Distinguishing features: Relatively small (<~5µm), subcircular, elliptical or cylindrical nannoconids with relatively narrow canals (ct < wt).
Daughter taxa: (blue => in age window 0-800Ma) | ||||
![]() | ![]() | ![]() | ![]() | Nannoconus compressus Rectangular to oval with narrow canal |
![]() | ![]() | Nannoconus puer Elliptical to subcircular with relatively narrow canal (less than wall thickness). |
Taxonomy:
Farinacci & Howe catalog pages: N. infans group [no catalog entry yet]
Distinguishing features: Relatively small (<~5µm), subcircular, elliptical or cylindrical nannoconids with relatively narrow canals (ct < wt).
Search data:Tags | LITHS: nannolith-radiate, circular, cylindrical, hollow, CA: vacant, CROSS-POLARS: T-prominent, |
Metrics | Lith size: 3->8µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Berriasian Stage (100% up, 139.4Ma, in Berriasian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Tithonian Stage (0% up, 152.1Ma, in Tithonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Casellato, C. E. (2010). Calcareous nannofossil biostratigraphy of Upper Callovian - Lower Berriasian successions from the Souhern Alps, North Italy. Rivista Italiana di Paleontologia e Stratigrafia. 116(3): 357-404. gs V O Varol, O. & Bowman, A. R. (2019). Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 291: 65-87. gsReferences:
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N. compressus group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 21-1-2021
Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10713 Go to Archive.is to create a permanent copy of this page - citation notes |