A New Titanosaurian Sauropod from Late Cretaceous of Nei Mongol, China

A specimen collected from the Upper Cretaceous Erlian Formation of Nei Mongol （Inner Mongolia）, China, represents a new genus and species of titanosaurian sauropod. The new taxon is named and described on the basis of the holotype and the only known specimen, which comprises several dorsal, sacral, and caudal vertebrae, several dorsal ribs, one anterior chevron, and much of the pelvis. Diagnostic features of the new species include a thick ridge extending down from the postzygapophysis on the lateral surface of the neural arch of the posterior dorsal vertebrae, a transversely oriented accessory lamina present between the anterior centroparapophyseal limina and the lateral centraprezygapophyseal lamina of the posterior dorsal vertebrae, long, anteroventrally directed caudal rib that bears two distinctive fossae on its posterior margin on the anterior caudal vertebrae and a prominent vertical ridge above the pubic peduncle on the medial surface of the ilium, among others. The ilium is pneumatic, a feature not common among non-avian dinosaurs. The new taxon has an unusual combination of primitive and derived character states. Preliminary character analysis shows a complex character distribution within the Titanosauriformes. Recent titanosauriform discoveries suggest that a significant radiation occurred in Asia early in the titanosauriform evolution.     

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.     

河南栾川晚白垩世秋扒组甲龙类化石的发现及意义

报道了河南省栾川县秋扒乡晚白垩世秋扒组发现的甲龙类化石。化石包括单枚牙齿、一几乎完整的背椎体、不完整的肋骨和坐骨。虽然化石材料少,难以确立属种,但是这是除中原龙产地外,中原地区发现的第二个甲龙类化石点。该化石的发现为研究甲龙类的迁徙及其古地理分布特点提供了重要信息。     

华南衡阳盆地上白垩统黄土类似物的初步研究

中国新生代黄土序列具有沉积速率高、连续性好等特点,记录了东亚地区持续的古气候动力学演化和重大地质事件信息。受区域构造-地貌和大气环流格局影响,中生代晚期华南发育了众多盆山型古沙漠系统且出露了巨厚的风成砂,但几乎未有学者提及黄土/黄土类似物的存在。本文通过粒度端元解析、野外露头的构型分析等手段,对衡阳盆地上白垩统红花套组进行了初步研究,识别出风成砂丘、砂席和泥滩等环境类型;并在泥滩环境中提取到黄土类似物的粒度组分信号,同时提出了黄土类似物的风成成因,总结了其形成-堆积过程。这项工作旨在探索白垩纪黄土类似物存在的可能性,为未来开展华南陆块中生代风尘记录研究提供契机。     

Lamniform sharks from the Cenomanian (Upper Cretaceous) of Venezuela

Sampling of Cenomanian fossil-rich horizons within the La Luna Formation of two localities in the Zulia and Trujillo states (northern Venezuela) yielded numerous shark teeth belonging to various species within the order Lamniformes (Mackerel sharks). Twelve lamniform species were identified including three new species (Squalicorax lalunaensis sp. nov., Squalicorax moodyi sp. nov., Acutalamna karsteni gen. et sp. nov.) and the genus Microcarcharias gen. nov. is proposed to accommodate with the peculiar morphology of the small-sized odontaspidid M. saskatchewanensis. Other taxa reported here include Cretoxyrhina mantelli, Cretolamna sp., cf. Nanocorax sp. and five Squalicorax species left in open nomenclature. This is the first report of chondrichthyans from the mid-Cretaceous of Venezuela and one of the few records of this group from the Cenomanian of South America. The composition of these assemblages suggests some degree of endemism in the La Luna Sea but also possible connexions with the Western Interior Seaway. One of the most striking features of these assemblages is the high anacoracid diversity (eight species) despite the corresponding outer shelf/upper slope palaeoenvironments of the La Luna Formation. The high diversity of these opportunistic predators is probably related to the high diversity of medium to large marine vertebrates that provided food resources.     

A New Sauropod Dinosaur from the Late Cretaceous Gaogou Formation of Nanyang, Henan Province

A new sauropod dinosaur Baotianmansaurus henanensis gen. et sp. nov. from the Cretaceous Gaogou Formation of Neixiang, Henan Province is erected. It is characterized by somphospondylous presacral vertebrae; a highly-developed lamina system on the dorsal vertebrae; transverse process supported by four laminae; and the dorsal portion of the anterior centroparapophyseai lamina is bifurcated, with a small branch extending to the ventral surface of the prezygapophysis. It represents a new titanosauriform sauropod.     

A New Sauropod Dinosaur from the Late Cretaceous Gaogou Formation of Nanyang,Henan Province

A new sauropod dinosaur Baotianmansaurus henanensis gen. et sp. nov. from the Cretaceous Gaogou Formation of Neixiang, Henan Province is erected. It is characterized by somphospondylous presacral vertebrae; a highly-developed lamina system on the dorsal vertebrae; transverse process supported by four laminae; and the dorsal portion of the anterior centroparapophyseal lamina is bifurcated, with a small branch extending to the ventral surface of the prezygapophysis. It represents a new titanosauriform sauropod.     

河南栾川地区晚白垩世脊椎动物群研究进展

栾川地区脊椎动物化石赋存在上白垩统秋扒组的中下部,时代可能为坎潘期晚期,以小型兽脚类恐龙骨骼为主。化石点大多分布在潭头盆地北部边缘2 km的范围,搬运距离不远。栾川动物群的化石组合包括至少8种恐龙（其中已命名6种）、2种蜥蜴类、2种哺乳类及数量众多的恐龙蛋等,代表一典型晚白垩世动物群,称为栾川动物群。栾川动物群与中国南方的赣州盆地和蒙古Nemegt盆地晚白垩世恐龙动物群具有很高的相似性,均以兽脚类恐龙为主,兼有其他脊椎动物组合。栾川动物群的研究对了解东亚晚白垩世恐龙动物群的生态面貌、恐龙多样性演化,以及环境变化对恐龙迁徙和灭绝的影响等具有重要意义。     

黑龙江三江盆地晚白垩世海浪组孢粉组合

依据东基三井1 226. 0～1 538. 0 m井段的孢粉鉴定结果,结合前人资料,首次将该井段孢粉组合命名为Cyathidites-Taxodiaceaepolleni-Aquilapollenites组合。其组合特征为:裸子植物花粉占48. 10%～78. 58%,蕨类孢子占2. 44%～34. 18%,被子植物花粉占0%～28. 26%;蕨类孢子中Cyathidites百分含量最高(0. 79%～37. 50%),其次是Cicatricosisporites (0%～12. 50%)和Leiotriletes (0%～10. 00%),重要分子有Appendicisporites、Schizaeoisporites、Lygodiumsporites和Lygodioisporites;裸子植物花粉中Inaperturopllenites的百分含量最高(11. 29%～38. 83%),其次是Taxodiaceaepollenites (12. 66%～28. 57%),重要分子有Tsugaepollenites、Parcisporites、Parvisaccites、Ephedripites和Classopollis等;被子植物花粉中Tricolpites的百分含量最高(0%～16. 46%),其次是Betulaepollenites (0%～15. 22%),含量较高的还有Momipites和Tricolporopollenites,重要分子有Aquilapollenites、Fibulapollis和Proteacidites等。该组合可以与松辽盆地嫩江组孢粉组合对比,地质时代为晚白垩世Santonian-Campanian期。鉴于宁安市南团子山、高家等露头区海浪组所产Estherites mitsuishii、E. liuxinensis、Tylestheria cf. shanhoensis、Halysestheria yui、Calestherites sp.和Brachygrapta? sp.等叶肢介化石群,系松辽盆地嫩江组常见分子,故将东基三井1 226. 0～1 538. 0 m井段划归为海浪组,废弃"七星河组"一名。     

江西省晚白垩世周田组的再划分

江西白垩纪晚世地层中发育一套湖相细碎屑岩系,前人称之为周田组,一直沿用至今.作者认为前人对该岩石地层单位的定义不够准确或不够贴切.该组并不是"普遍含膏盐层",而是仅在该组中部发育"膏盐层",所以,有必要重新厘定;鉴于"膏盐层"的特殊性、且明显区别于组内其余部分岩性,因此,建议将该岩系新建为段级岩石地层单位--"会昌膏盐段".这对当地乃至华南地区的陆相红盆的研究和地层划分对比、野外地质填图都具有重要意义,对寻找膏盐矿产资源也具有直接的指导作用.     

河南栾川晚白垩世秋扒组甲龙类化石的发现及意义

报道了河南省栾川县秋扒乡晚白垩世秋扒组发现的甲龙类化石。化石包括单枚牙齿、一几乎完整的背椎体、不完整的肋骨和坐骨。虽然化石材料少,难以确立属种,但是这是除中原龙产地外,中原地区发现的第二个甲龙类化石点。该化石的发现为研究甲龙类的迁徙及其古地理分布特点提供了重要信息。     

A new Late Cretaceous crocodyliform from the western margin of Gondwana (La Rioja Province,Argentina)

The Cretaceous witnessed the greatest diversity of Gondwanan notosuchian crocodyliforms, which displayed high levels of diversity and a notable array of specialized forms that developed in different ecological niches. Among this diversity, the advanced notosuchians are a clade of mid body sized forms which displays a remarkable abundance but is restricted to two lithological units from the Late Cretaceous of South America, the Adamantina Formation in southeastern Brazil and the Bajo de la Carpa Formation in Patagonia (Argentina). The only exceptions known so far were the Late Cretaceous Labidiosuchus from the Marilia Formation in Brazil and Yacarerani from the Cajones Formation in Bolivia. Herein we report a new Cretaceous crocodyliform, Llanosuchus tamaensis gen. nov. et sp. nov., found in the Los Llanos Formation (Campanian?) in northwestern Argentina (La Rioja Province). The small specimen includes well preserved fragments of the cranium and mandible with an estimated skull size of about 9 cm lengths. This crocodyliform shares several derived characters with Notosuchus terrestris from the Bajo de la Carpa Formation (Patagonia) and it was found in a weakly developed sandy paleosol profile formed in wet local conditions but in a region characterized by semi-arid climate and active eolian sedimentation. The presence of a new advanced notosuchian in the Cretaceous of western Gondwana, and its intermediate geographical region between the known South American species (Brazil, Argentina and Bolivia), has interesting implications, and adds another record of an advanced notosuchian in deposits with inferred warm climates and semi-arid paleoenvironments. Finally, Llanosuchus tamaensis supports a Late Cretaceous age for Los Llanos Formation with important geological implications for La Rioja Province.     

Ostracod Biostratigraphy of the Late Cretaceous Qingshankou Formation in the Songliao Basin

An ostracod biostratigraphic study was performed on 425 samples from the composite geological section constructed by using cores taken from five selected wells drilled in the Late Cretaceous Qingshankou Formation in the Songliao basin.A total of 19 ostracod zones are established in the formation,of which 3 are newly established and 3 are revised.The 19 ostracod zones are described in detail.This study provides a basis for the detailed stratigraphic division and correlation of the Qingshankou Formation and the Gaotaizi oil reservoir in the oilfield in the Songliao basin.     

Late quaternary palaeoclimate in the savannas of South America

The paper reviews Late Quaternary palynological evidence from eight sites in the savannas of northern South America. The sites reviewed are Lake Valencia (10°N), Carajas (6°S), Aguas Emendadas (15°S), Crominia (17°S), Salitre (19°S), Lagoa de Serra Negra (18°S), Lagoa Santa (20°S) and Lagoa dos Olhos (20°S). Four of the sites show evidence for a climate more humid than at present from ca. 36 ka BP to ca. 22–18 ka BP. Maximum dryness was reached at 14 ka to 10.5 ka BP at Lake Valencia. There was an increase in moisture from 8.8 ka BP at Lake Valencia and from 7 ka BP in Central Brazil. The presence of charcoal indicates human impact from ca. 8.6 ka BP. ©1997 John Wiley & Sons, Ltd.     

华南长城岭晚白垩世斜斑玄武岩的岩浆作用过程与岩石成因制约

斜斑玄武岩能较好地记录岩浆作用过程、动力学机制和构造环境。本文对华南南岭中段晚白垩世长城岭斜斑玄武岩的斜长石环带结构进行了详细研究,以制约其岩浆作用过程和岩石成因机制。长城岭斜斑玄武岩富集大离子亲石元素,亏损Nb-Ta,具强烈Pb正异常和轻微Ti正异常;其全岩~(87)Sr/~(86)Sr较高且较均匀(0.7088~0.7089),较低(-0.95~-0.94),而斜长石斑晶原位~(87)Sr/~(86)Sr变化相对较大(0.706~0.710)。斜长石斑晶普遍显示反环带结构,从核部到边部的An组分以及MgO、FeO、TiO_2含量明显升高而K_2O含量降低;另外,反环带结构斜长石斑晶的核部An含量不均匀,但边部成分一致,指示岩浆补给作用。总体上,斜长石斑晶的边部相对较窄,指示补给岩浆在岩浆房中的驻留时间较短,补给岩浆的加入造成了玄武岩浆的快速喷发。斜长石斑晶的~(87)Sr/~(86)Sr比值与Sr含量呈负相关关系,表明岩浆房演化过程中存在地壳物质的同化混染作用。~(39)Ar-~(40)Ar定年结果显示,由基质斜长石获得的坪年龄(83.45±0.44Ma)略老于由斜长石斑晶获得的坪年龄(79.02±0.43Ma),为驻留时间较短的补给岩浆受地壳混染作用影响而具有偏低的初始~(39)Ar/~(40)Ar的结果。长城岭斜斑玄武岩在2Nb-Zr/4-Y图解中落在板内拉斑玄武岩区域内,并具有与板内拉斑玄武岩相似的斜长石An(60~70),应形成于板内拉张环境。华南地区晚白垩世基性岩浆活动,包括沿海地区的永泰玄武岩(~85Ma)和内陆地区的长城岭斜斑玄武岩(~79Ma)、衡阳玄武岩(~70Ma)及禾埠玄武岩(~63Ma)等,显示逐渐从岛弧玄武岩转变为板内碱性玄武岩的趋势,其Sr-Nd同位素也显示逐渐亏损的特征;它们的时空分布特征表明,华南内陆在晚白垩世期间经历了持续的拉张作用,可能与古太平洋板块后撤有关。     

豫西栾川地区晚白垩世秋扒组一新的驰龙类化石

根据以下特征，建立驰龙类恐龙一新属新种——河南栾川盗龙（Luanchuanraptor henartens／sgen．et sp．nov）：牙齿后缘每5mm有24个小锯齿；前部背椎椎体具有小的椎体侧孔；后部脉弧的前后突短且为三分支；最后部的尾椎体的椎体前突拉长且包裹与其相邻的前部椎体，两椎体前突之间夹有低的刀片状的神经棘；乌喙骨的内面强烈凹陷；肱骨骨干直，肱骨三角脊几乎占肱骨长度的前部一半。河南栾川盗龙代表除在亚洲戈壁地区及中国东北地区之外发现的第一件驰龙类化石标本。     

豫西栾川地区晚白垩世秋扒组——新的驰龙类化石(英文)

根据以下特征,建立驰龙类恐龙一新属新种——河南栾川盗龙(Luanchuanraptor henanensisgen.etsp.nov):牙齿后缘每5mm有24个小锯齿;前部背椎椎体具有小的椎体侧孔;后部脉弧的前后突短且为三分支;最后部的尾椎体的椎体前突拉长且包裹与其相邻的前部椎体,两椎体前突之间夹有低的刀片状的神经棘;乌喙骨的内面强烈凹陷;肱骨骨干直,肱骨三角脊几乎占肱骨长度的前部一半。河南栾川盗龙代表除在亚洲戈壁地区及中国东北地区之外发现的第一件驰龙类化石标本。     

山东晚白垩世一新的巨龙类恐龙

记述了产自山东诸城上白垩统王氏群中一个较完整的蜥脚类恐龙肱骨(ZJZ-57)。它具有一些进步特征,如肱骨三角胸嵴向远端扩展,肱骨近端外侧1/3处发育隆凸,表明其属于较进步的巨龙类成员。另外,它具有一些独特的鉴定特征组合区别于其他任何巨龙类:近端横向强烈扩展,近端最大宽度与骨干长度之比为0.55;骨干粗壮,粗壮指数为0.39。综合研究表明,ZJZ-57所属个体代表了一种新的巨龙类恐龙:臧家庄诸城巨龙(Zhuchengtitan zangjiazhuangensis gen.et sp.nov.),它可能与Opisthocoelicaudia的亲缘关系较接近。这是山东晚白垩世地层中首次发现的巨龙类恐龙。     

浙江天台晚白垩世蛋化石生物地层研究

晚白垩世天台盆地产有丰富的恐龙蛋化石和恐龙骨骼,目前发现17处化石点,分布于街头镇、平桥镇、白鹤镇、坦头镇、屯桥乡以及县城-国清寺-下朱村一带,面积约为230 km2.特别在城关北侧三角区内,面积仅有15 km2,却是天台县化石点集中区域.这些恐龙蛋化石为原地埋藏,产于上白垩统两头塘组和赤城山组.本文初步描述7种类型恐龙蛋化石:天台长形蛋(新种)Elongatoolithus tiantaiensis sp. nov.、国清寺树枝蛋(新种) Dendroolithus guoqingsiensis sp. nov.、张氏巨型长形蛋(新种)Macroelongatoolithus zhangi sp. nov.、张头槽圆形蛋(新种) Spheroolithus zhangtoucaoensis sp. nov.、石嘴湾副圆形蛋(相似种) Paraspheroolithus cf. shizuiwanensis、树枝树枝蛋(相似种)Dendroolithus cf. dendriticus、椭圆形蛋(未定种) Ovaloolithus sp. .     

渝东南正阳盆地晚白垩世构造—沉积演化

重庆黔江正阳盆地位于川东南—湘鄂西隔槽式褶皱带中,发育上白垩统正阳组,其1段为冲、洪积相砾岩,2段为河、湖相砂岩、粉砂岩,含丰富的恐龙化石。该盆地是燕山运动在川东南—湘鄂西隔槽式褶皱带中形成的典型山间盆地,研究该盆地的构造—沉积演化对探讨晚白垩世渝东南构造演化具有重要意义,但目前针对该盆地的研究较少。本研究通过测量和分析正阳组中的沉积、构造特征,探讨了盆地的控盆断裂、古水流方向、沉积物来源以及构造演化史。对正阳组古流向恢复的研究表明,其物源主要来自西侧。燕山期,北西—南东向的区域挤压作用在川东南地区形成了广泛分布的节理系及逆冲断层,这些断层随着挤压应力的持续将各滑脱层连通,岩层在断坡附近堆叠,背斜扩展,逐渐形成隔槽式褶皱。燕山末期,渝东南地区在局部拉张的构造背景下发育了正断层——“阿蓬江断裂”,其控制了正阳盆地的形成,并形成“东断西超、东低西高”的古地理格局,西侧地质体为盆地提供物源,沉积了正阳组。此后,局部挤压使得该地区抬升,遭受剥蚀,南侧抬升剥蚀较北侧明显。