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presence of well-rounded, coarse-sand gradequartz grains, were derived from a contemporarycarbonate platform. Individual beds in the JebelTisdafine Formation are essentially tabular andcan be followed for long distances. Channellingis very rare. The turbidites, which are quartz-rich,were transported from west to east across a basinfloor with low slopes. Jebel Azguine, northwestof Tinejdad, is separated from Jebel Tisdafine bya major shear zone. It is made up of quartz sandstonesthat differ from those of both the JebelAsdaf and Jebel Tisdafine formations in not containingany carbonate or body fossils, in its tracefossil assemblage dominated by vertical burrows,and in the presence of very thick beds. It is tentativelysuggested that the Jebel Azguine sandstonesare older than Carboniferous, to whichthey are assigned on some geological maps. Theconclusions of this research are markedly differentfrom accounts of the geology of the areapublished previously.2008040528俄 罗 斯 乌 拉 尔 南 部 Usolka 剖 面 卡 西 莫 夫 阶 -格 舍 尔 阶 过 渡 期 的 动 物 群 组 合 及 对 比 ( 确 定格 舍 尔 阶 底 部 金 钉 子 的 一 个 有 潜 力 的 候 选 剖面 ) = Faunal assemblage and correlation ofKasimovian-Gzhelian Transition at Usolka Section,Southern Urals, Russia (a potential candidatefor GSSP to define base of Gzhelian Stage).( 英 文 ). Davydov V I; Chernykh V V; SchmitzM; Snyder W S; Chuvashov B I. Stratigraphy,2008, 5(2): 113 - 136The conodont species Streptognathodus simulatorEllison 1941 has been proposed to definethe Kasimovian-Gzhelian boundary of the globalchronostratigraphic scale based in part on itsglobal distribution (Heckel et al. 2005). TraditionallySt. simulator has been used as a markerof the base of the Gzhelian Stage in the type sectionsin Moscow Basin and Urals, but the proposeddefinition places the FAD of St. simulatorabove its traditional lithostratigraphic boundary.This allows the stage boundary to be movedfrom a position where it is corresponds to a sequenceboundary to where it is at or close to amaximum flooding surface. This new boundaryappears within the range of Rauserites rossicus(sensu lato) and therefore affects regional andinterregional fusulinid biostratigraphy and correlation.Also, the proposed boundary appearsabove the FAD of fusulinid genus Rugosofusulina.Fusulinid and conodont biostratigraphywithin the Kasimovian-Gzhelian transition inMoscow, S. Urals and Donets Basin is reviewedand new fusulinid species that allow recognizingnewly defined boundary are described.2008040529伊 朗 西 北 部 上 二 叠 统 及 三 叠 纪 最 下 部 地 层 、相 和 介 形 类 化 石 — 对 P/T 绝 灭 事 件 的 意 义 =Upper Permian and lowermost Triassic stratigraphy,faciesand ostracods in NW Iran -implications for the P/T extinction event. ( 英 文 ).Mette W. Stratigraphy, 2008, 5(2): 205-219,Ostracod faunas from Upper Permian toLower Triassic shelf deposits of NorthwesternIran were investigated with respect to theirstratigraphical range, palaeoecology and extinctionpatterns. Faunal changes caused by sea levelrise are recorded in the lower Dzhulfian, lowerand upper Dorashamian. The global End-Permian mass extinction event is recorded inNW Iran by a complete ostracod faunal turnoverin the uppermost Dorashamian (C. meishanensis– H. praeparvus Zone) and disappearance of thedeep neritic communities. The lithofacies andmicropalaeontological data show that there wasno shelf anoxia in Northwest and Central Iranduring the P/T Boundary (PTB) interval and earliestTriassic. Ostracod extinction patterns inIran indicate that the Late Permian mass extinctionwasnot directly effected by the onset ofshelf anoxia. According to quantitative palaeobiogeographicalresults faunal exchange ofneritic ostracods in the Palaeo- and Neotethyswas very limited during the Late Permian.Occurrencesof closely related species atthe PTB and in the lowermost Triassic of Iran(Sandandaj-Sirjan region), Taurus and SouthChina however, suggest that these regions wereconnectedby shelf migration routes during thistime interval.2008040530美 国 得 克 萨 斯 Wise 县 Canyon 群 下 部 ( 上 宾夕 法 尼 亚 亚 系 密 苏 里 阶 ) 的 历 史 分 析 和 重 新解 释 = Historical analysis and reinterpretation ofthe lower part of the Canyon Group (Missourian,Upper Pennsylvanian), Wise County,Texas: Afine can of worms. ( 英 文 ). Nestell M K; KimballR A. Stratigraphy, 2007, 4(4): 313-328Late Pennsylvanian (Early Missourian) agelimestone strata exposed in several isolated outcropsin the Trinity River Valley in southwestWise County, Texas were last described by Böse(1917), and Scott and Armstrong (1932).Thesestrata can be correlated with the Upper PennsylvanianPalo Pinto and Posideon formations ofLaury (1962) in the lower part of the CanyonGroup in the Brazos River Valley. The two reportswere stratigraphically inconsistent concerningthe seven limestone units of the PaloPinto Formation as named by Scott and Armstrong(1932), and both included many poorlylocated type sections. The Böse (1917) reportincluded no map and many key geographic referenceswere to 1914 ranch names. Wise County160