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北 海 古 近 纪 一 种 新 型 孢 型 : 有 机 微 化 石 ='Organic nannofossils': a new type of palynomorphfrom the Palaeogene of the North Sea.( 英 文 ). Hochuli P A. Journal of Micropalaeontology,2000, 19(part 2): 153-158Organic microfossils of regular dodecahedralshape are found in the Palaeogene (Lower Oligocene)of the central and northern parts of theNorwegian North Sea. The shape and structureof these fossils are very similar to coccospheresof the calcareous nannoplankton genus Braarudosphaera.The individual pentagonal platesshow the same morphological features as replicasof the inner surface of pentaliths formingcalcareous coccospheres. It is the first evidencethat a representative of calcareous nannoplankton(Haptophyta, Coccolithophorales) is found toproduce acid-resistant organic microfossils. Theorganic remains might have been produced by anundescribed species of the genus Braarudosphaeraor represent an unknown stage in the lifecycle of species which normally produce calcareousplates.2008040047一 个 北 海 盆 地 下 白 垩 统 微 化 石 带 = A LowerCretaceous nannofossil zonation for the NorthSea Basin. ( 英 文 ). Jeremiah J. Journal of Micropalaeontology,2001, 20(part 1): 45-80Analysis of cored sections from the CentralNorth Sea Basin, boreholes from the onshoreNetherlands and onshore sections from the UKand Germany has enabled a major reappraisal ofLower Cretaceous nannofossil datums. TheLower Albian to Upper Barremian interval hits,in particular. been comprehensively amended.Five new species, Crucibiscutum bosumensis sp.nov., Crucibiscutum ryazanicum sp. nov.,Lithraphidites houghtonii sp. nov., Seribiscutumdentatum sp. nov.. Staurolithites palmula sp. nov.and one new sub-species, Biscutum constanscavum ssp. nov. are described.孢 粉2008040048对 孢 粉 分 析 标 准 处 理 方 法 的 评 估 = A criticalassessment of standard processing methods forthe preparation of palynological samples. ( 英 文 ).Lignum J; Jarvis I; Pearce M A. Review of Palaeobotanyand Palynology, 2008, 149(3-4):133-149Standard processing techniques for the isolationof organic walled dinoflagellate cysts fromgeological samples are examined, with particularattention to the size and type of sieve mesh used.Variations within the ‘standard’ processing techniquesused by different laboratories are identified,and an assessment of the retention capacitiesof meshes of different sizes and differentmaterials is carried out. Some dinoflagellatecysts and large numbers of Lycopodium spores,used for the calculations of absolute abundancedata, were found to pass through 20 μm meshes.This is due to a combination of factors including:the diagonal aperture diameter of a 20 μm meshmeasuring over 28 μm; the three-dimensionalproperties of different mesh weaves (nylon andpolyester); and the non-spherical shape of theparticles. Experiments demonstrate that themaximum mesh size that should be used in palynologicalprocessing is 15 μm. Nylon mesh ismore practical to use than polyester as processingtime is reduced, but nylon is degraded bycontact with acid solutions. Meshes with apertures< 15 μm may be used, though this may beimpractical for large samples containing significantquantities of fine siliciclastic or organicmaterial.2008040049桑 科 各 属 之 间 的 花 粉 差 异 及 其 所 指 示 的 亚 马逊 地 区 古 生 态 意 义 = Palynological differentiationbetween genera of the Moraceae family andimplications for Amazonian palaeoecology. ( 英文 ). Burn M J; Mayle F E. Review of Palaeobotanyand Palynology, 2008, 149(3-4):187-201The Moraceae family is one of the most abundantand ecologically important families inNeotropical rainforests and is very wellrepresentedin Amazonian fossil pollen records.However, difficulty in differentiating palynologicallybetween the genera within this family,or between the Moraceae and Urticaceaefamilies, has limited the amount of palaeoecologicalinformation that can be extractedfrom these records. The aim of this paper is toanalyse the morphological properties of pollenfrom Amazonian species of Moraceae in order todetermine whether the pollen taxonomy of thisfamily can be improved. Descriptive and morphometricmethods are used to identify and differentiatekey pollen types of the Moraceae(mulberry) and Urticaceae (nettle) familieswhich are represented in Amazonian rainforestcommunities of Noel Kempff Mercado NationalPark (NKMNP), Northeast Bolivia. We demonstratethat Helicostylis, Brosimum, Pseudolmedia,Sorocea and Pourouma pollen can be identifiedin tropical pollen assemblages and present digitalimages of, and a taxonomic key to, theMoraceae pollen types of NKMNP. Indicatorspecies, Maquira coriacea (riparian evergreenforest) and Brosimum gaudichaudii (open woodlandand upland savanna communities), also exhibitunique pollen morphologies. The ability torecognise these ecologically important taxa inpollen records provides the potential for muchmore detailed and reliable Neotropical palae-16