| The studied shallow marine sediments are situated south and southwest of Jiroft town,
180 km south of Keman, from the Tihoiyeh section (near Tihoiyeh village). These
deposits at the top of the section include marly limestones with index Nummulites
species such as N. perforatus (De Montfort), N. lyelli (D’Archiac and Haime).
According to Schaub’s nummulitic time scale (1981) and shallow benthic zonation of
Serra-Kiel et al. (1998), this interval referred to Bartonian age and SBZ17 zone,
respectively.
Also, the calcareous nannofossil study on this interval led to identification of
19 well-preserved species belonging to 11 genera of this plankton group. Based
on determined index calcareous nannofossiltaxa such as Reticulofenestra bisecta,
Sphenolithus obtusus, Sphenolithus intercalaris, Cribrocentrum erbae and associated
species such as Sphenolithus pseudoradians, Reticulofenestra wadeae, Cribrocentrum
reticulatum and Blackites spinosus this interval assigned to the CNE15 zone of Agnini et
al. (2014) that corresponds to upper part of NP16 and lower part of NP17 zones
of Martini (1971). It is resulted that, the detected shallow benthic foraminifera
zone, corresponds to the calcareous nannofossil zones both indicating Bartonian
age.
Keywords: Bartonian, Calcareous nannofossil, Nummulites, Central Iran, Tihoiyeh
section.
References:
Agnini, C., Fornaciari, E., Raffi, I, Rita Catanzariti, R., Palike, H., Backman,
J. and Rio, D., 2014. Biozonation and biochronology of Paleogene calcareous
nannofossils from low and middle latitudes. Newsletters on Stratigraphy, Vol. 47
(2), Pp. 131–181.
Martini, E., 1971. Standard Tertiary and Quaternary calcareous nannoplankton
zonation. In: Farinacci, A. (Ed.), Proceedings 2nd International Conference
Planktonic Microfossils Roma: Rome (Ed. Tecnosci.), 2, Pp. 739-785.
Serra-Kiel, J., Hottinger, L., Caus, E., Drobne, K., Fernandez, C., Jauhri,
A.K., Less, G., Pavlovec, R., Pignatti, J., Samso, J.M., Schaub, H., Sirel, E.,
Strougo, A., Tambareau, Y., Tosquella, Y. &Zakrevskaya, E., 1998. Larger
foraminiferal biostratigraphy of the Tethyan Paleocene and Eocene. Bulletin de
la SociétéGéologique de France, 169, Pp. 281-299.
Shaub, H., 1981. Nummuliteses Assilines de la Tethys Paleogene. Memoires
sussesde Paleontologie, vol. 104- 106, Pp. 354. |