graphy and Geological Correlation, 2007, 15(3):267-276The work is aimed at litho-, bio- and magnetostratigraphicsubdivision of the Middle-UpperJurassic sedimentary succession in the northeastof the Ul’yanovsk-Saratov depression (the EastRussian plate). Problems of regional and interregionalcorrelation of distinguished subdivisionsare considered. As is shown, the ammonite biostratigraphyis most effective method for solvingproblems of chronostratigraphy.2008040540根 据 磁 性 地 层 学 和 生 物 地 层 学 对 北 方 区 - 特 提斯 区 侏 罗 纪 - 白 垩 纪 界 线 之 间 对 比 = Borealtethyancorrelation of the Jurassic-Cretaceousboundary interval by magneto- and biostratigraphy.( 英 文 ). Houša V; Pruner P; Zakharov V A.Stratigraphy and Geological Correlation, 2007,15(3): 297-309As a result of detail sampling and paleomagneticstudy of the 27-m-thick section of Jurassic-Cretaceous boundary beds in the Nordvik Peninsula(Anabar Bay, Laptev Sea), a succession ofM-zones correlative with chrons M20n-M17r isestablished for the first time in the Boreal deposits.Inside the normal polarity zone correspondingto Chron M20n, a thin interval of reversedpolarity, presumably an equivalent of the KysucaSubzone (M20n.1r), is discovered. The otherthin interval of reversed polarity establishedwithin the next normal polarity zone (M19n) iscorrelated with the Brodno Subzone (M19n.1r).The same succession of normal and reversedpolarity zones has been discovered recently inthe Jurassic-Cretaceous boundary beds of theTethyan sections: in the Bosso Valley (Italy), atthe Brodno (Slovak Republic) and Puerto Escaño(Spain) sites. Correlation of successionsestablished lead us to conclusion, that the Jurassic-Cretaceousboundary corresponds in thePanboreal Superrealm to a level within theCraspedites taimyrensis Zone of the upper VolgianSubstage. Hence, the greatest part of VolgianStage should be included into the JurassicSystem. Biostratigraphic data do not contradictthis conclusion.2008040541俄 罗 斯 伏 尔 加 中 部 地 区 古 新 世 末 期 的 生 物 地层 和 古 环 境 = Terminal paleocene of the Volgamiddle reaches: Biostratigraphy and paleosettings.( 英 文 ). Oreshkina T V; Aleksandrova G N.Stratigraphy and Geological Correlation, 2007,15(2): 206-230Diatoms and marine palynomorphs from severalsections of the Kamyshin Formation (Sengilei-1,Sengilei-2, Balasheika, Kuz’kino, boreholes38 and 50) are jointly studied for the firsttime in the Volga middle reaches. According toresults, the formation lower part correspondshere to Viborg Zone 4-Viborg Zone 5 (Heilmann-Clausen,1985)/Alisocysta margarita(part)-Apectodinium hyperacanthum (Powell,1992) diatom zones of Northern Europe. Higherlevels of the formation are correlative with Trinacriaventriculosa and Hemiaulus proteus dinocystzones (Strelnikova, 1992). Thus, the Kamyshinsedimentary cycle in the Volga middlereaches corresponds to the interval of NP8 (part)and NP9 zones of the general scale. As is established,different terrigenous to siliceous facies ofthat cycle (sands, diatomites, opokas and clay)are mostly confined to eastern and southeasternareas of the study region. Judging from taxonomiccomposition, assemblages of diatoms andmarine palynomorphs originated in coastal paleosettingswith active hydrodynamics and highproductivity of water mass. Diatom assemblagesfrom different facies are dissimilar. Three phasesof Thanetian transgression are distinguishedbased on quantitative proportions of differentecologic groups (Paralia/Pyxidicula ratio variations).Within transition from the Trinacria ventriculosato Hemiaulus proteus Zone, there arerecorded considerable changes in composition ofdiatom assemblages: the appearance of new generawith considerable morphologic innovations(Podosira, Craspedodiscus, Fenestrella, Moisseevia,Solium, Gyrocylindrus) and compositionalrenewals of genera Pyxidicula, Trinacria,and Hemiaulus. These changes are indicative ofa global biotic crisis in the Paleocene-Eocenetransition related with thermal maximum andnegative C-isotope excursion and extinction ofbenthic fauna groups.2008040542大 型 浅 水 泥 质 缓 坡 的 古 环 境 、 古 地 理 和 自 然地 理 : 西 加 拿 大 陆 前 盆 地 晚 赛 诺 曼 期 - 土 仑 期Kaskapau 组 = Palaeoenvironments, palaeogeography,and physiography of a large, shallow,muddy ramp: Late Cenomanian-TuronianKaskapau Formation, Western Canada forelandbasin. ( 英 文 ). VARBAN B L; PLINT A G.Sedimentology, 2008, 55(1): 201–233The Kaskapau Formation spans Late Cenomanianto Middle Turonian time and was depositedon a low-gradient, shallow, stormdominatedmuddy ramp. Dense well log control,coupled with exposure on both proximal anddistal margins of the basin allows mapping ofsedimentary facies over about 35 000 km 2 . Thestudied portion of the Kaskapau Formation is amudstone-dominated wedge that thins from700 m in the proximal foredeep to 50 m near theforebulge about 300 km distant. Regional floodingsurfaces permit mapping of 28 allomembers,each of which represent an average of ca 125 kyr.164
More than 200 km from shore, calcareous siltyclaystone predominates, whereas 100 to 200 kmoffshore, mudstone and siltstone predominate.From about 30 to 100 km offshore, centimetrebeddedvery fine sandstone and mudstone recordalong-shelf (SSE)-directed storm-generatedgeostrophic flows. Five to thirty kilometres fromshore, decimetre-bedded hummocky crossstratifiedfine sandstone and mudstone recordstrongly oscillatory, wave-dominated flowswhereas some gutter casts indicate shore-oblique,apparently mostly unidirectional geostrophicflows. Nearshore facies are dominated by swaleycross-stratified or intensely bioturbated cleanfine sandstone, interpreted as recording, respectively,areas strongly and weakly affected bydischarge from distributary mouths. Shorefacesandstones grade locally into river-mouth conglomeratesand sandstones, including conglomeratechannel-fills up to 15 m thick. Locally,brackish lagoonal shelly mudstones are presenton the extreme western margin of the basin.There is no evidence for clinoform stratification,which indicates that the Kaskapau sea floorhad extremely low relief, lacked a shelf-slopebreak, and was probably nowhere more than afew tens of metres deep. The absence of clinoformsprobably indicates a long-term balancebetween rates of accommodation and sedimentsupply. Mud is interpreted to have been transported>250 km offshore in a sea-bed nepheloidlayer, repeatedly re-suspended by storms. Finegrainedsediment accumulated up to a ‘mud accommodationenvelope’, perhaps only 20 to40 m deep. Continuous re-working of the seafloor by storms ensured that excess sedimentwas redistributed away from areas that had filledto the ‘accommodation envelope’, being depositedin areas of higher accommodation furtherdown the transport path. The facies distributionsand stratal geometry of the Kaskapau shelfstrongly suggest that sedimentary facies, especiallygrain-size, were related to distance fromshore, not to water depth. As a result, the ‘100 to>300 m’ depth interpreted from calcareous claystonefacies for the more central parts of the InteriorSeaway, might be a significant overestimate.2008040543海 地 富 含 小 球 体 沉 积 的 时 代 、 化 学 地 层 和 生物 地 层 : 多 事 件 K–T 景 象 = Age, chemo- andbiostratigraphy of Haiti spherule-rich deposits: amulti-event K–T scenario. ( 英 文 ). Keller G;Adatte T; Stinnesbeck W; Stüben D; Berner Z.Canadian Journal of Earth Sciences, 2001,38(2): 197-227Examination of two new expanded K–T transitionsand reexamination of road outcrops nearBeloc, Haiti, reveals that deposition of the glassspherule-rich deposit (SRD) occurred within theearly Danian Parvularugoglobigerina eugubina(Pla(1)) Zone, followed by an Ir anomaly, and50 cm above it, a second Pd-dominated platinumgroup element (PGE) anomaly. The K–T boundaryis at an erosional unconformity between thebase of the SRD and underlying Maastrichtianlimestone, where an interval representing about100–250 thousand years appears to be missing(juxtaposition of planktic foraminiferal zones(Pla(1)) and Plummerita hantkeninoides (CF1)).It is possible that the spherule layers are reworkedfrom original deposits at or below theK–T boundary. The Ir anomaly is of roughlychondritic-type and compatible with an impactevent, whereas the Pd-dominated PGE anomalyis a more basalt-type and compatible with amagmatic origin. This suggests a multi-eventscenario consistent with one impact followed bya major volcanic event in the Caribbean or elsewhere2008040544美 国 墨 西 哥 湾 北 部 侏 罗 纪 和 白 垩 纪 海 进 和 海退 旋 回 = Jurassic and Cretaceous Transgressive-Regressive(T-R) Cycles, Northern Gulf ofMexico, USA. ( 英 文 ). Mancini E A; Puckett TM. Stratigraphy, 2005, 2(1): 31-48Establishment of a chronostratigraphicframework is fundamental to the correlation ofstrata and for the interpretation ofthe geohistoryof a basin. For the onshore basins in the northernGulfofMexico, an integrated sequence stratigraphicand biostratigraphicapproach has utilityas amethod for establishing such a framework.Eleven transgressive-regressive (T-R) cycles andnumerous biozones are recognized in Jurassicand Cretaceous non-marine, coastal and marineshelf strata of basins of the northern Gulf of-Mexico. The cyclesconsist of a transgressivephase (aggrading and backstepping intervals)and a regressive phase (infilling interval). Cyclerecognitionis based on stratal geometries, thenature of the cycle boundaries, facies stackingpatterns and large-scale shifts in major faciesbelts. Cycles are primarily controlled by thechange inaccommodation space resulting fromstratigraphic base-level changes (eustatic andtectoniceffects) and sediment supply. Utilizingthis integrated approach, 12 regional unconformitiesand 11 surfaces of maximum transgression(regionalmarine flooding surfaces) wereidentified as major events in theMesozoicgeohistory of the northern Gulf ofMexicoregion.The surfaces of maximum transgression havepotential as events for chronocorrelation.2008040545伊 朗 西 北 部 Khoy 杂 岩 构 造 地 层 学 = Tectonostratigraphyof the Khoy Com-165
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第 4 卷 第 4 期古 生 物 学
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Fossils, i.e. remains of living org
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nus, a new ichnospecies of Fuersich
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以 松 柏 类 和 盾 籽 类 为
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Island, Papua New Guinea. ( 英 文
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A C. Canadian Journal of Earth Scie
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mated depositional interval of 10 t
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北 海 古 近 纪 一 种 新 型
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scabrate-verrucate, and rugulate mi
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the Tetori Group in the Kuzuryu are
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during the Late Pleistocene are rec
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ane have been previously reported f
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Albian-early Paleocene in the Anady
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Poaceae and Plantago lancelata. shr
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the eastern segment of its southern
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member of the La Despedida Formatio
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lembaye (Maastricht region) and fro
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tion the ontogenetic stage of the p
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早 期 种 子 植 物2008040123
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中 国 内 蒙 古 东 北 部 晚
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2008040137辽 西 北 票 中 侏
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综 论2008040144低 PH 值 对 Amm
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ut poorly studied. Dimorphism (or t
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and migration towards the sediment-
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schackoinids, indicating that the e
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( 英 文 ). Nomaki H; Yamaoka A; S
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新 西 兰 Otago 南 海 岸 全
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Scotland. ( 英 文 ). Murray J W.
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A three-year sediment trap experime
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a habitat disturbance and is nearly
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Pitted surfaces associated with wal
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Saanich than exists today sedimento
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was pulsed, with major declines usu
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mycelium, was observed where reticu
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suggest that reticulopodia are self
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to OIS 3, compared to the more stab
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Patterson R T. Journal of Foraminif
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known xenophyophore species grouped
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aminiferal Research, 2001, 31(4): 2
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arctic environment over this critic
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Semeniuk T A. Journal of Foraminife
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sible to make production calculatio
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arcellacean strains from within the
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annual flux rates is calculated and
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corded in the Colli Berici (type lo
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most complete OAE 2 sections. While
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oceanic plate stratigraphy from gra
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A series of layers rich in organic
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lowermost Danian planktonic foramin
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characters shows that only one geno
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able for regional palaco-environmen
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margin of the southwest Caribbean.
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Brachyelasma, Amplexobrachyelasma,
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litic biozones lower than their FAD
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The middle Permian Cryptospirifer f
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