A New Sauropod, Gongxianosaurus, from the Lower Jurassic of Sichuan, China

The paper describes an early and primitive sauropod dinosaur, Gongxianosaurus shibeiensis (gen. et sp. nov.), from the Dongyuemiao Member of the Lower Jurassic Ziliujing Formation in Shibei Township, Gongxian County, Sichuan Province, China, which is one of the 5 dinosaur fossils discovered in Gongxian in 1997. Except the skull which is incomplete, the fossils are well preserved. It has some features of both sauropods and prosauropods. It is an intermediate type in the evolution of dinosaurs from prosauropods to sauropods and provides materials for the study of the origin and evolution of the sauropod dinosaur fauna. The discovery of this new sauropod furnishes a way for the stratigraphic correlation between the Early Jurassic Ziliujing Formation in the Sichuan basin and the Lower Jurassic Lufeng Formation in the Central Yunnan basin.     

泰国半岛侏罗纪叶肢介再研究

产于泰国半岛班关坤村附近的叶肢介化石原鉴定为 Pseudograpta cf.yuzhongensis Chen,P.jialingensisDuan,P.siamensis Duan,P.sp.,Paleoleptestheria chinensis Chen和 Palaeolmnadia?sp.等 5个属种或未定种 ,认为其时代为中侏罗世晚期。现经重新研究 ,发现这些叶肢介化石生长带上的网孔状装饰网壁相对较粗 ,网孔较深 ,孔径比 Euestheria ziliujingensis叶肢介群的分子要稍大一些 ,但远比 Pseudograpta或 N estoria叶肢介群的要小 ,基本上可以归入 Paleoleptestheria?chinensis叶肢介群 ,其生物地理区系属于古地中海水系 ,与中国西南湖群中侏罗世晚期的叶肢介动物群关系最为密切 ,其生存时代与北方地理区系的 Pseudograpta叶肢介动物群大致平行     

赣东北早中侏罗世地层研究新进展

上饶县清水乡林山组、罗坳组剖面出露完好、化石丰富、顶底齐全、地层连续,是赣东北新发现的一条下中侏罗统最佳剖面,有１３个化石层位,划分成７个岩性段。野外进行了接触关系、沉积特征、古气候特征资料搜集,室内进行了植物、双壳与叶肢介化石详细鉴定,确认１—５段含Ｐｔｉｌｏ－ｐｈｙｌｕｍ－Ｃｏｎｉｏｐｔｅｒｉｓ植物组合、Ｐｓｅｕｄｏｃａｒｄｉｎｉａ－Ｔｕｔｕｅｌａ双壳组合的含煤地层为林山组,时代为早侏罗世中晚期,６—７段含自流井真叶肢介动物群的杂色砂页岩为罗坳组,时代为中侏罗世。     

中国西南攀西地区下侏罗统益门组蜥脚类足迹:分类学与潜在的造迹者

恐龙足迹和骨骼的记录往往出现在不同的地区。然而,一些地层显示了关系紧密的骨骼和足迹,它们都指向同一个来源。报道了来自四川省攀西地区会理县通安镇通保村下侏罗统益门组中上部的蜥脚类足迹(雷龙足迹Brontopodus),其地理和地层归属均与真蜥脚类的何氏通安龙极为接近。通保足迹与造迹者的关联是可能的,但目前还需要更多的证据。通保的雷龙足迹是攀西地区首次发现侏罗纪的蜥脚类足迹,这也表明,在早侏罗世,原始蜥脚类和基干蜥脚型类共存于中国西南地区。     

Significance of the Early Jurassic Garamilla formation in the western Nordpatagonian Massif

By means of facial, stratigraphic, petrographic, geochemical and geochronological studies we characterize the Garamilla Formation, cropping out in the western Nordpatagonian Massif.The studies of these volcanic rocks reveal an Early Jurassic volcanic episode formed by three volcanic units that change from normal calc-alkaline to high-K calc-alkaline series. Other geochemical features reveal a progressive change from an initial subduction-related volcanism to one intraplate-related volcanism.This volcanic episode is temporally and geochemically equivalent to those volcanic units located in half-grabens in several areas of the Neuquén Basin.The volcanic units were erupted into different structural designs. A portion of its depocenter was interpreted as a transtensional half-graben, whereas the other exhibits a trapdoor structure. The lineament trends that bound the volcanic system were also recognized in western Nordpatagonian Massif, and were assigned to the Gondwanide Orogeny.     

新疆境内塔拉斯-费尔干纳断裂早侏罗世走滑的古地震证据

在野外考察过程中,于新疆乌恰地区早侏罗世康苏组沼泽相砂岩层中,发现并识别出软沉积物液化变形层,变形包括负载构造,球-枕构造及卷曲变形构造。通过模拟试验的对比研究认为,该软沉积物变形机制与液化作用有关,触发沉积物液化的动力是古地震,并且根据地震震级与液化最大震中距的关系,推测出造成早侏罗世软沉积物变形的里氏地震震级为6相似文献   

Early Jurassic Coleopterans from the Mintaja Insect Locality,Western Australia

<正>Beetles(Coleoptera)are the most common insects recovered from the Lower Jurassic Mintaja insect locality of Western Australia,with over half of the fossils recorded from this site being isolated coleopteran elytra. A range of partial beetle bodies and other isolated beetle sclerites have also been recovered from the locality; much of this material is taxonomically unidenitifiable due to its disarticulation and poor preservation.A number of the Mintaja coleopterans are assigned to the archostematan family Ommatidae,including Zygadenia westraliensis(Riek,1968)comb.nov,previously placed in the morphogenus Mesothoris,and an unnamed species of Tetraphalerus.Also recorded is a new species of elaterid,Lithomerus wunda sp.nov.,along with other fragments likely attributable to the same family.The remaining material is assigned into morphospecies, separated primarily on preserved body parts—specifically,there are three morphospecies based on partially articulated coleopteran bodies,two morphospecies based on isolated head capsules,three morphospecies based on isolated thoracic sclerites,three morphospecies based on isolated abdominal sclerites,and 13 morphospecies based on isolated elytra.Overall,the ecology of these fossils is difficult to interpret due to poor preservation, although some of the beetles were likely aquatic,and the Ommatidae and Elateridae were both likely xylophilous. There is a strong similarity between the Mintaja coleopterans and those from the Late Triassic Denmark Hill locality of Queensland,though many of these similarities are based on morphotaxa and may be superficial in nature.Of the species that have been assigned to named taxa,all are generally typical of the Late Mesozoic worldwide,with Zygadenia,Tetraphalerus and Lithomerus all long-ranging,cosmopolitan genera.     

东喜马拉雅地区晚三叠世—早侏罗世的菊石类

在东喜马拉雅范围以内的西藏康马、洛扎和隆子地区有国内首次发现的晚三叠世诺利期—早侏罗世Glyphidites、Phormedites、Epideroceras、Phricodoceras Uptonia等菊石。晚三叠世诺利期有Tibetites sp.、Anatibetites sp.、Glyphidites sp.、Cyrtopleurites sp.、Parajuvavites sp.、Sagenites sp.和Phormedites sp.。早侏罗世辛涅缪尔期有Arnioceras ceratoides、Angulaticeras sp.、Arnioceras sp.、Juraphyllites sp.、Epideroceras sp.以及普林斯巴赫期Phricodoceras cf.cornutum、Uptonia sp.、Galaticeras sp.、Gleviceras cf.paniceum等。东喜马拉雅地区的菊石动物群在晚三叠世—早侏罗世期间的幕式出现与海侵和沉积环境变深有关,代表受海平面变化控制的晚三叠世的诺利中期(Columbianus带)、早侏罗世的辛涅缪尔期(Semico-statum带)、以及普里斯巴赫早期(Jamestoni带)的全球性菊石动物群扩散和迁移。     

拉萨地体南部早侏罗世岩浆岩的成因和构造意义

本文从拉萨地体南部原来被认为是前寒武纪变质基底的冈底斯岩群中厘定出了一套早侏罗世的岩浆岩.锆石U-Pb年代学研究表明,这些岩浆岩侵位于202～ 180Ma.岩石类型包括辉长闪长岩、二长岩和花岗闪长岩,是一套中酸性、偏铝质钙碱性、Ⅰ型花岗岩类.微量元素表现出消减带富集大离子亲石元素、亏损高场强元素的特征,并具有岛弧花岗岩的亲缘性.锆石Hf同位素研究表明,加查地区中酸性岩石来自新生地壳物质的熔融,偏基性岩石来自于亏损地幔.而桑日地区的酸性岩石来自于古老地壳物质的重熔.本文认为包括研究区在内的南拉萨地体中的晚三叠世-早侏罗世岩浆岩为俯冲到南拉萨地体之下的松多洋壳断离或回卷,软流圈地幔上涌,地幔楔熔融并加热上覆地壳的产物.     

A New Ceratopsian from the Upper Jurassic Houcheng Formation of Hebei, China

A new ceratopsian taxon Xuanhuaceratops niei gen. et sp. nov. is erected based on four fragmentary specimens collected from the Late Jurassic Houcheng Formation, Hebei Province, China. Xuanhuaceratops shares a number of derived features with, and is closely related to, another probable Late Juarassic ceratopsian Chaoyangsaurus youngi, from which it differs in only possessing a single premaxillary tooth as well as in details of quadrate and scapular morphology. We hypothesize that these two taxa represent a primitive lineage of Ceratopsia that is basal to the psittacosaurid-neoceratopsian diversity, and propose the name Chaoyangsauridae for it     

Braincase Anatomy of the Basal Theropod Sinosaurus from the Early Jurassic of China

The neuroanatomy of the mid-sized theropod Sinosaurus triassicus from the Lower Jurassic Lufeng Formation, Lufeng Basin in Yunnan Province, China was studied using X-ray computed tomography. The braincase is characterized by a large supraoccipital knob that is capped by a posterior projection of the parietal and two external foramina for the caudal middle cerebral vein, which is completely enclosed by the supraoccipital. The basicranium has well defined, short basipterygoid processes that project ventral to the basal tubera. The basisphenoid is expanded, projects posteroventrally, and is pierced by four pneumatic recesses. The endocranial morphology resembles that observed in other basal theropods—in particular some allosauroids—and has a strongly marked pontine flexure and a large dorsal expansion. The inner ear morphology is also similar to that observed in other basal theropods, with slender semicircular canals. The anterior semicircular canal is 20% larger than the posterior semicircular canal, and the angle formed between them is less than 90° when seen in dorsal view.     

A New Titanosauriform Sauropod from the Early Late Cretaceous of Dongyang, Zhejiang Province

A new titanosauriform sauropod Dongyangosaurus sinensis gen. et sp. nov. from the early Late Cretaceous of Dongyang County, Zhejiang Province, is erected based on a partial postcranial skeleton. It is characterized by complex laminae on the lateral surface of the neural spines and postzygapophyses of dorsal vertebrae, a distinct fossa on the ventral surfaces of the prezygapophyses of dorsal vertebrae, distinct fossae are also present on the lateral surface of the postzygapophysis of anterior caudal vertebrae; pubis is shorter than ischium, the small obturator foramen of pubis elongated, and nearly closed. The lamina complexity of dorsal vertebrae in Dongyangosaurus indicates that a higher diversity of titanosauriformes occurred during the early Late Cretaceous in China.     

滇西祥云地区早侏罗世地层发现恐龙新墓地

1938年,云南许氏禄丰龙的发现拉开了云南侏罗纪恐龙研究、发掘的序幕,恐龙化石的发现地从云南禄丰一带向外延展,陆续在云南晋宁、元谋姜驿、云南易门夕阳、武定万德、双柏安龙堡等地报道,但目前恐龙化石的报道均集中在楚雄盆地的中部及东部,而楚雄盆地的西部地区未有报道。笔者等通过全面系统的古生物化石调查,在滇西祥云地区下侏罗统冯家河组首次发现恐龙骨胳化石产地,对该新化石产地开展初步化石剖面调查和修理,共发现有5层恐龙化石富集层,部分化石保存较为完整,未经过长距离搬运,以原地埋藏保存为主,骨胳化石主要有肠骨、椎体、坐骨及肱骨等。这一发现拓宽了云南恐龙化石的分布范围,填补了楚雄盆地西部无恐龙化石的空白,丰富了云南早侏罗世恐龙化石库,为楚雄盆地西部古环境演化及地层对比提供了重要的古生物化石研究素材     

云南禄丰早侏罗世一新的原蜥脚类恐龙

云南禄丰下侏罗统下禄丰组产出一新的原蜥脚类孙氏细细坡龙(Xixiposaurus suni gen.et sp.nov.),其特征为:侧视头骨背缘向前强烈倾斜,下颌高度大于齿骨最小高度的两倍,颈椎体中第四颈椎体最长,耻骨裙宽度大于肠骨的耻骨突,股骨第四转子侧视具有V形切口。其系统位置比较进步,是禄丰发现的原蜥脚类中最进步的一种。     

冀东地区早侏罗世岩浆岩成因及其意义

冀东地区位于华北克拉通东部,区内中生代岩浆活动强烈,形成了大量不同时代的侵入岩,成为研究华北克拉通破坏过程的重要研究对象。本文在冀东青龙地区对蛇盘兔花岗岩和龙须门闪长岩进行了锆石离子探针定年,分别获得了1920±24Ma和1905±13Ma的年龄,结合前人在冀东其它地区获得的190～199Ma的不同岩体的锆石年龄,表明冀东地区早侏罗世是一重要的岩浆作用时期。青龙地区的早侏罗世岩浆岩由经历了不同程度结晶分异的中-酸性岩组成,它们的锆石ε_(Hf)(t)明显高于华北古老下地壳的范围,说明可能并不是完全由古老下地壳重熔产生。另一方面,蛇盘兔花岗岩和龙须门闪长岩的锆石ε_(Hf)(t)均具有较小的变化范围,结合它们极低的Cr、Ni含量,可以排除壳幔岩浆的直接混合。鉴于该地区在三叠纪岩浆岩中存在亏损地幔物质的加入,推测冀东青龙地区早侏罗世岩浆岩可能来源于三叠纪底侵作用形成的新生地壳与古老地壳的混合源区的部分熔融。     

中国辽西中侏罗世地层发现船颌翼龙新属新种

根据不完整的化石骨架,建立船颌翼龙一新属新种:李氏凤凰翼龙.它产自辽西中侏罗世的髫髻山组.具有以下特征:上颌有11对以上牙齿,最后一枚牙齿位置靠后,位于眶前孔后下角的下方.翼掌骨长度大约为肱骨的55%.凤凰翼龙的发现不但增加了船颌翼龙的新成员,而且对船颌翼龙的古地理分布提供了重要信息.它代表目前为止最早的船颌翼龙类.为我们了解船颌翼龙的起源和演化具有重要意义.     

New Jurassic Fossil True Bugs of the Pachymeridiidae(Hemiptera:Pentatomomorpha)from Northeast China

Four new fossil genera and species of true bugs from the family Pachymeridiidae, Beipiaocoris multifurcus, Bellicoris mirabilis, Nitoculus regiUus, and Viriosinervis stolidus, are described. New specimens were collected from the Middle and Upper Jurassic non-marine sedimentary strata from the Jiulongshan and Yixian Formations of northeast China. The species Karatavocoris asiatica Becker-Migdisova, 1963, which was considered to be a member of the family Coreidae is transferred to the Pachymeridiidae. A new map of all known and newly discovered fossil pachymeridiid localities is given. The diagnosis of the family is modified.     

浙东南英安质火山岩早侏罗世锆石SHRIMP年龄的首获及其地质意义

浙江中生代晚期火山岩极为发育,而有无中生代早期火山岩,则向无定论。本文在确认浙东南松阳毛弄煤矿一带煤系沉积下部火山岩属中生界毛弄组的基础上,测得其SHRIMP锆石U-Pb年龄为180±4Ma,首次证明浙江存在早一中侏罗世火山岩,同时表明浙东南尚没有确切的中侏罗世晚期至晚侏罗世火山岩活动记录,而且也缺失晚侏罗世和大部分中侏罗世地层。     

新疆吐鲁番—哈密盆地托克逊凹陷早侏罗世孢粉植物群及其意义

吐鲁番—哈密盆地托克逊凹陷早侏罗世地层中产孢粉化石共53属74种。通过对纵向上典型属种及优势组分含量变化规律的分析可划分为两个孢粉组合：Osmundacidites-Protopinus-Cycadopites组合和Cyathidites-Piceaepollenites-Cycadopites组合，它们分别产自八道湾组和三工河组。根据孢粉组合特征及与国内外有关化石群进行比较，八道湾组的时代应属早侏罗世早期；三工河组的时代应为早侏罗世晚期。托克逊地区当时的植被是由银杏、苏铁类和松柏类等乔木．并伴有真蕨类等草本植物组成。古气候应属亚热带气候。     

南昌地区发现的早侏罗世孢粉组合及其地质意义

南昌县岗上乡裴家Rk-4孔获得较丰富的孢粉化石,计有40属84种,含1新种。文中介绍了孢粉组合及其特征,讨论并阐明了含孢粉层位的地质时代为早侏罗世;并对该孔内地质构造问题发表了一些看法。