Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium sized, with wide rim and no spine, weakly asymmetric
Taxonomy:
Farinacci & Howe catalog pages: R. eboracensis *
Distinguishing features:
Parent taxon (Rhagodiscus): Loxolith coccoliths with low rim and central-area filled by a granular plate which may be perforate and/or spine-bearing. In xpl the rim is unicyclic moderately bright, the central area is granular, lacking a clear extinction cross.
This taxon: Medium sized, with wide rim and no spine, weakly asymmetric
Search data:
LITHS: murolith, elliptical, CA: plate, CROSS-POLARS: rim-unicyclic, R-prominent, |
Lith size: 6->7µm; Data source notes: original description & illustrated specimens |
Geological Range:
Last occurrence (top): within Hauterivian Stage (126.50-132.60Ma, top in Hauterivian stage). Data source: Original description
First occurrence (base): within Hauterivian Stage (126.50-132.60Ma, base in Hauterivian stage). Data source: Original description
Plot of occurrence data:
Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs Wind, F. H. & Cepek, P. (1979). Lower Cretaceous calcareous nannoplankton from DSDP Hole 397A (northwest African Margin). Initial Reports of the Deep Sea Drilling Project. 47A: 221-235. gs References:
Rhagodiscus eboracensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11020 Go to Archive.is to create a permanent copy of this page - citation notes |
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