Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: Eprolithid with narrow wall (formed from 16-24 small, brick-like elements) surrounding a wide central area spanned by an amedian diaphragm.
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Farhania varolii Eprolithid with narrow wall (formed from 16-24 small, brick-like elements) surrounding a wide central area spanned by an amedian diaphragm. | ||
Farhania sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Farhania *
Distinguishing features:
Parent taxon (Polycyclolithaceae): Nannoliths composed of two superposed wall cycles and a central-area which may be closed, open and vacant, or spanned by a diaphragm-like structure. Elements have tangential c-axis orientation.
This taxon: Eprolithid with narrow wall (formed from 16-24 small, brick-like elements) surrounding a wide central area spanned by an amedian diaphragm.
Search data:
LITHS: nannolith-radiate, circular, cylindrical, CA: closed, CROSS-POLARS: T-prominent, |
Lith size: 4->8µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of BC21 zone (100% up, 114.6Ma, in Aptian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within BC19 zone (119.02-119.20Ma, base in Aptian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O Varol, O. (1992). Taxonomic revision of the Polycyclolithaceae and its contribution to Cretaceous biostratigraphy. Newsletters on Stratigraphy. 27(93-127): -. gsReferences:
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Farhania compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-4-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10445 Go to Archive.is to create a permanent copy of this page - citation notes |
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