Taxonomy:
Distinguishing features:
Parent taxon (Pemma): Pentaliths with a central depression/perforation in each segment; often producing elevated, robust structures that are commonly observed in side view.
This taxon: Specimens which cannot be assigned to any established species
Farinacci & Howe catalog pages:
Search data:
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: same as genus
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: same as genus
Plot of occurrence data:
Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs O Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs O Steurbaut, E. & Nolf, D. (2021). The Mont-des-Récollets section (N France): a key site for the Ypresian-Lutetian transition at mid-latitudes – reassessment of the boundary criterion for the base-Lutetian GSSP. Geodiversitas. 43(11): 311-363. gsReferences:
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Pemma sp. compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-5-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1039 Go to Archive.is to create a permanent copy of this page - citation notes |
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