980 resultados para also published as VM28-122


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Planktonic foraminiferal diversity, equitability and biostratigraphic analysis of samples from Ocean Drilling Program (ODP) Leg 122, Hole 762C show that in general, cool water conditions prevailed during the latest Campanian-Maastrichtian in the eastern Indian Ocean. This is indicated by planktonic foraminiferal assemblages characterized by low species diversity and equitability with abundant rugoglobigerinids and heterohelicids. Archaeoglobigerinids, globigerinelloids, hedbergellids, and long-ranging double-keeled globotruncanids are also present in varying abundance but single-keeled forms occur rarely and sporadically. Identification of the stage and zonal boundaries for the studied geologic interval have been achieved through biostratigraphic analyses of closely spaced samples. Three planktonic foraminiferal biozones were identified, namely; in stratigraphic order, the Heterohelix rajagopalani, Contusotruncana contusa and Abathomphalus mayaroensis Zones. In Hole 762C, a Transitional Realm with Austral influences is defined for the latest Campanian to Maastrichtian, as shown by the high relative abundance of fauna characteristic of Transitional and Austral Realms. Austral endemic species such as Archaeoglobigerina australis Huber and Hedbergella sliteri Huber were found in the samples studied but Globigerinelloides impensus Sliter andA rchaeoglobigerina mateola Huber are conspicuously absent. From the latest Campanian to middle Maastrichtian, cooler parts of the Transitional Realm prevailed. A slight warming trend is assumed towards the end of the middle Maastrichtian because the faunas contain more species indicative of warm water conditions. The late Maastrichtian also appears to have been warmer than the latest Campanian-middle Maastrichtian. This conclusion is based on the high diversity and equitability values and recognition of some thermophilic taxa. A Tethyan influence is inferred for the latest Maastrichtian on the basis of an increase of planktonic foraminiferal species diversity and occurrences of several keeled taxa.

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Description based on: 2nd session (1817).

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Latest issue consulted: Vols. 66-70 (Oct. 1, 1986 to Sept. 30, 1991).

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Edited by Edward H. Knight. cf. Appleton, Dict. of Amer. biog., under Knight.

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"A second editon of Vols. 1 to 6, by the reporter, was published in 1848-49; and a second edition of Vols. 7 to 21 inclusive, with notes by Thomas M. Day, appeared in 1853-56. The notes to this second edition are numerous, and contain references, not only to the Connecticut series, but also to the Mass. and New York reports." -- Soule, the Lawyer's reference manual.

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Published by O. T. Corson, state commissioner of common schools.

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Vols. 2-4 published as Appendices in Iowa state agricultural society. Report, 1868-1870.