Volume 12 1969

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Browsing Volume 12 1969 by Author "Davey, Roger J."

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    The evolution of certain upper Cretaceous hystrichospheres from South Africa
    (Bernard Price Institute for Palaeontological Research, 1969) Davey, Roger J.
    This paper traces clearly, for the first time, an evolutionary sequence in dinoflagellate cysts. The sedimentary samples containing the cysts are from nnorthern Natal, South Africa, and are of Upper Cretaceous age. The genera concerned in this study are Exochosphaeridium Davey et al. (1966), Cordosphaeridium Eisenack (1963b) and an intermediary genus Amphorosphaeridium nov. Morphological changes exhibited by the cysts are related to ecological considerations and are shown to be directional; their stratigraphic usefulness is also discussed. In all one genus, three species and two varieties are erected.
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    THE EVOLUTION OF CERTAIN UPPER CRETACEOUS HYSTRICHOSPHERES FROM SOUTH AfRICA
    (BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH, 1969) Davey, Roger J.
    This paper traces clearly, for the first time, an evolutionary sequence in dinoflagellate cysts. The sedimentary samples containing the cysts are from northern Natal, South Africa, and are of Upper Cretaceous age. The genera concerned in this study are Exochosphaeridium Davey et al. (1966), Cordosphaeridium Eisenack (1963b) and an intermediary genus Amphorosphaeridium nov. Morphological changes exhibited by the cysts are related to ecological considerations and are shown to be directional; their stratigraphic usefulness is also discussed. In all one genus, three species and two varieties are erected.
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    SOME DINOFLAGELLATE CYSTS FROM THE UPPER CRETACEOUS OF NORTHERN NATAL, SOUTH AFRICA
    (BERNARD PRICE INSTITUTE FOR PALAEONTOLOGICAL RESEARCH, 1969) Davey, Roger J.
    Fossil dinoflagellate cysts are for the first time described from South Africa and occur in sediments of Campanian, Maastrichtian and possibly Danian age. The sedimentary samples are from a borehole in northern Natal. The systematic section includes the erection of seven new species; these constitute only a few of the many species found in the assemblages.
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    Some dinoflagellate cysts from the upper Cretaceous of northern Natal, South africa
    (Bernard Price Institute for Palaeontological Research, 1969) Davey, Roger J.
    Fossil dinoflagellate cysts are for the first time described from South Africa and occur in sediments of Campanian, Maastrichtian and possibly Danian age. The sedimentary samples are from a borehole in northern Natal. The systematic section includes the erection of seven new species; these constitute only a few of the many species found in the assemblages.