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1.
中国东北晚中生代的含火山灰夹层的湖相沉积中已经发现了三种无尾两栖类 (三燕丽蟾、葛氏辽蟾、北票中蟾 )和六种有尾两栖类(东方塘螈、钟健辽西螈、奇异热河螈、凤山中华螈、天义初螈、道虎沟辽西螈 ) ,它们多数是热河生物群的代表。这些两栖类是我国发现的第一批中生代滑体两栖类 ,以具有较早的地质年代、精美的保存状态和较大的物种分异度而区别于世界其他地区的两栖类。其中的无尾两栖类比世界典型侏罗纪种类更进步 ,处于较高的演化阶段 ,从而支持化石层时代是侏罗纪之后的观点。六种有尾两栖类都具有单头的肋骨 ,显示其演化阶段处于隐… 相似文献
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应用LA-ICPMS锆石U-Pb测年方法,对内蒙古宁城道虎沟生物群和辽西凌源热水汤与建平马杖子地区含蝾螈类化石层上、下火山岩进行了定年研究。测年结果表明,道虎沟生物群(岩系)最年轻年龄约束为158Ma,最老年龄约束为164Ma。综合研究表明,宁城道虎沟生物群与凌源热水汤和建平马杖子一带含蝾螈类化石层属于同一生物群(时代)。道虎沟生物群发育于164～158Ma的地质年代期间,地层柱上属于中侏罗世晚期。同时,依据道虎沟生物群及上覆火山岩被晚侏罗世土城子组及早白垩世含热河生物群岩系平行不整合覆盖,下部平行不整合于由砾岩、砂泥岩夹煤线或薄… 相似文献
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内蒙古宁城一带出露的道虎沟化石层以产出保存精美的脊椎动物化石而闻名。该化石层的时代最初根据错误报道的热河生物群重要分子的出现而误认为属早白垩世。但是,精确可靠的区域生物地层学和同位素测年研究,结合古生物学证据,支持该化石层属于中侏罗世的时代推论。然而,新近有些文章提出道虎沟地层层序倒转的论点,从而再次引起关于道虎沟化石层时代问题的争论。本文研究通过回顾和评估各方面有关资料发现并无证据支持道虎沟地层层序倒转的论点。此外,作为道虎沟化石层时代晚于中侏罗世的理论基础的许多推想,逻辑上令人费解,或是自相矛盾,或… 相似文献
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再论道虎沟生物群的时代 总被引：14，自引：1，他引：14
内蒙古宁城道虎沟地区的晚中生代地层十分发育，产状平缓，主要为一套产有丰富动、植物化石的凝灰质泥岩和粉砂岩，并夹有数层火山岩。从区域上来看，在西台子一带主要为早白垩世义县组的地层，产有丰富的热河生物群的化石，常见者有鱼类Lycoptera davidi，Peipiaosteus pani，Yanosteus longidorsalis，Protopsephurus liui和鸟类Confuciusornis anctus；但在道虎沟—小西沟一带主要为中—晚侏罗世髫髻山组的地层，产有丰富的道虎沟生物群的化石，常见者有蝾螈Jeholotriton paradoxus和Chunerpeton tianyiensis，翼龙Jeholopterus ningchengensis和Pterorhynchus wellnhoferi，手盗龙类Scansorio pteryxheilmanni和（？）Pedopenna daohugouensis[本文对Xu等（2005）描述的道虎沟足羽龙（Pedopennad aohugouensis）的原始产地存有疑义]，昆虫Mesobaetis sibirica，Mesoneta antiqua，Rhipidoblattina（Canaliblatta）hebeiensis，Brunneus haifanggouensis，Palaeontinodes haifanggouensis等，叶肢介Euestheria zilu jingensis，E．haifanggouensis，E．jingyuanensis和E．1uanpingensis，植物Cladophleln＇s（Osmunda？）sp．，Anomozamites angulatus，A．（Trymia？）sp．，Cycadolepissp．，Gmkgotes sp．，Pityospermus sp．，Pityocladus sp．，Zamitesgigas，Yanliaoiasmensis和Coniopteris burejem括等。根据区域地质构造、地层分布、生物群特征和地质年代学资料分析，笔者确信道虎沟生物群的时代为中—晚侏罗世（卡洛夫阶—牛津阶），根本不可能将其归于早白垩世热河生物群。 相似文献
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内蒙古宁城盆地东南缘含道虎沟生物群岩石地层序列特征及时代归属 总被引：18，自引：3，他引：18
宁城盆地东南缘晚中生代岩石地层序列完整、连续，但该岩石地层序列及其所含生物群的地质年代归属问题还存在争议。含道虎沟生物群岩石地层剖面的发现和实测表明，研究区晚中生代地层序列从下至上由中侏罗世九龙山组—髫髻山组、晚侏罗世土城子组和早白垩世义县组组成。九龙山组—髫髻山组下部以沉积岩系为主，产道虎沟生物群，上部为中、基性火山岩，SHRIMP锆石U-Pb年龄为152Ma和164～165Ma。九龙山组—髫髻山组地层序列既为土城子组平行不整合覆盖，而且二者又同时被早白垩世义县组角度不整合覆盖。含道虎沟生物群的晚中生代岩石地层的地质年代早于热河生物群，为中侏罗世的产物，现暂将其统并为九龙山组—髫髻山组。 相似文献
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辽西凌源热水汤地区中生代含蝾螈化石地层新知 总被引：4，自引：0，他引：4
在辽西凌源热水汤地区新发现一套夹于中酸性和酸性火山岩中的含蝾螈等化石的沉积层,可以称之为热水汤层.该层所产蝾螈化石特征类似于内蒙宁城县山头乡道虎沟地区海房沟组的初螈类,其伴生植物化石组合显示介于中侏罗世海房沟组至早白垩世义县组之间的特征,其时代置于中侏罗世晚期较为合适.同时,将热水汤层及其上覆、下伏酸性和中酸性火山岩一并划归髫髻山组. 相似文献
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本文描述了热河生物群中2个水虿新种：Gomphus? biconuexus sp．nov,和Aeschna?acrodonta sp．nov．,它们分别属于Gomphidae科和Aeshnidae科。化石采自辽西北票黄半吉沟义县组下部(晚侏罗世-早白垩世早期)。 相似文献
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自中、晚侏罗世之交至早白垩世早期,中国东部发生了构造格局和古地理环境的巨大转变。对这一时期燕辽东段古地理和古环境的部分问题进行了多学科整合分析,初步认识如下:中侏罗世开始增强的板块汇聚造成中、晚侏罗世亚洲东部地壳增厚和地势升高,古太平洋伊泽纳崎板块持续俯冲引起深部岩浆上涌、地壳减薄和多期伸展裂陷,同时东亚洋陆过渡带形成一系列逃逸构造,上述构造演化导致燕辽地区在晚侏罗世至早白垩世中期形成高山和盆岭地貌。早白垩世137~131 Ma,嫩江—八里罕断裂至喀喇沁变质核杂岩延伸线两侧出现东高西低的地貌差异,相对下降的冀北—大兴安岭火山-地堑带地层中赋存热河生物群早期化石组合,而辽西—松辽地区为相对隆升的构造高地。130~110 Ma时期裂陷作用扩展,热河生物群中、晚期组合向周围扩散。热河生物群生存时期总体为以干冷为主的温带大陆性气候,这与中生代中国东部高原的潜在环境效应并不矛盾。全球气候演化和区域构造古地理条件共同导致燕辽地区自晚侏罗世至早白垩世的干旱化和寒冷化,并影响到中、晚侏罗世燕辽生物群和早白垩世热河生物群之间的生态群进化演替。 相似文献
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道虎沟生物群(前热河生物群)的发现及其地质时代 总被引：31，自引：1，他引：31
根据最新发现的动、植物化石 ,确立了“道虎沟生物群”,这一新的生物群属前热河生物群 ,生存时代大体相当于晚侏罗世的牛津期 (Oxfordian)至基末利期 (Kim meridgian)。这一发现大大补充了我国这一地质时期贫乏的化石记录 ,为探讨热河生物群的起源提供了较丰富的第一手材料。 相似文献
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中国中侏罗世哺乳动物研究新进展 总被引：3，自引：0，他引：3
本文介绍了中国北方东部地区发现的几种中侏罗世哺乳动物:纤细辽兽、獭形狸尾兽、远古翔兽和粗壮假碾磨齿兽,除纤细辽兽发现于辽宁凌源房身九龙山组外,其他3种哺乳动物化石均发现于内蒙古宁城道虎沟地区的髫髻山组.这些哺乳动物化石的发现不仅丰富了我国中侏罗世生物群的组成,加深了人们对于中侏罗世哺乳动物多样性的认识,而且为解决我国北方东部地区晚中生代地层的划分和对比提供了可靠的古生物证据. 相似文献
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Radiometric Dating of Ignimbrite from Inner Mongolia Provides no Indication of a Post-Middle Jurassic Age for the Daohugou Beds 总被引：5，自引：0，他引：5
GAO Ke-Qin REN Dong 《《地质学报》英文版》2006,80(1):42-45
1 Introduction and Background Along with stunning paleontological discoveries from the world-renowned fossil beds in western Liaoning Province of China, recent findings from the lacustrine deposits exposed at the Daohugou village (Fig. 1) near Ningcheng, Inner Mongolia, include superbly preserved pterosaur, salamander, insect, and plant fossils (Ji and Yuan, 2002; Wang et al., 2002; Gao and Shubin, 2003; Zheng et al., 2003; Rasnitsyn and Zhang, 2004). The Daohugou fossil beds consist of… 相似文献
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热河生物群是分布于亚洲东部早白垩世的著名古生物化石群,地质时代距今120~131 Ma. 早期研究认为,热河生物群主要分布于中国冀北、辽西等地区. 直到20世纪80年代内蒙古地区开展专题区域地质研究,才陆续发现了许多新的热河生物群化石分布区域和重要的化石产地. 通过对内蒙古自治区东、西部白垩纪热河生物群分布特征及地层对比研究,明确了内蒙古热河生物群分布区域、产出层位、组合差异及古气候和古环境演变规律,进一步理清了内蒙古地区白垩纪沉积古地理、古气候和古环境演变与热河生物群辐射演化的制约和协同关系. 相似文献
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内蒙古宁城县道虎沟叶肢介化石群的时代 总被引：29，自引：0，他引：29
内蒙古赤峰宁城县道虎沟含丰富的叶肢介壳瓣及许多珍罕的软体化石 ,计有 1属 4种 :Euestheria ziliu-jingensis Chen,Euestheria haifanggouensis Chen,Euestheria jingyuanensis Chen,Euestheria luanpingensis Shen etNiu。这些分子都是我国中侏罗世早期自流井真叶肢介 (Euestheria ziliujingensis)动物群的重要成员 ,以个体较小、壳瓣圆或椭圆形、生长带具小网状装饰、种类单调、密集群生为特点 ,主要出现于中侏罗世早中期 (Bajocian- MiddleBothonia)。特别是 Euestheria luanpingensis Shen et Niu及其软体化石在道虎沟的发现 ,证明其层位应与冀北滦平九龙山组相当。道虎沟叶肢介群与中侏罗世晚期的假线叶肢介 (Pseudograpta)动物群的面貌相差甚远 ,与比其层位更高的大北沟组的尼斯脱叶肢介 (N estoria)动物群及义县组的东方叶肢介 (Eosestheria)动物群迥然不同 . 相似文献
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LIU Yanxue LIU Yongqing ZHANG Hong 《《地质学报》英文版》2006,80(5):733-742
LA-ICPMS Zircon U-Pb dating is applied to volcanic rocks overlying and underlying the Salamander-bearing bed in the Daohugou beds of Ningcheng in Inner Mongola and Reshuichang of Lingyuan and Mazhangzi of Jianping in western Liaoning. The results indicate that the youngest age of the rocks in Daohugou of Ningcheng is 158 Ma, and the oldest one is 164 Ma. Synthesized researches indicate that the salamander-bearing beds in Daohugou of Ningcheng, Reshuichang of Lingyuan and Mazhangzi of Jianping were developed in the same period. The Daohugou beds were formed in the geological age of 164-158 Ma of the middle-late Jurassic. Whilst, the Daohugou beds and its corrdative strata should correspond to the Tiaojishan Formation （or Lanqi Formation） of the middle Jurassic in northern Hebei Province and western Liaoning Province, based on the disconformity between the Daohugou beds and its overlaying beds of the Tuchengzi Formation of Late Jurassic and the Jehol Beds of early Cretaceous, and the disconformity between the Daohugou Beds and its underlying Jiulongshan Formation, which is composed of conglomerate, sandstone, shale with coal and thin coal beds. 相似文献
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A new genus and species of fossil elaterid namely Clavelater ningchengensis gen. et sp. nov. assigned to the subfamily Protagrypninae based on one specimen from the Middle Jurassic Jiulongshan Formation near Daohugou Village, Ningcheng County, Inner Mongolia, northeastern China is described and illustrated. This specimen displays a pair of large antennae that easily differs from those of most Mesozoic elaterids. There are around 36 species within 20 genera referred to elateroids described from the Early Jurassic to Miocene of China, with another three species within three genera reviewed, but the taxonomic assignment of at least seven species within three genera is doubted. The systematic position of fossil elateriform beetles reported from China is reviewed and the evolution of Mesozoic elateroids briefly discussed. 相似文献
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Until now, all Chinese palaeontinids have come from northern China and are more diverse than any other hemipterous insects in the Mesozoic. Most palaeontinids have been discovered from the area encompassing northern Hebei, the Ningcheng area of Inner Mongolia and western Liaoning. The difference in ubiquity of fossil records between northern and southern China is probably related to taphonomical and collecting bias. Records of Early and Late Jurassic palaeontinids are very scarce. The highest diversity of palaeontinid species occurs in the Middle Jurassic of Daohugou Lagersttte. Early Cretaceous palaeontinids of China are restricted to the typical distribution of Jehol Biota. Palaeontinodes sp. is described from the Lower Cretaceous Yixian Formation of Yangshuwanzi, Inner Mongolia and is the only Palaeontinodes specimen from the Cretaceous. Plachutella exculpta Zhang, 1997 from the Lower Jurassic Badaowan Formation of Karamai, Xinjiang is re-described and some previously reported species of this genus are discussed. 相似文献
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A taxon of the Stenophlebiidae, Yixianstenophlebia magnifica gen. et sp. nov., is described from the Lower Cretaceous Yixian Formation at Liutiaogou, Ningcheng County, Inner Mongolia of China. Its closest relative is the Late Jurassic European genus Stenophlebia. This new discovery is helpful to understand the Jehol Biota assemblage at Liutiaogou Locality. It also confirms that the Stenophlebiidae was a very diverse and widespread family during the Early Cretaceous. The causes of its extinction in the Late Cretaceous remain enigmatic. 相似文献
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Diverse caddis flies are recently collected from the Middle Jurassic Daohugou fauna in Ningcheng County, Inner Mongolia, northern China, and different types of caddis cases have been reported in the same locality. A new species of caddisfly, Liadotaulius daohugouensis sp. nov. is described and illustrated; the establishment is based on a well-preserved isolated forewing collected from the Middle Jurassic Jiulongshan Formation of Daohugou. The family status of Liadotaulius is discussed on the basis of new material and is referred to the family Philopotamidae. The Daohugou fauna continues to provide new data for studying the early evolution of Trichoptera. 相似文献