I. Arenillas et Ja. Arz, Parvularugoglobigerina eugubina type-sample at Ceselli (Italy): Planktic foraminiferal assemblage and lowermost Danian biostratigraphic implications, RIV IT PAL, 106(3), 2000, pp. 379-390
Citations number
40
Categorie Soggetti
Earth Sciences
Journal title
Rivista italiana di paleontologia e stratigrafia (Testo stampato)
The Parvularugoglobigerina eugubina Biozone (lowermost Danian) was defined
at Gubbio (Italy) to precisely characterise the Cretaceous/Paleogene (WP) b
oundary. It was defined by the total range of Pv. eugubina, but this small
morphospecies presents some taxonomic problems. The Pv. eugubina holotype a
nd the planktic foraminiferal assemblage of the Pv. eugubina type-sample at
Ceselli (Ceselli 3) were revised to precise the biostratigraphic posit ion
of this biozone. Of the 21 morphospecies identified in Ceselli 3, 14 are e
arly Paleocene species and 7 are possible Cretaceous "survivors" of the K/P
boundary extinction event. To clarify the lowermost Danian biozonation, it
was necessary to taxonomically revise Pv. eugubina and Pv. longiapertura,
which have both been identified in this sample. Following the definition of
Pv, eugubina and the original definition of the nominal biozone, the base
of Pv. eugubina Biozone should be placed at the first appearance datum of t
he eponymous species and not at the first appearance datum of Pv. longiaper
tura.