Distinguishing features:
Parent taxon (Arkhangelskiellaceae): Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.
This taxon: Similar to Broinsonia but with well-developed central spine
Daughter taxa (time control age-window is: 0-800Ma) | ||||
Thiersteinia ecclesiastica | ||||
Thiersteinia sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Thiersteinia *
Distinguishing features:
Parent taxon (Arkhangelskiellaceae): Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.
This taxon: Similar to Broinsonia but with well-developed central spine
Search data:
LITHS: placolith, elliptical, CA: cross-axial, plate, pores, process, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 8->10µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of UC11b subzone (100% up, 85.8Ma, in Coniacian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC8a subzone (90.23-90.36Ma, base in Turonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Wise, S. W. (1983). Mesozoic and Cenozoic calcareous nannofossils recovered by DSDP Leg 71 in the Falkland Plateau region, Southwest Atlantic Ocean. Initial Reports of the Deep Sea Drilling Project. 71: 481-550. gs OReferences:
Thiersteinia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11214 Go to Archive.is to create a permanent copy of this page - citation notes |
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