Distinguishing features: Large elliptical Pontosphaera with small pores and two central longitudinal holes separated by conjunct bar. The plate thickens towards the edge but the rim is difficult to distinguish in XPL.
Farinacci & Howe catalog pages: Pontosphaera perforomarginata *
Morphology remarks: The plate thickens towards the edge but the rim is difficult to distinguish in XPL.
|Tags||LITHS: murolith, elliptical, RIM: outer wall acw-imbricate, CA: bar-diagonal, bar-diagonal NW-SE, pores, bar, |
CSPH: not known, V-UNITS: outer-rim, V-prominent, R-UNITS: c-str, inner-rim, px-plate, R-prominent, DETAILS: ca_conjunct, rim-bicyclic, isogyres oblique, isogyres separated,
|Metrics||Lith size: 7->10µm; |
Sources: lith size from OD and slightly extended
Last occurrence (top): within NP11 zone (53.70-54.17Ma, top in Ypresian stage). Data source: Bown 2005
First occurrence (base): within NP11 zone (53.70-54.17Ma, base in Ypresian stage). Data source: Bown 2005
Plot of occurrence data:
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