Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | ![]() | Cribrocorona echinus One cycle regular, the other appears to be a hemispherical mass of spines | |
![]() | ![]() | Cribrocorona gallica Both cycles regular, grill in central area. | ||
Cribrocorona sp. Specimens not identified to species level. |
Taxonomy:
Distinguishing features:
Parent taxon (Axopodorhabdaceae): Regular placoliths; central-area, with cross-bars or perforated plate; often with tall, hollow spines.
Distal shield elements non-imbricate V-units; proximal shield and inner cycle formed from R-units. Rim often appears beaded in LM
This taxon: Subcircular with very high rim; central-area narrow, with grill.
Farinacci & Howe catalog pages: Cribrocorona *
Search data:
LITHS: placolith, circular, cylindrical, hollow, CA: ca_disjunct, grill, vacant, closed, CROSS-POLARS: rim-unicyclic, R-prominent, |
Lith size: 4->10µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC11c subzone (85.30-85.84Ma, base in Coniacian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs O Perch-Nielsen, K. (1973). Neue Coccolithen aus dem Maastrichtien von Danemark, Madagaskar und Agypten. Bulletin of the Geological Society of Denmark. 22: 306-333. gs References:
![]() |
Cribrocorona compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-6-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10305 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments