Little has been published about the calcareous nannofossil chronostratigraphy of the niger delta. Since such distributions were constrained by conodont biostratigraphy, they tried to recognize and date the first occurrence of key upper triassic nannofossil taxa such as prinsiosphaera and the first coccolithophores, which became common in. Late oligoceneearly miocene calcareous nannofossil. Journal ol nannopjankton the international nannoplankton. Howard ellis, marathon oil company, littleton, colorado introduction leg 31 of the deep sea drilling project occupied sites and drilled 17 holes in the western pacific region from june to august 1973 figure 1. In chapter 4 results are reported separately for each studied sectionsite. In chapter four, highresolution oligocenemiocene calcareous nannofossil biostratigraphy has revealed thirteen events, five of which are reliable and synchronous due to their similar ages in. A previous study negri and vigliotti, 1997 revealed dif. Highresolution calcareous nannofossil biostratigraphy of. Calcareous nannofossil biostratigraphy and sedimentation rate. The preservation of calcareous nannofossils ap pear to. Thirteen holes were drilled at nine sites in the philippine sea and five.
Calcareous nannofossil biostratigraphy of the marine. Calcareous nannofossil biostratigraphy and the geologic. Calcareous nannofossil biostratigraphy and revised. This study aims to contribute in the understanding of highresolution biostratigraphy and paleoecologic interpretations. Thus far a detailed calcareous nannofossil biostratigraphy is lacking. In our calcareous nannofossil biostratigraphy, we have used three concepts that differ from the absolutely topmost or basalmost stratigraphic presence of taxa. Calcareous nannofossil biostratigraphy, evolution, and taxonomy in two problematic intervals.
Integrated calcareous nannofossil biostratigraphy and. Cenozoic foraminifera and calcareous nannofossil biostratigraphy of the niger delta is available just as exploration and production activities are moving into the little known deep water terrain of the niger delta. Currently, published nannofossil schemes for the coniaciansantonian lack the resolution necessary to define this stage boundary figure 1. The results of this study indicate that the successions comprise the santonianlate maastrichtian sudr formation, the paleocene esna formation and the early eocene thebes formation. T1 highresolution calcareous nannofossil biostratigraphy of the santoniancampanian stage boundary, western interior basin, usa. Quantitative analysis of calcareous nannofossils was performed on quaternary sediments recovered during leg 144 at sites 880 takuyodaisan guyot, 871 limalok guyot, 872 loen guyot, and 873 wodejebato guyot. Pdf calcareous nannofossil biostratigraphy and stage. The calcareous nannofossil biostratigraphy of four deep water wells, a, b, c, d, offshore niger delta has been studied in order to document their biostratigraphic. Fifteen genera and 29 species of calcareous nannofossils were identified in r1 well figs 3, 4. Calcareous nannofossil and foraminifer biostratigraphy of. Site 474 holes 474 and 474a holes 474 and 474a were drilled off the tip of southern baja california in a water depth of 3023 meters. Hauterivianturonian in northern california are summarized using the boreal cosmopolitan boreal nannofossil biostratigraphy bc upper cretaceous nannofossil biostratigraphy uc nannofossil zonal schemes of bown et al. For each sample, at least 500 specimens were counted with the light microscope and the relative abundance of taxa was computed as percentages.
Depth msbf, lithologic subunit, epoch, core, and core recovery shown from left. The only useful event is the fo of the horseshoe shaped genus amaurolithus. Eocene calcareous nannofossil biostratigraphy and community structure from exmouth plateau, eastern indian ocean odpsite 762 jamie l. Calcareous nannofossil assemblages from the smoky hill member of the niobrara formation in the central western interior seaway. Highresolution calcareous nannofossil biostratigraphy for. Comparison of phytoplankton diversity numbers of species and genera, or richness, among the calcareous nannofossils, dinoflagellates, and diatoms and global sea level.
Calcareous nannofossil biostratigraphy in the pearl river mouth basin, south china sea, and neogene reticulofenestrid coccoliths size distribution pattern lusheng huang marine micropaleontology 1997. Calcareous nannofossil biostratigraphic study of forearc. We describe the miocene to pliocene calcareous nannofossil assemblages in southern okinawa. Geologic setting the geology ofthe loh ulo area is very complex, both in structure and sratigraphy. Calcareous nannofossils are widely used for biostratigraphic correlations. Calcareous nannofossil biostratigraphy is a comprehensive practical handbook for palaeontologists and organizations who use calcareous nannofossils in biostratigraphy, and provides a valuable practical reference work for earth scientists engaged in stratigraphic research, and those interested in palaeontology, palaeoceanography, stratigraphy. The stratigraphic log and macrofossil zonation for mesa verde are modified from leckie et al. Kent d,e, domenico rio a a department of geology, paleontology and geophysics, university of padova, via giotto, 1 i357 padova, italy b department of earth sciences, university of milan, via mangiagalli 34, i. The biostratigraphic interpretations are based mainly on the lowest occurrence lo and highest occurrence ho of the marker species. Watkins1 1department of geosciences, university of nebraska, lincoln, nebraska 685880340 email. Nannofossil biostratigraphy in the present study, the zonal schemes of martini 1971 and okada and bukry 1980 have been followed. Calcareous nannofossil biostratigraphy and revised zonation of the pleistocene. The calcareous nannofossil response to climate variability claudia agnini a, giovanni muttoni b,c, dennis v.
Calcareous nannofossil biostratigraphy of late quaternary. Calcareous nannofossil bioevents have been utilized as proxies for stage boundaries when macrofossil resolution is too coarse or macrofossils are poorly preserved. Calcareous nannofossil biostratigraphy, evolution, and. Nannofossil bioevents have been used to interpret cc perchnielsen. Chapters on the mesozoic contain electron microscope illustrations as well as light. Calcareous nannofossils are an exceptionally import. Calcareous nannofossil quantitative biostratigraphy of holes 969e and 963b eastern mediterranean1 enrico di stefano2 abstract the distribution patterns of the selected biostratigraphically useful calcareous nannofossils were analyzed in the pliocene. Late cretaceous calcareous nannofossil biostratigraphy and.
Deep sea drilling project sites 154a, 206, and 289 yielded reasonably complete pleistocene sections of deep sea sediments in which a good to excellent succession of. Eocene biostratigraphy and magnetic stratigraphy from. To analyze the calcareous nannofossil assemblage and establish the calcareous nannofossil biostratigraphy of the section, smear slides were prepared from the samples using standard preparation techniques, and examined under a light microscope using both cross. We recognized 11 calcareous nannofossil zones based on calcareous nannofossil assemblages. Biostratigraphic study allowed the identification of calcareous nannofossil uc3. Calcareous nannofossil assemblages of late quaternary age have been investigated in short sediment cores from the eastern arctic ocean and the norwegian sea. Calcareous nannofossil biostratigraphy and the geologic age of the anno formation, the awa group, in the boso peninsula, central japan. Calcareous nannofossil biostratigraphy, london, chapman and hall. Lithologies ranged from nannofossil ooze to clay in the upper four cores to packstones, grainstones, and wackestones containing only benthic. Other bioevents were used to improve nannofossil biostratigraphy. The upper cretaceous succession of the northwestern desert in egypt comprises two distinctive formations distributed throughout the studied subsurface succession. Calcareous nannofossil biostratigraphy variations in their abundances, and differential degrees of preservation have been considered as evidence of reworking. The ages estimated in these cores are mainly based on calibration with northern north atlantic reference material, where the first appearance of emiliania huxleyi occurs in oxygen isotope stage 8 at 264,000 years b.
Calcareous nannofossils are abundant and moderately preserved in the section. Pdf calcareous nannofossils are considered one of the most powerful biostratigraphical tool in marine carbonate sediments. The calcareous nannofossil assemblages of tenida provides a comprehensive biostratigraphic framework for the paleocene succession, applicable for chronostratigraphic correlation in this region. Eocene biostratigraphy and magnetic stratigraphy from possagno, italy. Evolution of the cretaceous calcareous nannofossil genus.
The oligocene odp leg 199 and turonian odp leg 207. Late miocene calcareous nannofossil genus catinaster. Five biozones reinhardtites levis, arkhangelskiella cymbiformis, lithraphidites quadratus, micula murus, and micula prinsii were. Pdf danian calcareous nannofossil succession at site 738. Pdf calcareous nannofossil biostratigraphy of a, b, c, d wells. Article pdf available december 2014 with 571 reads. Calcareous nannofossil revised biostratigraphy of the. Calcareous nannofossil content of the maastrichtian succession at the western coast of the gulf of suez in egypt has been studied.
Calcareous nannofossil biostratigraphy 85 biostratigraphic interpretations hole 965a only one hole was drilled at site 965. The results of a calcareous nannofossil biostratigraphic investigation of the north fork cottonwood creek section of the budden canyon formation bcf. Upper cretaceous calcareous nannofossil biostratigraphy and paleoceanography of the southern ocean david k. Sixtythree calcareous nannofossil species belonging to 19 genera are identified from the paleocene succession in the study area fig. The examination of the studied samples resulted in the identification of thirtysix calcareous nannoplankton species belonging to twentythree. Cenozoic foraminifera and calcareous nannofossil biostratigraphy of the niger delta 1st edition isbn. Sphenolithus avis is widely distributed and it differs from s. Calcareous nannofossil biostratigraphy and paleoecology of. Cenozoic foraminifera and calcareous nannofossil biostratigraphy of the niger delta fills the gap for earth scientists and those working in the oil and gas industry. Integrated calcareous nannofossil biostratigraphy and magnetostratigraphy from the uppermost marine eocene deposits of the southeastern pyrenean foreland basin. Raw nannofossil abundance data are archived online at the world data center for 3 stratigraphy, vol. A thorough understanding of the cenozoic niger delta will improve understanding and exploration of the evolution of deeper offshore belts, help researchers. Pdf calcareous nannofossils and their applications.
A number of taxa common in middle or low latitudes, such as braarudosphaera, biscutumi romeinii, biscutuml parvulum, cyclagelosphaera, octolithus multiplus, and toweius petalosus are absent at site 738. A detailed calcareous nannofossil biostratigraphy has been. Cenozoic foraminifera and calcareous nannofossil biostratigraphy. Proceedings of the 1st springer conference of the arabian journal of geosc. This article is brought to you for free and open access by the earth and atmospheric sciences, department of at. Chronological and paleoceanographic constraints of miocene. The base of the campanian stage does not have a ratified global stratotype section and point gssp. An apparently complete danian section was recovered at odp site 738 on the southern kerguelen plateau. Four tropical odpiodp sites were quantitatively investigated to enhance the oligocene calcareous nannofossil biostratigraphy between 2430. In chapter 5 i discuss calcareous nannofossil data, testing the reliability of bioevents through different sections.