 Hornibrook et al. 1989, Fig. 25.4a-c: 0.44 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.125, Fig. 25:4a-c.
Synonymy: 1939, Globigerinoides index, Trans. Roy. Soc. N.Z. 69(1): 125, pl. 14, fig. 85- 88;
1958, Hornibrook, Micropaleontology 4(1): 34, pl. 1, fig. 11-14;
1961, Globigerapsis index, Hornibrook, N.Z. Geol. Surv. paleont. bull. 34(1): 152, 153;
1971, Globigerinatheca (Globigerapsis) index, Jenkins, N.Z. Geol. Surv. paleont. bull. 42: 187, 188, pl. 22, fig. 641-645.
Description: Distinguished by the stout subspherical form with three subspherical chambers in the final whorl; sutures deeply incised; often two lipped apertures with or without bullae; surfaces coarsely porous and reticulate. Individuals with apertural bullae are often separated as Globigerinatheca barri.
Distribution: Topmost Porangan (rare, atypical), Bortonian to Runangan.
Comment: Finlay & Marwick used the LAD of G. index to define the top of the Runangan Stage. One of the dominant planktic species in Middle to Upper Eocene faunas in the South Pacific region. Its LAD is a useful working datum at or slightly below the Eocene-Oligocene boundary.
Cite this publication as: "Strong CP, Raine JI, Terezow M. 2018. Key
species of New Zealand fossil foraminifera: descriptions from "Manual of New
Zealand Permian to Pleistocene Foraminiferal Biostratigraphy" by Hornibrook,
Brazier and Strong, 1989. Lower Hutt (NZ): GNS Science. (GNS Science
miscellaneous series; 123)."
ISSN 1172-2886, ISBN 978-1-98-853088-8,
DOI 10.21420/G2M63W.
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