New interpretations of early Eocene calcareous nannofossil evolution
نویسندگان
چکیده
منابع مشابه
Late Albian adaptive radiation in the calcareous nannofossil genus Eiffellithus
Well preserved nannofossil assemblages in upper Albian and lower Cenomanian hemipelagic sections from Ocean Drilling Program (ODP) Leg 171B preserve a record of the early history and adaptive radiation of the genus Eiffellithus. Seven distinct taxa are recognized and differentiated, with one previously named taxon (E. monechiae) emended and four new species described: E. praestigium, E. vonsali...
متن کاملdiversity changes among calcareous nannofossil assemblages across the paleocene – eocene boundary in the zagros (southwest iran)
calcareous nannofossil assemblages of the boundary paleocene-eocene deposits (pabdeh formation) of the zagros, dezful embayment-mansouri oilfield have been studied in detail. it consists of shale and grey marlstone with inter layers of calcareous argillites and marly claystone. we present a study focused on changes in calcareous nannofossils of the pabdeh formation during the paleocene/eocene b...
متن کاملMajor shifts in calcareous phytoplankton assemblages through the EoceneOligocene transition of Tanzania and their implications for lowlatitude primary production
[1] A high-resolution record of exceptionally well preserved calcareous nannofossil assemblages from Tanzania is marked by two key transitions closely related to the climatic events of the Eocene-Oligocene transition (EOT). The first transition, at 34.0 Ma, precedes the first positive shift in dO and coincides with a distinct interval of very low nannofossil abundance and a cooling in sea surfa...
متن کاملBiostratigraphy and paleoecology of Paleogen rocks based on calcareous nannofossil in Kafaz section, east Iran
In this study, the assemblage of calcareous nannofossils has been investigated in long and continuous deposits from a Kafaz section in Eastern Iran. A systematic study of calcareous nannofossils has indicated 39 nannofossils species. In order to the age determination of Kafaz's deposits, a revised zonation for the Eocene is used. Based on it, the Early-Middle Eocene deposits of Kafaz section is...
متن کاملCalcareous nannofossil assemblages of the Late Campanian- Early Maastrichtian form Gurpi Formation (Dezful embayment, SW Iran): Evidence of a climate cooling event
A succession of Late Campanian- Early Maastrichtian is analyzed from Gurpi Formation with regard to the calcareous nannofossils. Correlation Matrix was applied for the first time to the entire nannofossil assemblage to reconstruct environmental conditions. A detailed quantitative calcareous nannofossil analyses is performed on samples in order to further investigate the climate events, and inte...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Paleontological Society Special Publications
سال: 1996
ISSN: 2475-2622,2475-2681
DOI: 10.1017/s2475262200000617