Calcicalathina


Classification: Mesozoic -> Eiffellithales -> Rhagodiscaceae -> Calcicalathina
Sister taxa: Calcicalathina, Percivalia, Rhagodiscus, Zebrashapka,

Distinguishing features: Muroliths (loxolith type) with high, narrow rim and wide central-area filled by a large, domed, granular mass.


Daughter taxa: (blue => in age window 0-800Ma)
Calcicalathina with narrow rim and central-area filled by a layered, granular mass. Seen in plan and side view. Layered central area structure is distinctive in XPL. Overall height is highly variable.
Calcicalathina with a low central area showing sharp distinction between rim (1st order yellow birefringence) and coarsely-granular central area
Calcicalathina with high, narrow rim and wide central-area filled by a large, domed, granular mass. Seen in plan and side view.
Specimens not identified to species level

Taxonomy:

Citation: Calcicalathina Thierstein, 1971
Rank: Genus
Type species: Schizosphaerella oblongata Worsley, 1971

Farinacci & Howe catalog pages: Calcicalathina *

Distinguishing features: Muroliths (loxolith type) with high, narrow rim and wide central-area filled by a large, domed, granular mass.

Geological Range:
Last occurrence (top): within Cenomanian Stage (93.90-100.50Ma, top in Cenomanian stage). Data source: Total of range of species in this database
First occurrence (base): within Berriasian Stage (139.39-145.01Ma, base in Berriasian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P.R.; Rutledge, D.C.; Crux, J.A. & Gallagher, L.T., (1998). Early Cretaceous. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 86-131. 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. GS

Thierstein, H.R. (1971). Tentative Lower Cretaceous Calcareous Nannoplankton Zonation. Eclogae Geologicae Helvetiae, 64: 459-488. GS


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Calcicalathina compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-5-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10150 Go to Archive.is to create a permanent copy of this page - citation notes



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