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滇中含中侏罗世海相化石地层之上连续沉积的麻地山组、安宁组和妥店组,时代应为晚侏罗世,产川街叶肢介、似东方叶肢介、云南雕饰叶肢介等化石,具有美丽的"滨生长线瘤"构造,形成特提斯区特有的叶肢介动物群。在冀北宣化堰家沟后城组首次发现特提斯区极为发育的川街叶肢介化石,进一步证明后城组完全可以与滇中地区上侏罗统麻地山组-安宁组-妥店组对比,后城组的时代应为晚侏罗世,可能更近于晚侏罗世早—中期。川街叶肢介化石在后城组的发现,为环太平洋带的纯陆相后城组与特提斯区由海相化石推定的上侏罗统对比提供了古生物化石的有力佐证,具有重要的地层对比意义。 相似文献
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侏罗纪在全球范围内属于重要的产煤期，然而此时云南、四川中-南部没有煤系出现，反而发育了一套独特的“红色岩系”。在这样的环境中生活并繁盛着蜥脚亚目等形形色色的恐龙，与中国北部、东部地区的恐龙类群有明显的差异。马门溪龙在中国主要发现于四川，最近在云南侏罗纪“红层”中发现云南马门溪龙(新种)尚属首次，再次证实禄丰一带存在上侏罗统。该化石产于禄丰川街盆地老长箐-大尖峰剖面，在其下部地层中还分别产出代表中侏罗世的川街龙和早侏罗世的禄丰龙化石。能在同一完整地层剖面上见到不同时段早、中、晚侏罗世3套恐龙动物群，这在国内外都是罕见的。 相似文献
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云南禄丰地区首次发现晚侏罗世早期轮藻化石组合 总被引：2，自引：2，他引：0
近年来云南禄丰地区在地层学方面有两项重要的进展：①川街盆地不仅具有“禄丰晰龙动物群”, 在其上部还相继发现了中侏罗世“川街龙动物群”和相当晚侏罗世的恐龙化石;②按照国际地层规范,厘定并新建了一套侏罗纪岩石地层单位。新近又在前人称之为“上禄丰组”下部（川街组）及“酒红层”（麻地山组）中分别鉴定出中侏罗世轮藻组合Aclistochara maanshanensis-Aclistochara abshirira-Aclistochara karierica和晚侏罗世早期轮组合Aclistochara jaisalmerensis-Aclistochara karierica-Mesochara voluta。这一晚株罗世早期轮藻化石组合在中国属首次发现。 相似文献
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侏罗纪在全球范围内属于重要的产煤期,然而此时云南、四川中-南部没有煤系出现,反而发育了一套独特的“红色岩系“.在这样的环境中生活并繁盛着蜥脚亚目等形形色色的恐龙,与中国北部、东部地区的恐龙类群有明显的差异.马门溪龙在中国主要发现于四川,最近在云南侏罗纪“红层“中发现云南马门溪龙(新种)尚属首次,再次证实禄丰一带存在上侏罗统.该化石产于禄丰川街盆地老长箐-大尖峰剖面,在其下部地层中还分别产出代表中侏罗世的川街龙和早侏罗世的禄丰龙化石.能在同一完整地层剖面上见到不同时段早、中、晚侏罗世3套恐龙动物群,这在国内外都是罕见的. 相似文献
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塔里木盆地草湖凹陷侏罗系发育较全,沉积厚度大,但地层划分对比精度低,是制约该区油气勘探重要因素之一.本文据多口钻井样品获得丰富化石资料建立了3个孢粉组合,即Cyathidites-Osmundacidites-Piceites,Cyathidites-Neoraistrickia-Disacciatrileti与Cyathidites- Classopollis-Piceaepollenites组合;1个大孢子组合,即Aneuletes cucuma高含量组合;两个轮藻组合,即A.stellerides-A.lufengensis与A.maxima-P.kucheensis组合.将草湖凹陷侏罗系划分为3统6组,自下而上为下侏罗统阿合组、阳霞组,中侏罗统克孜勒努尔组、恰克马克组,上侏罗统齐古组(缺失喀拉扎组),各段岩电特征极明显.阳霞组下段煤层、上段黑色泥岩段,克孜勒努尔组煤层及齐古组红色泥岩段可作为区域地层对比标志层,指出大部分地区阿合组与阳霞组下部为沉积缺失,恰克马克组至喀拉扎组为剥蚀缺失.层序地层共划分为个3个Ⅱ级、5个Ⅲ级层序,以生物地层为依据,结合岩石地层、层序地层与测井地层,对该区侏罗系进行详细地层划分与对比,为沉积相、构造演化及油气成藏等深入研究奠定了地层学基础. 相似文献
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禄丰老长阱含新的蜥龙动物群地层剖面研究 总被引：4，自引：0，他引：4
详细介绍禄丰县街乡老长阱村附近侏罗系剖面,并与禄丰盆地侏罗系剖面进行对比,对老长阱上禄井组（中侏罗统）蜥龙动物群的性质人予确认,改写了自１９３８年研究禄丰群以来,上禄丰组无蜥龙动物群的历史,对研究蜥脚类恐龙的起源和进化,提供了重析实际资料。 相似文献
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(1) Through the discovery of determinable fossils in the so-called "RedBeds" at Lufeng, Yunnan, parts of these beds have been accurately dated. (2) The name "Shihmen Series" is proposed for the unfossiliferouscapping escarpment sandstones. (3) The name "Lufeng Series" is proposed for the fossiliferous bedswhich lie disconformably under the Shihmen Series and unconformably abovethe pre-Cambrian Metamorphic Series (in the Lufeng area). 相似文献
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记述了云南省禄丰县腰站乡下侏罗统禄丰组2个恐龙足迹,命名了棋盘张北足迹（Changpeipus pareschequier ichnosp. nov.）一新种。这是在禄丰组中首次发现恐龙足迹化石,重新观察并修订了张北足迹一属的属征。滦平张北足迹（Changpeipus luanpingeris）应为石炭张北足迹（Changpeipus carbonicus）的亚成年个体,为同物异名。此前被认为是石炭张北足迹（Changpeipus carbonicus）前足迹的IVPP V2472 2a,应为其未成年体的后足迹。张北足迹与卡岩塔足迹（Kayentapus）类似。综合种种特征,棋盘张北足迹（新种）的造迹恐龙很可能为禄丰组的腔骨龙类（Coelophysoidea） 相似文献
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滇中鱼坝村组的建立及陆相侏罗系底界 总被引：6，自引：0，他引：6
滇中及相邻地区上三叠统舍资组含煤层与下侏罗统冯家河组红层之间，连续沉积了一套杂色细碎屑岩过渡层。其分布稳定，该层所含化石及磁性地层特征表明其时代属早侏罗世。因此建立下侏罗统鱼坝村组，并确定该组底界为陆相侏罗系的底界。 相似文献
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西江凹陷和陆丰凹陷均位于南海北部珠江口盆地珠一坳陷,前者盆地结构为两条NE向铲式边界断层控制的近对称地堑,后者表现为6条弯曲主干断层控制的“两洼夹一隆”构造格局。文章运用三维地震资料,在盆地结构、断裂系统描述的基础上,选取了两个凹陷共8条地震—地质剖面进行平衡剖面恢复,计算两幕裂陷阶段盆地伸展量、拆离深度等定量参数,并据此分析二者差异裂陷演化过程及与区域构造演化之间的联系。两个凹陷在新生代均经历裂陷一幕、二幕以及裂后拗陷阶段,其中每幕裂陷又可细分为早、晚两个亚幕。西江和陆丰凹陷的裂陷演化具有时空差异性。从裂陷一幕到二幕,二者伸展量都具有随时间减小的一般特征,其中西江凹陷的伸展量随时间持续减小,在裂陷二幕晚期仍具有较大伸展量,而陆丰凹陷在裂陷二幕早期伸展量略有升高,但在晚期伸展量急剧减小,其减弱程度远大于西江凹陷。两个凹陷的拆离深度都具有随时间逐渐加深的特征。在裂陷一幕早、晚亚幕,陆丰凹陷的拆离深度略大于西江凹陷。在裂陷二幕早、晚亚幕,西江凹陷的平均拆离深度由约8 km增长至9 km左右,而陆丰凹陷的平均拆离深度由约8 km跳跃式增长至约35 km。盆地的几何结构、断裂系统以及伸展量和拆离深度变化特征均反映陆丰凹陷在裂陷二幕晚期受热沉降作用或提前结束裂陷阶段,而西江凹陷在裂陷二幕之后结束裂陷作用。研究区的裂陷阶段自东向西逐渐结束可能受控于东北次海盆的扩张及南海的自东向西渐进式扩张。区域板块构造演化提供了珠江口盆地沿其轴向向SW方向伸展作用增强的差异伸展环境。该研究所揭示的盆地裂陷演化差异性对认识珠江口盆地的裂陷时限的时空分布和差异裂陷演化都具有重要的意义,也对认识南海北部大陆边缘裂陷过程提供重要的定量数据约束。 相似文献
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An incomplete dinosaur skeleton,including a partial skull,recently discovered from the Lower Jurassic Lufeng Formation of Yunnan,China,is here reported.Apart from its small size,little anatomical evidence supports,a priori,the non-adult status of this new sauropodomorph specimen but osteohistological analyses suggest that it is a fast-growing juvenile. This specimen represents only the second occurrence of a juvenile non-sauropodan sauropodomorph in the Lufeng Basin. The anatomy of the new specimen does not match that of other Lower Jurassic immature specimens;although cranial material is preserved,it does not display the diagnostic characters of early sauropodomorphs from the same horizon,namely Lufengosaurus,Yizhousaurus and Yunnanosaurus.Our phylogenetic analysis places the new specimen in a position relatively distant from other Chinese sauropodomorphs,and corroborates the anatomical evidence showing it is not referable to any known species already excavated in Yunnan.This result is interpreted with caution considering that ontogeny affects phylogenetic reconstruction.A thorough comparison with adult forms,taking into account ontogeny-related characters,suggests that this Lufeng juvenile might represent a previously unknown species of early sauropodomorph. 相似文献
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A new theropod dinosaur,Shidaisaurusjinae gen.et sp.nov.,has been described on the basis of an incomplete skeleton.The specimen was found near the base of the Upper Lufeng Formation(early Middle Jurassic)in Yunnan,China.It is the first theropod dinosaur from the Middle Jurassic of Yunnan.Shidaisaurus jinae is distinguishable from other Jurassic theropods by certain features from the braincase,axis,and pelvic girdle.The absence of any pleurocoels in the axis or in any anterior dorsal vertebrae suggests that the new Lufeng theropod is relatively primitive and more plesiomorphic than most of the Middle to Late Jurassic theropods from China.Most Chinese taxa of Jurassic theropod dinosaurs have not been well described;a further detailed study will be necessary for us to determine their phylogenetic relationships with Shidaisaurus jinae. 相似文献
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A new theropod dinosaur, Shidaisaurus jinae gen. et sp. nov., has been described on the basis of an incomplete skeleton. The specimen was found near the base of the Upper Lufeng Formation (early Middle Jurassic) in Yunnan, China. It is the first theropod dinosaur from the Middle Jurassic of Yunnan. Shidaisaurus jinae is distinguishable from other Jurassic theropods by certain features from the braincase, axis, and pelvic girdle. The absence of any pleurocoels in the axis or in any anterior dorsal vertebrae suggests that the new Lufeng theropod is relatively primitive and more plesiomorphic than most of the Middle to Late Jurassic theropods from China. Most Chinese taxa of Jurassic theropod dinosaurs have not been well described; a further detailed study will be necessary for us to determine their phylogenetic relationships with Shidaisaurus jinae. 相似文献
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Xing Lid Ariana Paulina-Carabajal Philip J. Currie Xu Xing Zhang Jianping Wang Tao Michael E. Burns Dong Zhiming 《《地质学报》英文版》2014,88(6):1653-1664
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. 相似文献
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近年来,福建煤田地质局在龙岩吕凤、永春县含春北矿区上侏罗统岩浆岩下找煤工作取得了新的突破,对缺煤的福建省来说具有重要意义。从聚煤环境和区域构造背景分析来看,岩浆岩盖层分布区属二叠纪聚煤盆地重要成煤区域,且岩浆岩常超覆在晚古生代地层之上。通过分析上侏罗统岩浆岩的岩性特征和物性特征,认为岩浆岩覆盖层与其下伏煤系地层之间明显的物性差异是找煤的主要依据。以吕凤煤矿区、含春北勘查区成功找煤实例为基础．提出了侏罗系长林组和南园组盖层下找煤的六个远景区。 相似文献