Cretaceous and Tertiary foraminifera of New Zealand : with an appendix on the Ostracoda

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    Chapman, F. 1926 Cretaceous and Tertiary foraminifera of New Zealand : with an appendix on the Ostracoda. Wellington: New Zealand Geological Survey. New Zealand Geological Survey paleontological bulletin 11 119 p.

    Abstract: Since the year 1913, when Dr J. Allan Thomson sent me a consignment of foraminifera from Amuri Bluff, Weka Pass, and Mount Grey, I have been steadily working upon the material with a view to the publication of a memoir upon the New Zealand foraminifera. Until lately, my investigations were confined solely to the foraminifera, but, seeing that occasional valves of ostracods were found in the washings, it was decided to incorporate these also in the present work, and the results have more than justified the extra trouble. Amongst other things, the present monograph shows the clear distinction between the microzoa of the Cretaceous and the Tertiary, and proves beyond question the Older Tertiary aspect of the Weka Pass stone and the grey marls that succeed the Amuri limestone in the North Canterbury region. The Weka Pass stone may represent the lower stage of the Mawheranuian series, but this can be determined conclusively only by collecting more microzoa from that horizon. The Cretaceous microzoa as here described comprise the usual Globigerina and Guembelina facies of Europe and North America, but also include some forms which seem to foreshadow an Eocene fauna; otherwise the facies is fairly distinct. The ostracod from Oxford, North Canterbury, is a typical variety of Upper Cretaceous aspect. The Eocene and Oligocene foraminifera of New Zealand comprise a fauna which resembles that of the Nummulitic and the Septarienthon facies of Germany, but without the nummulites of the former group. The ostracods of the same formations in New Zealand give distinct evidence of the early development of species (as also in Victoria and other parts of the Southern Hemisphere) characteristic of the subtropical Miocene microzoa, many of which still find their habitat in the deeper waters of the ocean. (auth/EB)

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