Issue 1,2007 Table of Contents

1 LATE DEVONIAN BENTHIC OSTRACODES AT THE XIKUANGSHAN SECTION OF HUNAN AND THEIR MASS EXTINCTION

WANG Shang-qi , MA Xue-ping

2007(1):1-32. DOI: 1 CSTR:

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研究的底栖介形类化石采自湖南锡矿山剖面晚泥盆世地层,共30属61种,含1新属,2未定属,13新种和20未定种。在晚泥盆世F/F生物集群灭绝事件之前和以后,根据底栖介形类的演化特征,分为正常期,包括3—5层;灭绝期,即6层;残存期,包括7,8,9a-c,11—13,15层;和复苏期,即20层以上地层。在湖南锡矿山上泥盆统剖面上,底栖介形类动物群遭受到F/F灭绝事件的重创,正常期的37种中仅11种在残存期中幸免于难,24种在本剖面上消失,灭绝种约占65%。对于F/F生物集群灭绝事件的发生机制,虽有多种解释,但造成底栖介形类灭绝的主要原因更可能是缺(贫)氧或含毒环境和气候变化。根据底栖介形类生态组合特征,正常期的介形类动物群代表近岸浅水开阔海台地环境;复苏期的介形类动物群可能代表半局限海台地环境。根据正常期、残存期和复苏期介形类动物群的组成特征,它们所生存的海底为正常的含氧环境。

2 SILURIAN TRILOBITES FROM SANTANGHU, BARKOL, NE XINJIANG

ZHANG Wen-tang , SUN Xiao-wen

2007(1):33-44. DOI: 1 CSTR:

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Trilobites described from the lower part of the Asushan Formation (Pridolian or late Ludlovian to Pridolian) of Santanghu, Barkol, NE Xinjiang, comprise Ananaspis fecunda Barrande, Pacificurus sp. and Cheirurus barkolensis sp. nov. The Silurian fauna from Barkol (northeast Junggar) and Utubulak(northwest Junggar) are intimately ralated to the late Silurian trilobites and graptolites of Kazakhstan and central Europe, especially the Bohemian area. A review on the Pridolian, or late Ludlovian to Pridolian trilobites from five areas in China is given. Ananaspis and Pacificurus is recorded from China for the first time.

3 VEGETATION HISTORY OF THE WESTERN LOESS PLATEAU OF CHINA DURING THE LAST 40ka BASED ON POLLEN RECORD

TANG Ling-yu , LI Chun-hai , AN Cheng-bang , WANG Wei-guo

2007(1):45-61. DOI: 1 CSTR:

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采集甘肃静宁、定西、秦安等地晚更新世晚期以来几个黄土剖面的孢粉样品,分别以晚更新世每个样品分辨率200—300年,全新世20—200年,揭示了黄土高原西部4万多年以来古植被曾经历过草原、森林草原(或疏林草原)、针叶林以及荒漠草原或荒漠几种植被的多次快速变化。在44.2—11kaBP期间,静宁地区植被主要表现为森林和草原成分的相互消长,其中44—29kaBP期间(MIS3)气候以湿润为主,发育针叶林,温度低于现在;23kaBP之后,气候冷干,以稀疏草原为主,在末次盛冰期植被甚至演化为荒漠草原。全新世大部分时间内是以草原或森林草原(或疏林草原)植被为主。在全新世中期,约7.6—5.8kaBP有近1700年时间发育有森林植被,在这个时期当地自然植被覆盖度较高,而草原或疏林草原发育时期植被往往较稀疏,反映气候相对干冷。根据出现的不同类型植物的孢粉浓度及其生态环境特性,研究区早、中全新世,约8.8—5.8kaBP沉积环境较湿润;自3.8kaBP以后气候环境总的变化趋势是逐渐变干,植被开始向草原荒漠化演变。然而,研究区整个全新世气候环境存在多次干湿交替现象,据孢粉记录,其中可能存在11次气候干寒事件。

4 MIDDLE PERMIAN FUSULINIDS FROM THE XAINZA AREA OF THE LHASA BLOCK, TIBET

HUANG Hao , JIN Xiao-chi , SHI Yu-kun , YANG Xiang-ning

2007(1):62-74. DOI: 1 CSTR:

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Over the past two decades, the interpretation regarding the paleogeographic evolution of the Lhasa Block has been rather controversial. Some believed that the Lhasa Block was located in the northern margin of Gondwanaland until Late Triassic (Norian) and then rifted from Gondwana (Metcalfe, 2002); while others argued that the rift took place in later Early Permian (Ueno, 2003). Fusulinids have been proved to be a useful fossil tool in Permian paleogeographic reconstruction (Sheng et al., 1981; Ozawa, 1987; Belasky et al., 2002; Ueno, 2003), thus a detailed study of the Permian fusulinids in the Lhasa Block could provide pivotal paleontological evidence for solving the aforementioned dispute.

5 QUANTITATIVE COMPARISON OF THE FOSSIL ASSEMBLAGES BETWEEN THE EVENT AND BACKGROUND MUDSTONES FROM THE EARLY CAMBRIAN CHENGJIANG LAGERST(A)TTE, YUNNAN

ZHAO Fang-chen , ZHU Mao-yan

2007(1):75-86. DOI: 1 CSTR:

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Qualitative and quantitative variations in preservation (completeness, degree of decay) and fossil composition between event and background layers demonstrate that: (1) for event deposits, fossils are unevenly distributed in different layers, and the number of fossils shows no relation to the thickness of each layer, and the fossil compositions suggest conspecific and polytaxic concentration in some layers. But for background layers, the number of fossils related to the thickness of the layer. Usually the thicker background layer is the more fossil individuals it contains. (2) Comparison of fossil compositions between event layers and background layers indicate dramatic differences. Event layers show more complexity than background layers in composition of fossils and the structure of paleocommunity. Fossil assemblages of event layers may reflect variation of palaeocommunity from different horizons. (3) Decay processes of most organisms in event layers took place after they were buried, or the organisms were buried when even they were still alive. But the organisms of background layers had suffered long decay processes before they were finally buried. As well the fossil assemblages were significantly affected by time-averaging. (4) The fossil assemblages of event layers were autochthonous or parautochthonous, and show no bioturbation after the burial. The presence of abundant articulated shells and sponge fossils in the background layer indicates that they deposited in a stagnant and anoxic bottom water environment with rare scavengers and limited bioturbation.

6 The 7th International Congress on the Jurassic System was held in Krakow of Poland

WANG Yong-dong , DENG Sheng-hui

2007(1):86-86. DOI: 1 CSTR:

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2006年9月10—14日,“第七届国际侏罗纪大会”在波兰克拉科夫市成功举办。来自英国、法国、德国、美国、加拿大、意大利、西班牙、瑞士、捷克、波兰、匈牙利、葡萄牙、俄罗斯、印度、日本、中国、卡塔尔、伊朗、突尼斯、斯洛文尼亚、沙特阿拉伯等近35个国家的200余位代表参加了这次盛会,其中包括国际地层委员会和侏罗系分会主席、副主席、秘书长、选举委员、通讯委员,国际地球科学计划(IGCP)项目负责人和有关国际工作组负责人等。本次国际会议由国际地层委员会侏罗系分会和波兰环境科学部共同发起主办,波兰华沙大学、波兰地质研究院、克拉…

7 DOUBLURE OF PLAGIOLARIA NANDANENSIS CHANG (DEVONIAN TRILOBITA) IN GUANGXI

HAN Nai-ren

2007(1):87-97. DOI: 1 CSTR:

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Many calcareous phacopid specimens have been reported from the U.S and Europe. In China phacopid specimens representing the genera Phacops and Plagiolaria have been reported from Lower and Middle Devonian Mudstones in the Nandan district, Guangxi.The name Plagiolaria was introduced by Kegel (1952) as a new name for Plagiops Kegel, 1932, based on Phacops plagiophthalmus Reinh. Richter 1865. Species of the genus have been reported from Germany, Viet-Nam, Thailand and China. The species studied here is Plagiolaria nandanensis from the lower Middle Devonian Tangding Formation in the Luofu district, Nandan County, Guangxi Province. Specimens are usually preserved in mudstone; some specimens are silicified. The trilobite species is associated with tentaculites and brachiopods. Previous descriptions largely based on internal moulds are therefore inexact as far as the exterior morphology is concerned. In 1987, Han Nairen, Zhou Youmin and Wang Jialing collected many specimens of P. nandanensis in order to study the moulting. Among the specimens were two silicified thoracopygidia. In 1989, Professor Li Youxing provided the authors with a perfect silicified ventral specimen of P. nandanensis Chang in which the doublure of the thorax is well exposed (Pl.1, fig.3). In this specimen, the doublure of the first nine pleural ends is preserved. In 1987, Han and others collected several specimens exposing thoracic doublure.

8 NEW INFORMATION ON SILURIAN RUGOSAN GENUS PILOPHYLLIA GE ET Y(U), 1974 IN NORTHEASTERN GUIZHOU

TANG Lan , HE Xin-yi , CHEN Jian-qiang

2007(1):98-112. DOI: 1 CSTR:

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Pilophyllia Ge et Yü, 1974具有典型的包珊瑚型隔壁,是包珊瑚科的主要分子.该属广泛分布于上扬子区志留纪兰多维列世地层.首次对采自贵州石阡中兰多维列世(Llandovery)爱隆期(Aeronian)香树园组和雷家屯组的大量Pilophyllia Ge et Yü, 1974标本进行详细研究,经鉴定,共计有9种,其中包括6新种,1未定种,它们是: Pilophyllia simplex Chen, 1986, P.fenggangensis Ge et Yü, 1974, P.vesiculosa Tang sp.nov., P.conica Tang sp.nov., P.ultimuma Tang sp.nov., P.stylaris Tang sp.nov., P.raritabulata Tang sp.nov., P.leijiatunensis Tang sp.nov., Pilophyllia sp..此外,根据新的研究材料补充和修订Pilophyllia部分属征,并将石阡地区香树园组和雷家屯组的Pilophyllia种群特征与川北、陕南宁强组(Telychian阶)的进行比较.

9 A STUDY OF DISPERSED CUTICLES IN THE MANGBANG FOMATION (PLIOCENE) OF TENGCHONG,WESTERN YUNNAN

YAN De-fei , SUN Bai-nian , XIE San-ping , Xiao Liang , WEI Li-jie

2007(1):113-121. DOI: 1 CSTR:

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Seven species were recognized from the well preserved dispersed cuticles in the Pliocene of Tengchong, including Reticutis solida, Reticutis tylotis, Fundicutis verriculis, Lusaticutis arizelis, Piliparicutis anfracta, Discrepoparicutis elongate, Enormicutis torquata. They are referable to 6 genera, 4 Subturma, 4 Turma, 1 Anteturma. The species with stoma are more than those without stoma. In the assemblage of dispersed cuticles, L. arizelis,P. anfracta and D. elongata belong to the lower-leaf cuticle type, while R. solida, R. stylotis, F. verriculis and E. torquata belong to the upper-leaf cuticle type. Value of the upper leaf cuticle to lower leaf cuticle is higher than 100%, which indicates that the assemblage has undergone degradation and selective preservation of upper-leaf cuticle type.

10 TRACE FOSSILS OF THE UPPER TRIASSIC BAYANHARSHAN GROUP IN THE QUMARLEB-ZHIDOI AREA, SOUTHERN QINGHAI

ZHAO Xiao-ming , NIU Zhi-jun , DUAN Qi-fa , TANG Chao-yang , YAO Hua-zhou , ZENG Bo-fu , TU Bing

2007(1):122-134. DOI: 1 CSTR:

[Abstract](307) [HTML](0) [PDF 0.00 Byte](5)

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Trace fossils from the upper pant of the Bayanharshan Group (Upper Triassic) in Qumarleb-Zhidoi area, Southern Qinghai Province, have been systematically gathered for the first time, they comprise 54 ichnospecies in 33 ichnogenera. The main ichnogenera include Arthrophycus,Asterichnus,Chondrites,Circulichnis,Cosmorhaphe, Didymaulichnus, Helminthoida,Helminthopsis,Megagrapton,Neonereites,Nereites,Palaeophycus,Palaeodictyon,Pelecypodichnus,Phycodes,Phycosiphon,Planolites,Xiangquanheichnus,Zoophycos and so on. According to the morphology, ethnology and water depth, the studied trace fossils include two ichno-assemblages: one formed before turbidity flows, such as Cosmorhaphe,Helminthopsis,Helminthoida,Megagrapton,Palaeodictyon etc., and the other emplaced after the turbidity event, such as Chondrites,Neonereites,Palaeophycus,Phycosiphon,Planolites,Zoophycos, etc. Both of these assemblages are typical representatives of the bathyal-abyssal Nereites ichnofacies, which therefore would indicate that the Late Triassic pant of the Bayanharshan Group of the studied area was formed in a flysch facies with abundant turbidity currents.

11 PRELIMINARY HISTOLOGICAL STUDY ON THE LONG BONES OF MIDDLE JURASSIC SHUNOSAURUS AND OMEISAURUS FROM DASHANPU,ZIGONG,SICHUAN

YE Yong , PENG Guang-zhao , JIANG Shan

2007(1):135-144. DOI: 1 CSTR:

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The present paper describes the histological features of the long bones of Shunosaurus lii and Omeisaurus tianfuensis from the Dashanpu Dinosaur Fauna in Zigong. There are some similar features in these two dinosaurs as follows: The long bones of the two dinosaurs are composed of the compact bone and cancellous bone. The cortex of the compact bone of the two dinosaurs are fibrolamellar tissues which are composed of primary woven-fibroid and lamellar bone tissues. The cancellous trabeculae are composed of the lamellar bone and with secondary Haversian bones in the lamellar bones. There is an obviously broken cancellous area in the center of the cancellous bone in humerus of the two dinosaurs. The restlines are not found in the long bones of the two dinosaurs. On the other hand, there are some differences in these two dinosaurs as follows: There are no laminar structures in the fibrolamellar bones of the humerus of Shunosaurus lii, but the laminar structures are present in those of Omeisaurus tianfuensis. There is no obvious Haversian bone in the adult humerus of Shunosaurus lii, but it is very obvious in Omeisaurus tianfuensis and its thickness is about the ninety percent of the compact bone. The broken cancellous area in the center of the cancellous bone in humerus of Omeisaurus tianfuensis is much smaller than that of Shunosaurus lii. Through the comparative histological study on the long bones of these two sauropods and other several dinosaurs from the Upper Cretaceous in China, the following results are obtained: The fibrolamellar tissues typical in the compact bones indicate that its long bones had a rapid postnatal growth rate. The growth styles of the dinosaurs belong to the indeterminate growth, it means that the growth is not ceased after they reached adult stage. The rates of deposition are obviouly different in adult dinosaurs. The resorption in the inner part of the bone has more differences in the growth process of the long bones in different dinosaurs. The growth lines have some obvious differences between the different bones or in the growth process of the bones. All the features as mentioned above reveal that the histological features of dinosaurs are very complicated, in which there are some obvious differences between the different dinosaurs or in the adult and juvenile materials of the same dinosaur or the different bones of one individual or the different parts of one bone.

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