Nannotax3 - ntax_mesozoic - Gartnerago nanum

Gartnerago nanum


Classification: ntax_mesozoic -> Arkhangelskiales -> Kamptneriaceae -> Gartnerago -> Gartnerago nanum
Sister taxa: G. obliquum, G. segmentatum, G. costatum, G. diversum ⟩⟨ G. stenostaurion, G. clarusora, G. waszczakii ⟩⟨ G. chiasta, G. margaritatus, G. praeobliquum ⟩⟨ G. coxalliae, G. nanum, G. ponticula, G. theta, G. sp.

Distinguishing features:
Parent taxon (Gartnerago): Tiered coccoliths with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures variable but generally dark in LM.
This taxon: Medium-sized Gartnerago with a loxolith-type rim and a narrow, perforate central area plate, which has differentiated axial bars, although the longitudinal bar may be subordinate or poorly defined.


Taxonomy:

Citation: Gartnerago nanum Thierstein, 1974
Rank: Species

Farinacci & Howe catalog pages: G. nanum *

Distinguishing features:
Parent taxon (Gartnerago): Tiered coccoliths with distinctive LM images consisting of a narrow to moderately-broad rim with a narrow, dark outer-cycle; a diagnostic, bright median-cycle; and a dark, inner-cycle. Central-area structures variable but generally dark in LM.
This taxon: Medium-sized Gartnerago with a loxolith-type rim and a narrow, perforate central area plate, which has differentiated axial bars, although the longitudinal bar may be subordinate or poorly defined.


Size: Length 6.5-7.5 µm

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial, grill, bar, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 6->10µm;
Data source notes: original description (max may be a bit high)
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of UC3c subzone (100% up, 94.8Ma, in Cenomanian stage). Data source: Burnett 1998 (zonal marker)
First occurrence (base): at base of UC1a subzone (0% up, 100.5Ma, in Albian stage). Data source: Burnett 1998

Plot of occurrence data:

References:

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O

Crux, J. A. (1980). A biostratigraphical study of Upper Cretaceous nannofossils from South-east England and North France. PhD thesis, University College London. -. gs

Jeremiah, J. (1996). A proposed Albian to Lower Cenomanian nannofossil biozonation for England and the North Sea Basin. Journal of Micropalaeontology. 15(97-129): -. gs V O

Püttmann, T., Mutterlose, J., Kaplan, U. & Scheer, U. (2019). Reworking of Cenomanian ammonites decoded by calcareous nannofossils (southern Münsterland Basin, northwest Germany). Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291(1): 1-17. gs

Thibault, N. (2010). Calcareous nannofossils from the boreal Upper Campanian- Maastrichtian chalk of Denmark. Journal of Nannoplankton Research. 31(1): 39-56. gs V O

Thierstein, H. R. (1974). Calcareous nannoplankton - Leg 26, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 26: 619-667. gs V O


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Gartnerago nanum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-11-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10464 Go to Archive.is to create a permanent copy of this page - citation notes



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