Distinguishing features:
Parent taxon (Calcivascularis): Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.
This taxon: Small Calcivascularis with a high number of rim elements, sub-parallel walls, and a circular horizontal outline.
Taxonomy:
Farinacci & Howe catalog pages: C. cassidyi *
Distinguishing features:
Parent taxon (Calcivascularis): Protolith coccoliths with high rim, inner rim cycle not clearly developed, upper part of coccolith filled by mass of radiating elements.
This taxon: Small Calcivascularis with a high number of rim elements, sub-parallel walls, and a circular horizontal outline.
Search data:
LITHS: murolith, circular, cylindrical, CA: ca_disjunct, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent, |
Lith size: 2->5µm; Data source notes: original description |
See also: Conusphaera mexicana subsp. minor - similar co-eval species, but with different central structure;
Geological Range:
Last occurrence (top): within Kimmeridgian Stage (149.24-154.78Ma, top in Kimmeridgian stage). Data source: original description
First occurrence (base): within Kimmeridgian Stage (149.24-154.78Ma, base in Kimmeridgian stage). Data source: original description
Plot of occurrence data:
Bergen, J. A., Boesiger, T. M. & Pospichal, J. J. (2014). Low-latitude Oxfordian to Early Berriasian nannofossil biostratigraphy and its application to the subsurface of Eastern Texas. In, Hammes, U. & Gale, J. (eds) Geology of the Haynesville Gas Shale in East Texas and West Louisiana, U.S.A. American Association of Petroleum Geologists, Memoirs . 105: 69-102. gsReferences:
Calcivascularis cassidyi 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=10161 Go to Archive.is to create a permanent copy of this page - citation notes |
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