Trace fossils and facies changes in Cretaceous-Eocene flysch deposits of the Julian Prealps (Italy and Slovenia): Consequences of regional and world-wide changes
Titel:
Trace fossils and facies changes in Cretaceous-Eocene flysch deposits of the Julian Prealps (Italy and Slovenia): Consequences of regional and world-wide changes
Auteur:
Tunis, Giorgio Uchman, Alfred
Verschenen in:
Ichnos
Paginering:
Jaargang 4 (1996) nr. 3 pagina's 169-190
Jaar:
1996-04
Inhoud:
The abundance and diversity of flysch trace fossil assemblages, including graphoglyptids and forms produced by echinoids, as well as the ratio of pre-depositional to post-depositional forms, show distinct large-scale changes through the Maastrichtian to Eocene in the Julian Prealps. The changes were related to general facies changes and controlled by sedimentation rate, degree of erosion of the deep-sea floor, substrate properties, oxygenation of the sediment, and food supply. The most significant changes occurred around the late Paleocene-early Eocene to early-middle Eocene boundaries and may be related to regional paleogeography and, tentatively, worldwide climate, especially to changes of temperature, fertility, and oxygenation of deep-sea waters.
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