Distinguishing features: Cavate with thin basal plate and thick flaring walls extending to one-third the height of the specimen; domed distal cover showing perforations. The basal plate, walls and dome are crystallographically continuous and bright at 45° in XPL, darkening slightly when rotated to 0°. The central cavate opening is almost circular in side view.
Farinacci & Howe catalog pages: D. basilica *
Morphology: Daktylethra basilica differs from D. unitatus (also from Zone NP 16) in having a thicker walls that extends away from the central dome and in having an almost perfectly circular central cavity. NB DEscrition of Self-Trail (2011) slightly edited to conform better with terminlogy used here to describe the other species of Daktylethra.
|Tags||LITHS: holococcolith, elliptical, hollow, CA: pores, closed, CROSS-POLARS: 1ou, V-prominent,|
|Metrics||Lith size: 3->5µm; |
Data source notes: lith size from OD
Last occurrence (top): within NP16 zone (40.40-42.87Ma, top in Bartonian stage). Data source: Self-Trail 2011
First occurrence (base): within NP16 zone (40.40-42.87Ma, base in Lutetian stage). Data source: Self-Trail 2011
Plot of occurrence data:
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