Distinguishing features: Bicyclic loxolith with broad, bright inner cycle, diamond-shaped central-area and cross bars that are relatively narrow, parallel-sided and lack any striations or median extinction line.
Taxonomy:
Farinacci & Howe catalog pages: B. glabra * , E. paragogus *
Distinguishing features: Bicyclic loxolith with broad, bright inner cycle, diamond-shaped central-area and cross bars that are relatively narrow, parallel-sided and lack any striations or median extinction line.
Morphology: Distinguished from Broinsonia by its smooth margin and outer wall cycle (which flares quite markedly in the LM). It is distinguished from Eiffellithus monechiae and Eiffellithus eximius by the relatively simple appearance of its cross in XPL.
Most likely ancestor: Staurolithites angustus - at confidence level 3 (out of 5). Data source: Watkins & Bergen 2003.
Search data:Tags | LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, plate, process, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Metrics | Lith size: 6->8µm; Data source notes: original description (of S. glabra) & illustrated specimens |
See also: Broinsonia matalosa ;
Geological Range:
Last occurrence (top): in mid part of UC1c subzone (50% up, 99.1Ma, 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
Plot of occurrence data:
Bergen, J. A. (1998). Calcareous nannofossils from the lower Aptian historical stratotype at Cassis-La Bedoule (SE France). Geologie Mediterraneenne. 25(3-4): 227-255. gs V O Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs V O Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs Burnett, J. A. (1997c). New species and new combinations of Cretaceous nannofossils and a note on the origin of Petrarhabdus (Deflandre) Wise & Wind. Journal of Nannoplankton Research. 19(2): 133-146. gs V O 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 Gale, A. S. et al. (2011). The uppermost Middle and Upper Albian succession at the Col de Palluel, Hautes-Alpes, France: An integrated study (ammonites, inoceramid bivalves, planktonic foraminifera, nannofossils, geochemistry, stable oxygen and carbon isotopes, cyclostratigraphy). Cretaceous Research. 32: 59-130. 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 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 Robaszynski, F. et al. (1993). Le Cénomanien de la région de Kalaat Senan (Tunisie centrale): Litho-biostratigraphie et interprétation séquentielle. Revue de Paléobiologie. 12(2): 351-505. gs Roth, P. H. & Thierstein, H. R. (1972). Calcareous nannoplankton: Leg 14 of the Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 12: 546-559. gs V O Watkins, D. K. & Bergen, J. A. (2003). Late Albian adaptive radiation in the calcareous nannofossil genus Eiffelithus. Micropaleontology. 49(3): 231-252. gsReferences:
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Eiffellithus paragogus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-3-2021
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