Guide to some Neogene Globorotalids (Foraminiferida) from New Zealand (print copy)

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Scott, G.H.; Bishop, S.; Burt, B.J. 1990 Guide to some Neogene Globorotalids (Foraminiferida) from New Zealand. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey paleontological bulletin 61 1 v.

Abstract: Globorotalid taxa (planktonic foraminiferal) are of major importance in New Zealand Neogene biostratigraphy. A detailed account is given of the morphology of 36 taxa belonging to Fohsella, Globorotalia and Paragloborotalia. Most of the taxa currently useful in biostratigraphy are included. New taxa proposed are Globorotalia amuria, Globorotalia crassacarina, G. kingmai and G. paniae. Shells are described and illustrated in 3 standard orientations (spiral, axial, umbilical). Terminology is introduced for detailed descriptions of the outlines of shells and chambers. Important features are identified in summary diagrams. For each taxon, variation within a representative sample is described and some aspects of interpopulation variation are discussed. Stratigraphic distributions are reviewed, using onshore data for most of the Miocene and some offshore data for the post- Miocene. One major endemic plexus developed from Globorotalia praescitula in the Altonian Stage (lower Miocene) and dominated assemblages for the remainder of the Miocene. Diversity expanded from Clifdenian to lower Waiauan (middle Miocene), in part due to the arrival of northern taxa, but declined relatively rapidly in the latter part of the Waiauan Stage. Upper Miocene Tongaporutuan and lower Kapitean assemblages are species poor, with the endemic plexus strongly dominant. An architectural renaissance commenced in the upper zone of the Kapitean Stage (close to the Miocene - Pliocene boundary) with the evolution of an endemic lineage leading to the globose Globorotalia inflata inflata. Ventroconical taxa feature prominently in the expansion of globorotalid diversity in the Pliocene while compressed biconvex taxa from lower latitudes are conspicuously absent.

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