Distinguishing features: Subcircular with very high rim; central-area narrow, with grill.
|Daughter taxa (time control age-window is: 0-800Ma)|
One cycle regular, the other appears to be a hemispherical mass of spines
Both cycles regular, grill in central area.
Specimens not identified to species level.
Farinacci & Howe catalog pages: Cribrocorona *
Distinguishing features: Subcircular with very high rim; central-area narrow, with grill.Search data:
|Tags||LITHS: placolith, circular, cylindrical, hollow, CA: ca_disjunct, grill, vacant, closed, CROSS-POLARS: rim-unicyclic, R-prominent,|
|Metrics||Lith size: 4->10µm; |
Data source notes: size range of included species
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): near base of Santonian Stage (5% up, 86.1Ma, in Santonian stage). Data source: Total of range of species in this database
Plot of occurrence data:
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