Distinguishing features: Circular placoliths with moderately birefringent shields, a bright inner tube cycle and narrow or closed central areas.
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | Markalius inversus Markalius with closed central area. | |||
Markalius vetulus Medium sized (6-7.5 µm), tube cycle very bright and individual elements not visible | ||||
![]() | ![]() | Markalius sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Markalius + *
Distinguishing features: Circular placoliths with moderately birefringent shields, a bright inner tube cycle and narrow or closed central areas.
Search data:Tags | LITHS: placolith, circular, CA: closed, CROSS-POLARS: rim-unicyclic, V-prominent, |
Metrics | Lith size: 6->9µm; Data source notes: size range of included species |
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 Valanginian Stage (0% up, 139.4Ma, in Valanginian 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. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs V O Deflandre, G. & Fert, C. (1954). Observations sur les coccolithophoridés actuels et fossiles en microscopie ordinaire et électronique. Annales de Paléontologie. 40: 115-176. gsReferences:
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Markalius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2021
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