Nannotax3 - ntax_mesozoic - Biscutum gaultensis

Distinguishing features: Small (4-5 µm), with well-developed central area with birefringent axial structure.

Citation: Biscutum gaultensis (Mutterlose, 1992) Bown in Kennedy et al., 2000

Basionym: Seribiscutum gaultensis Mutterlose, 1992

Distinguishing features: Small (4-5 µm), with well-developed central area with birefringent axial structure.

Morphology: From the original description - "The central area is nearly filled by at least four platelike elements that are interrupted in the center by a pore. The central elements are discernible under the light microscope and form a distinctive extinction pattern"

Geological Range:
Last occurrence (top): in mid part of UC5a subzone (50% up, 94.3Ma, in Cenomanian stage). Data source: Burnett 1998, fig. 6.2
First occurrence (base): within Aptian Stage (112.95-126.30Ma, base in Aptian stage). Data source: Burnett 1998

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

Gale, A. S., Kennedy, W. J., Burnett, J. A., Caron, M. & Kidd, B. E. (1996). The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). Cretaceous Research. 17: 515-606. gs

Hardas, P. & Mutterlose, J. (2008). Calcareous nannofossil assemblages of Oceanic Anoxic Event 2 in the equatorial Atlantic: Evidence of an eutrophication event. Marine Micropaleontology. 66: 52-69. gs

Kennedy, W. J. et al. (2000). Integrated stratigraphy across the Aptian-Albian boundary in the Marnes Bleues, at the Col de Pre _-Guittard, Arnayon (Drome), and at Tartonne (Alpes-de-Haute-Provence), France: a candidate Global Boundary Stratotype Section and Boundary Point for the base of the Albian Stage. Cretaceous Research. 21: 591-720. gs

Mutterlose, J. (1992b). Lower Cretaceous nannofossil biostratigraphy off northwestern Australia (Leg 123). Proceedings of the Ocean Drilling Program, Scientific Results. 123: 343-368. gs V O

Tags	LITHS: placolith, elliptical, CA: ca_disjunct, closed, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
Metrics	Lith size: 4->5µm; Data source notes: original description

Biscutum gaultensis

References:

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