Taxonomy:
it is also similar to Micrantholithus angulosus - but with simpler ray tips. Finally Pemma basquense is similar but with the bifurcations touching.
Distinguishing features: Micrantholithus with relatively straight edges and raised ridges around the sutures that widen at their ends.
Farinacci & Howe catalog pages: M. bulbosus * , M. ornatus *
See also: Pemma basquense - similar morphotype in Pemma;
Search data:Tags | LITHS: nannolith-radiate, pentagonal, star-shaped, CA: process, CROSS-POLARS: T-prominent, |
Metrics | Lith size: 5->15µm; Segments: 5->5; Liths per sphere: 12->12 Data source notes: lith size (diameter) from ODs & illustrated specimens; lith numbers assumed from geometry |
Geological Range:
Last occurrence (top): within NP15b subzone (44.12-45.49Ma, top in Lutetian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP14b subzone (46.29-47.84Ma, base in Lutetian stage). Data source: [PRB rough estimate]
Plot of occurrence data:
Bouché, P. M. (1962a). Nannofossiles calcaires de Lutétien du Bassin de Paris. Revue de Micropaléontologie. 5: 75-103. gs Bown, P. R. (2005d). Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). Journal of Nannoplankton Research. 27(1): 21-95. gs V O Bybell, L. M. & Gartner, S. (1972). Provincialism among mid-Eocene calcareous nannofossils. Micropaleontology. 18(319-336): -. gs Bybell, L. (1975). Middle Eocene calcareous nannofossils at Little Stave Creek, Alabama. Tulane Studies in Geology and Paleontology. 11(4): 177-247. gs V O Stradner, H. & Papp, A. (1961). Tertiäre Discoasteriden aus Österreich und deren stratigraphische Bedeutung mit Hinweisen auf Mexico, Rumanien und Italien. Jahrbuch der Geologischen Bundesanstalt, Sonderband. 7: 1-159. gs V O Stradner, H. (1959a). Die fossilen Discoasteriden Osterreichs. II. Erdoel-Zeitschrift. 75(12): 472-488. gs Sullivan, F. R. (1965). Lower Tertiary nannoplankton from the California Coast Ranges. II. Eocene. University of California Publications in Geological Sciences. 53: 1-74. gsReferences:
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Micrantholithus bulbosus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-3-2021
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