'information permet de completer l'integration d'outils stratigraphiques moins bien connus a Tercis (paleomagnetisme, geochimie) avec ceux qui y sont mieux representes (macrofaune, dinoflagelles) et de mieux definir ainsi la position de la limite Campanien-Maastrichtien.
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