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  Paleontology
Calcareous Nannofossils of Iran
Author : Fatemeh Hadavi
Publisher date : October 2002
Chapter title : First Chapter - Nannofossils
Data title : Pontosphaerids

4) Pontosphaerids: members of Pontosphaeraceae have oval coccolithus which have two joined shields to each other. Distal shield results in big appearance of wall and so it looks basket shape.

Central area are both closed and perforated and or it has been extended by a relief.

This group is index of Cenozoic (fig 16).

 

 


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