Distinguishing features: Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.
| Daughter taxa: (blue => in age window 0-800Ma) | ||||
| | | | Markalius with open central area. |
| | | | Markalius with closed central area. |
| | | | Markalius species with wide, but closed, central area |
| | Markalius with very narrow tube cycle and closed central area. | ||
| | | | Specimens which cannot be assigned to any established species |
Taxonomy:
Farinacci & Howe catalog pages: Markalius + *
Distinguishing features: Circular placoliths with moderately birefringent shields, bright inner tube cycle and narrow or closed central areas.
Size: All desribed species are of similar size - coccoliths 5-10 µm across.
| Tags | LITHS: placolith, circular, CSPH: spherical, monomorphic, V-UNITS: distal shield, R-UNITS: inner-tube, prox shield, DETAILS: rim-bicyclic, |
| Metrics | Lith size: 5->10µm; Sources: |
Geological Range:
Last occurrence (top): in lower part of Rupelian Stage (17% up, 32.9Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Campanian Stage (0% up, 83.6Ma, in Campanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Bramlette, M.N. & Martini, E., (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology, 10(2): 291-322.GS Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.GSReferences:
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Markalius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-4-2019
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