Taxonomy:
Distinguishing features:
Parent taxon (Lithostromation): Triangular to stellate nannoliths with porous structure formed from small crystallites. All show 3-fold symetry but with a wide range of forms.
This taxon: 3 co-planar broad, bifurcate rays, large size (12-22 µm)
Farinacci & Howe catalog pages: T. tripartitus *
Size:
Lith size: 0->0µm; |
Geological Range:
Last occurrence (top): within Early Oligocene Sub-Epoch (28.09-33.89Ma, top in Rupelian stage). Data source: Martini 1988
First occurrence (base): within Early Oligocene Sub-Epoch (28.09-33.89Ma, base in Rupelian stage). Data source: Martini 1988
Plot of occurrence data:
Martini, E. (1988). Nannoplankton-Massenvorkommen in den Corbicula-(=Schichten mit Hydrobia inflata) und Hydrobienschichten des Oberrheingrabens, des Mainzer und des Hanauer Beckens (Miozän). Geologisches Jahrbuch. A110: 205-227. gs Martini, E. (1998). A new stratigraphically important Trochoaster species (nannoplankton) of the Middle Pechelbronn Formation (Lower Oligocene). Mainzer naturwissenschaftliches Archiv-Beheft. 104: 165-172. gsReferences:
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Trochoaster tripartitus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-5-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1844 Go to Archive.is to create a permanent copy of this page - citation notes |
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