Distinguishing features:
Parent taxon (Prediscosphaera):
This taxon: Circular Prediscophaera species
Daughter taxa (time control age-window is: 0-800Ma) | ||||
Prediscosphaera columnata Circular to sub-circular, small; narrow inner-rim cycle | ||||
Prediscosphaera ponticula Circular to sub-circular; medium-sized; broad rim; cross with secondary bars |
Taxonomy:
Farinacci & Howe catalog pages:
Distinguishing features:
Parent taxon (Prediscosphaera):
This taxon: Circular Prediscophaera species
Search data:
LITHS: placolith, circular, CA: ca_disjunct, |
Lith size: 4->9µm; Segments: 16->16; Data source notes: size range of included species |
Geological Range:
Notes: This group is characteristic of the earlier part of the range of Prediscosphaera
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 Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
P. columnata group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10845 Go to Archive.is to create a permanent copy of this page - citation notes |
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