Globotruncana orientalis

Taxonomy

Original description: Test large, almost circular in outline, coiled in a relatively high trochospire; dorsal side broadly convex, ventral side flat although the chambers are very slightly inflated; equatorial periphery almost circular, slightly lobate; axial periphery angular, acute, with 2 heavily beaded keels on the early chambers of the last whorl, reduced to a single well-developed, distinctly beaded keel in the last chambers; chambers on the dorsal side arranged in 3 dextrally coiled whorls and slowly and regularly increasing in size; the initial chambers are small, inflated and elongated in the direction of coiling, the last whorl is composed of 6 large, typically crescentic chambers; on the ventral side of the chambers are 6, heavily beaded horseshoe-shaped rims, and increase so slowly in size that they thickened and heavily beaded; umbilicus roughly hexagonal in outline, wide, deep, surrounded by slightly raised, heavily beaded ridges, and covered by interiomarginal, umbilical; tegilla with accessory apertures only poorly preserved; wall calcareous, perforate, except for the imperforate keels.

Entries in the Catalog of original descriptions: Globotruncana orientalis, Globotruncana poststephensoni, Globotruncana samuriensis, Globotruncana stephensoni

Geological Range:
Last occurrence (top): within G. gansseri zone (71.73-73.80Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. elevata zone (79.33-83.65Ma, base in Campanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Globotruncana orientalis, synonyms included - Globotruncana lakrai; Globotruncana orientalis; Globotruncana poststephensoni; Globotruncana samurensis; Globotruncana stephensoni; Marginotruncana stephensoni;
• See also space-time plot :: Samples map :: Parent: Globotruncana

Globotruncana orientalis compiled by the pforams@mikrotax project team viewed: 8-3-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110169 Go to Archive.is to create a permanent copy of this page - citation notes

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