Nannotax3 - ntax_cenozoic - Micrantholithus attenuatus

Citation: Micrantholithus attenuatus Bramlette & Sullivan, 1961

Variants:

Micrantholithus articulatus Bukry & Percival, 1971 - ray tips with complex sutures
Micrantholithus aequalis Sullivan, 1964 - described as smaller (9-14 µm) and more symmetric than M. attenuatus
Micrantholithus inaequalis Martini, 1961 - segments asymetric, one ray half long than the other.

Distinguishing features: Stellate Micrantholithus with deeply indented sides and gracile, long rays.

Geological Range:
Last occurrence (top): within NP23 zone (29.62-32.02Ma, top in Rupelian stage). Data source: [PRB rough estimate]
First occurrence (base): within NP9 zone (55.86-57.21Ma, base in Thanetian stage). Data source: Bown 2005

References:

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

Bown, P. R. (2010). Calcareous nannofossils from the Paleocene/Eocene Thermal Maximum interval of southern Tanzania (TDP Site 14). Journal of Nannoplankton Research. 31(1): 11-38. gs V O

Bramlette, M. N. & Sullivan, F. R. (1961). Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology. 7(2): 129-188. gs

Bukry, D. & Percival, S. F. (1971). New Tertiary calcareous nannofossils. Tulane Studies in Geology and Paleontology. 8: 123-146. gs V O

Martini, E. (1961). Nannoplankton aus dem Tertiär und der obersten Kreide von SW-Frankreich. Senckenbergiana Lethaea. 42: 1-32. gs

Self-Trail, J. (2011). Paleogene Calcareous Nannofossils of the South Dover Bridge core, Southern Maryland (USA). Journal of Nannoplankton Research. 32(1): 1-28. gs V O

Sullivan, F. R. (1964). Lower Tertiary nannoplankton from the California Coast Ranges. I. Paleocene. University of California Publications in Geological Sciences. 44: 163-227. gs

Tags	LITHS: nannolith-radiate, pentagonal, star-shaped, CROSS-POLARS: T-prominent,
Metrics	Lith size: 10->30µm; Segments: 5->5; Liths per sphere: 12->12 Data source notes: lith size (diameter) from ODs & illustrated specimens; lith numbers assumed from geometry

Micrantholithus attenuatus

References:

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