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1.
笔者介绍云南宁蒗油果木地区中二叠世含筑蜓地层,地层的岩石学及古生物特征,并就各期沉积环境作一简要分析。对筑蜓类动物群进行详细研究,记述了１３属４８种。依据筑·蜓类的演化,自上而下建立５个筑蜓化石带,分别为：（５）Ｎｅｏｓｃｈｗａｇｅｒｉｎａ延限带;（４）Ｓｃｈｗａｇｅｒｉｎａｐｓｅｕｄｏｃｈｉｈｓｉ－ａｅｎｓｉｓ－Ｓｃｈｗａｇｅｒｉｎａｌｏｎｇｉｐｅｒｔｉｃａ带;（３）Ｎａｎｋｉｎｅｌａｏｒｂｉｃｕｌａｒｉａ－Ｐｉｓｏｌｉｎａｓｕｂｓｐｈａｅｒｉｃａ带;（２）Ｍｉｓ－ｅｌｉｎａｃｌａｕｄｉａｏ带;（１）Ｓｔａｆｆｅｌａｍｏｅｌｅｒａｎａ带,同时讨论筑蜓类动物群的特征,并与国内相关地层进行了对比。 相似文献
2.
北山地区早二叠世“哲斯动物群”特征 总被引：2，自引：0，他引：2
北山地区下二叠统以碎屑岩为主，夹碳酸盐岩及火山岩，属活动型滨海－浅海沉积。在弱水以东的巴丹吉林地区称为埋汗哈达组和阿其德组，由下而上共识别为４个腕足群落：（１）Ｓｐｉｒｉｆｅｒｅｌｌａ－Ｋｏｃｈｉｐｒｏｄｕｃｔｕｓ群落；（２）Ｅｌｉｖａ－Ａｌｅｘａｎｉａ群落；（３）Ｐａｒａｍａｒｇｉｎｉｆｅｒａ－Ｔｒａｎｓｅｎｎａｔｉａ群落；（４）Ｗａａｇｅｎｏｃｏｎｃｈａ－Ｌｉｎｏｐｒｏｄｕｃｔｕｓ群落。在弱水以西的马鬃山地区，划分为双堡塘组和金塔组，原定菊石滩组可能应归并于双堡塘组，仅上述的第１个Ｓ．－Ｋ．群落较发育。据生物对比，本区下二叠统的沉积时代，大致相当于华南的栖霞期至茅口期。上述群落具“哲斯动物群”特征，但与哲斯地区不同的是，本区缺失科而富含菊石。其总貌仍属北极海冷水型动物群。 相似文献
3.
新疆塔里木盆地北部石炭纪孢子带及其地质意义 总被引：2，自引：0，他引：2
塔里木盆地北部石炭纪孢子花粉非常丰富,属种众多,保存完美,经研究共计有７４属,２３１种。根据孢子花粉演化及其在地层中的分布规律,自上而下划分出９个孢子带：９Ｐｒｏｐｒｉｓｐｏｒｉｔｅｓｌａｅｖｉｇａｔｕｓ－Ｇｒｕｍｏｓｉｓｐｏｒｉｔｅｓｖａｒｉｏｒｅｔｉｃｕｌａｔｕｓ（ＬＶ）带８Ｂｅｌｉｓｐｏｒｉｔｅｓｎｉｔｉｄｕｓ－Ｍｕｒｏｓｐｏｒａｃａｎｄｉｐｌｉｃａｔａ（ＮＣ）带７Ｒａｉｓｔｒｉｃｋｉａｎｉｇｒａ－Ｓｃｈｕｌｚｏｓｐｏｒａｃａｍｐｙｌｏｐｔｅｒａ（ＮＣ）带６Ｌｙｃｏｓｐｏｒａｐｕｓｉｌａ（ＰＵ）带５Ｓｃｈｏｐｆｉｔｅｓｃｌａｖｉｇｅｒ－Ａｕｒｏｒａｓｐｏｒａｍａｃｒａ（ＣＭ）带４Ｓｐｅｌａｅｏｔｒｉｌｅｔｅｓｐｒｅｔｉｏｓｕｓ－Ｒａｉｓｔｒｉｃｋｉａｃｌａｖａｔａ（ＰＣ）带３Ｓｐｅｌａｅｏｔｒｉｌｅｔｅｓｂａｌｔｅａｔｕｓ－Ｒｕｇｏｓｐｏｒａｐｏｌｙｐｔｙｃｈａ（ＢＰ）带２Ｋｒａｅｕｓｅｌｉｓｐｏｒｉｔｅｓｈｉｂｅｒｎｉｃｕｓ－Ｕｍｂｏｎａｔｉｓｐｏｒｉｔｅｓｄｉｓｔｉｎｃｔｕｓ（ＨＤ）带１Ｖａｌａｔｉｓｐｏｒｉｔｅｓｖｅｒｕｃｏｓｕｓ－Ｒｅｔｕｓｏｔｒｉｌｅｔｅｓｉｎｃｏｈａｔｕｓ? 相似文献
4.
对泥河湾动物群(狭义)与欧洲维拉方经典动物群中属级相同的２０种哺乳动物进行形态和进化水平上的对比发现,其中有１１种(包括亚种)和晚维拉方期的 Ｏｌｉｖｏｌａ动物群的成员最接近,有４种可与中维拉方晚期的Ｓｅｎｅｚｅ动物群的成员比较,其中有２种因为仅发现于Ｓｅｎｅｚｅ,不足以说明它们一定只和泥河湾者接近。另外两种(Ｌｙｎｘ ｓｈａｎｓｉｕｓ和Ｐｓｅｕｄｏｄａｍａｅｌｅｇａｎｓ)确实和Ｓｅｎｅｚｅ者更接近而不同于Ｏｌｉｖｏｌａａ者。有两种动物(Ｂｏｒｓｏｄｉａ ｃｈｉｎｅｎｓｉｓ和Ｍｅｌｅｓ ｃｈｉａｉ)间接地表明泥河湾动物群可能和 Ｏｌｉｖｏｌａ更接近。还有 ３种时代意义不大。总之,对比表明泥河湾动物群(狭义)与欧洲晚维拉方早期的Ｏｌｉｖｏｌａ动物群最为接近,其年代应为１８Ｍａ左右,接近于海相Ｖｒｉｃａ剖面更新世／上新世界线(１．７９６Ｍａ)。 相似文献
5.
本区太原组类化石经鉴定有８属３９种，其中球希瓦格在本区西部Ｌ１灰岩中大量出现。按照在太原组中的分布情况，球希瓦格带由下而上可划分为两个亚带即：１．Ｓｐｈａｅｒｏｓｃｈｗａｇｅｒｉｎａ－Ｑｕａｓｉｆｕｓｕｌｉｎａ亚带（Ｌ１－Ｌ５灰岩）；２．Ｓｃｈｗａｇｅｒｉｎａ－Ｅｏｐａｒａｆｕｓｕｌｉｎａ亚带（Ｌ６－Ｌ８灰岩）。本区石炭－二叠系的界线，根据动物群的资料，应划在Ｌ１灰岩之底界面，太原组划归早二叠世。 相似文献
6.
四川省若尔盖县巴西—求吉地区晚三叠世遗迹化石及遗迹相 总被引：4，自引：0，他引：4
四川若尔盖巴西－求吉地区晚三叠世首次发现了丰富的遗迹化石，经鉴定有２２个遗迹属、３４个遗迹种。根据不同遗迹属在不同层位中的相对丰度，建立了４个遗迹组合：（１）Ｈｅｌｍｉｎｔｈｏｐｓｉｓ－Ｐｈｙｃｏｓｐｈｏｎ组合；（２）Ｄｅｎｄｒｏｔｉｃｈｎｉｕｍ－Ｎｅｏｎｅｒｅｉｔｅｓ组合；（３）Ｐａｌｅｏｄｉｃｔｙｏｎ组合；（４）Ｔａｅｎｉｄｉｕｍ－Ｃｏｓｍｏｒｈａｐｈｅ组合。上述遗迹组合大致相当于Ｓｅｉｌａｃ 相似文献
7.
在详细研究全球二叠－三叠系界线层候选剖面───中国浙江长兴煤山剖面Ｐ／Ｔ界线层牙形石动物群序列基础上，自下而上识别出４个牙形石带：（１）ＣｌａｒｋｉｎａｃｈａｎｇｘｉｎｇｅｎｓｉｓＣｌａｒｋｉｎａｄｅｆｌｅｃｔａ带；（２）Ｉｓａｒｃｉｃｅｌｌａｐａｒｖａ带；（３）Ｉｓａｒｃｉｃｅｌｌａｉｓａｒｃｉｃａ带；（４）ＣｌａｒｋｉｎａｃａｒｉｎａｔａＣｌａｒｋｉｎａｐｌａｎａｔａ带，并在第一带中划分出３个动物群，从下向上是：ＣｌａｒｋｉｎａｃｈａｎｇｚｉｎｇｅｎｓｉｓＣｌａｒｋｉｎａｄｅｆｌｅｃｔａ－Ｃｌａｒｋｉｎａｓｕｂｃａｒｉｎａｔａ动物群，Ｈｉｎｄｅｏｄｕｓｌａｔｉｄｅｎｔａｔｕｓ－Ｃｌａｒｋｉｎａｍｅｉｓｈａｎｅｎｓｉｓｓｐ．ｎｏｖ．动物群和Ｈｉｎｄｅｏｄｕｓｔｙｐｉｃａｌｉｓ动物群，煤山剖面二叠、三叠系界线层牙形石序列的建立、完善，对确立该剖面在全球二叠、三在系界线高精度对比中的标准地位具重要意义。 相似文献
8.
青海油砂山油田第68层分流河道砂体解剖学 总被引：15，自引：0，他引：15
青海油砂山剖面第６８层三角洲分流河道砂体内部可识别出来Ｇｐｒ、Ｇｌｔ、Ｇｅ、Ｓｌｔ、Ｓｍｔ、Ｓｐｒ、Ｓｌａ、Ｓｂｍ、ＳＩｃｒ、ＳＩｈ和Ｍｒｉ等１２种岩石相，它们构成了６种岩石相组合，即:Ｇｅ－Ｇｐｒ－Ｇｌｔ组合，Ｇｌｔ－Ｓｌｔ组合，Ｓｌｔ－Ｓｍｔ组合，Ｇｌｔ－Ｓｂｍ组合，Ｓｓｔ－Ｍｒｌ组合，Ｇｐｒ（Ｓｐｒ）－Ｍｒｌ－Ｓｓｔ－Ｍｒｌ－ＳＩｃｒ－Ｍｒｌ组合。按照沉积界面之间的切割关系，建立一个包括７级界面的界面层次，第一级为砂体的上下边界，第七级为纹层边界，沉积界面将砂体分隔为三个沉积幕，它们由六个沉积亚幕组成。砂体建筑结构要素包括侧积体（ＬＡ），纵向砂坝（ＬＢ），横向砂坝（ＴＢ），简单砾质充填（ＧＦ），简单砂质充填（ＳＦ）和堤岸砂坪（ＬＦ）等六种类型，它们具有不同的宽度和厚度比。通过露头密网格采样和沉积学分析建立了砂体渗透率原型模型，均质模型，幕式模型以及建筑结构要素模型，其中建筑结构模型与原型模型相似性最好，证明了利用建筑结构分析可以建立符合砂体客观实际的储层地质模型。 相似文献
9.
滇西亲冈瓦纳微古植物的发现及其地质意义 总被引：7，自引：1，他引：6
本文首次报道滇西保山丁家寨组孢子花粉４０属５５种,其中新种Ｐｌｉｃａｔｉｐｏｌｅｎｉｔｅｓｂａｏｓｈａｎｅｎｓｉｓ１个。丁家寨组的孢子花粉组合是一个以冈瓦纳植物地理区分子为主,兼有少量华夏植物地理区和其它植物地理区分子。丁家寨组的Ｐａｒａｓａｃｉｔｅｓｄｉｓｔｉｎｃｔｕｓ－Ｍｉｃｒｏｂａｃｕｌｉｓｐｏｒａｆｅｎｔｕｌａ（ＤＦ）孢子带可与冈瓦纳植物地理区Ｐａｒａｓａｃｉｔｅｓ孢子带比较,时代为阿舍尔阶（Ａｓｅｌｉａｎ）萨克马尔阶（Ｓａｋｍａｒｉａｎ）。丁家寨组的微古植物研究不仅有重要的地层学和古生物学意义,而且对研究冈瓦纳大陆与欧亚大陆之间的关系有着十分重要的意义。 相似文献
10.
鄂尔多斯盆地西缘中宁、乌达地区石炭纪海相双壳类 总被引：2，自引：0，他引：2
本文报道的海相双壳类化石采自鄂尔多斯盆地西缘石炭纪海陆交互相含煤地层．经研究，双壳类有１３属，２７种，其中某些属种为我国首次发现，并建立了３个新种：Ｓａｎｇｕｉｎｏｌｉｔｅｓｎｉｎｇｘｉａｅｎｓｉｓ，Ｌｅｐｔｏｄｅｓｍａｓｈｉｋｏｎｇｅｎｓｉｓ和Ｓｔｒｅｂｌｏｃｈｏｎｄｒｉａｄａｓｈｉｔｏｕｊｉｎｇｏｕｅｎｓｉｓ本文采取将石炭系二分方案．研究区上石炭统下部（靖远组和羊虎沟组）海相双壳类特别丰富，有１０属２１种．这一双壳类组合与西欧和北美同期（纳缪尔一维斯发期；宾夕法尼亚的早期）的双壳类面貌相似，与国内山西太原同期的动物群差别很大，而与甘肃靖远和河南固始等地的动物群关系密切，这对恢复当时的古地理有重要意义． 相似文献
11.
过去认为涝池河—阳郭动物群的时代相当或稍晚于泥河湾动物群,早于公王岭动物群,厚镇涝池河动物群的时代与公王岭动物群的一致。但各动物群的层位及在动物群演化上所处的位置表明涝池河—阳郭动物群的时代应与公王岭动物群的一致,比泥河湾动物群的晚,而厚镇涝池河动物群的时代应与陈家窝动物群的相当。重新厘定了公王岭期与陈家窝期的涵义,认为蓝田黄土地层中、早更新统的界线应划在Ｓ８与Ｌ９交界处。 相似文献
12.
Late Olenekian assemblages in the western Panthalassa have been recovered from bedded radiolarian chert sequences of an accretionary complex, the Ashio belt. These faunas are documented and considered in terms of radiolarian diversity and faunal turnover during the latest Permian to Middle Triassic time. The fauna includes 30 radiolarians belonging to Spumellaria or Entactinaria, with two relicts from the Late Permian. This late Olenekian fauna is markedly different from Permian and Asisian faunas, respectively, and is herein named the Minowa fauna. Study of the literaure indicates that radiolarian provinces were significantly disconnected between the western Panthalassa and eastern Tethys during late Olenekian time. Furthermore, 121 of 143 species disappeared during late Olenekian time, and in turn 118 new species appeared in the western Panthalassa around the Olenekian-Anisian boundary. It is concluded that faunal turnover occurred at least three times between the latest Permian and Middle Triassic.The first turnover is the Poalaozoie-type radiolarian extinction at the Permain-Triassic boundary,the second is the diversification of spheroidal Spumellaria and Entactinaria between early and late Olenekian time, and the third is a faunal turnover from the Minowa fauna to the true Mesozoic-type radiolarian famas that are characterized by mulit0segmented Nassellaria. 相似文献
13.
J. Chazeau Dr. 《GeoJournal》1983,7(6):527-532
This paper is an attempt to sum up our knowledge of the coccinellid fauna in the Pacific area. About 560 species have been recorded from the area, in which Australia has been included because it is essential for a proper understanding of the Melanesian insular faunas. Major points emerging from this study are: a significant reduction in the number of species from west to east; the prevalence of Oriental and Australian influences over American influences; the difficulty of determining faunal characteristics for most sub-regional units; the great difference between the New Guinean and Australian faunas, the former, though not well investigated as yet, displaying a much stronger Oriental influence and a wide variety of endemic forms; recent artificial dispersal by man for purposes of biological control, which many sometimes completely mask the original fauna. It must be admitted that a great deal of taxonomic work remains to be done before we can claim to have cocomprehensive biogeographic synthesis of this family in the Pacific. 相似文献
14.
A thin phosphate-granule conglomerate within the Upper Cretaceous (middle Campanian) Rattlesnake Mountain sandstone member of the Aguja Formation preserves a diverse chondrichthyan and osteichthyan fauna. This highly fossiliferous deposit (the ‘Ten Bits Microsite’) yielded about 5000 teeth, spines, and denticles in a small amount of matrix (c. 150 kg). About 30 identifiable species of sharks, rays, and bony fishes are recognized. Two of the three most abundant chondrichthyan species at Ten Bits (Scapanorhynchus texanus and Ischyrhiza mira) are also the most common species in other middle to late Campanian marine vertebrate faunas along the Gulf and Atlantic Coastal Plain. The myliobatiform rays Brachyrhizodus and Rhombodus that occur at Ten Bits also appear to be characteristic of the Gulf and Atlantic Coast, as are lamniform sharks such as Cretalamna and Serratolamna. These taxa are entirely absent or extremely rare in Western Interior Campanian faunas. In contrast, some small orectolobiform sharks (Cantioscyllium, Chiloscyllium, Columbusia) and small rays (Protoplatyrhina) found at Ten Bits are common in shallow water faunas of the Western Interior and Texas Coastal Plain, but rarely reported from the eastern Gulf or Atlantic Coast. The common Western Interior ray Myledaphus bipartitus does not occur at Ten Bits or in any Gulf or Atlantic Coast fauna. Ptychotrygon agujaensis is abundantly represented in the Ten Bits fauna, but unknown in correlative marine faunas. Although Ptychotrygon occurs in all Western Interior, Gulf and Atlantic Coastal Plain faunas, it is represented elsewhere by apparently endemic species at each collection site. The differences between Western Interior, Gulf, and Atlantic Coastal Plain faunas probably reflect latitudinal variation in water temperature or salinity, or different oceanic water circulation patterns between the Western Interior Seaway and the Gulf or Atlantic Coast that restricted the distributions of some marine fish species. The Ten Bits fauna shares typical species with both Western Interior and Gulf and Atlantic Coast faunas, reflecting its position at the border between these provinces; however, the dominant taxa found at Ten Bits are the same as those found on the Gulf and Atlantic Coast, and indicate that western Texas was more closely allied biogeographically with that province than with the Western Interior of North America. One species tentatively identified in the Ten Bits fauna on the basis of a single tooth, Igdabatis cf. I. indicus, is otherwise known only from southern Europe and Asia, although a similar large myliobatid ray also occurs rarely in Texas Coastal Plain faunas. These occurrences indicate that western Texas may have been near the northern limit of the range for some tropical Tethyan marine vertebrate species. 相似文献
15.
Data from the mammal fauna of the North Urals during the Late Pleistocene and Holocene are synthesised. Analysis of differentiation the degree of small- and large-mammal faunas during this time has been undertaken. Only differences of mammal species composition were significant between the Late Pleistocene and Holocene complexes, and within these complexes, the distinction between faunas was insignificant. The transition from the Late Pleistocene to the Holocene complex small-mammal faunas occurred in the Middle Late Valdai due to expansion of the forest species. In large-mammal faunas, the process was recorded later (in Dryas 3-Early Holocene) because of the extinction of some species and others that changed their areas of occupation. 相似文献
16.
冈瓦纳与欧亚大陆间的昌都地块构造属性存在争议,解决问题的关键是生物古地理区系判别.青海南部二叠纪类化
石群的研究表明昌都地块该生物群一直表现为暖水的特提斯型,与华南地区始终表现出更多的相似性,其生物古地理归属应
为特提斯大区华夏-特提斯区华南亚区.昌都地块南界龙木错-双湖-澜沧江缝合带在早二叠世为划分青藏高原暖水型特提
斯区的南界,不仅是华南亚区与藏北冷暖混合亚区的分界线,也是特提斯大区与冈瓦纳大区的分界线.中二叠世以后该带不再
构成大区界线,但在确定次一级分区界线上仍是一个很好的划分标志;北界金沙江缝合带二叠纪两侧生物群表现出一致性,
未形成浅海底栖生物自由迁移的障碍,不具有生物古地理分区意义. 相似文献
17.
Dmitry Ponomarev Andrey Puzachenko Olga Bachura Pavel Kosintsev Johannes van der Plicht 《Boreas: An International Journal of Quaternary Research》2013,42(3):779-797
The paper summarises materials on the mammal remains in northeastern Europe, dated by radiocarbon. Altogether, 23 local faunas of small mammals and 47 local faunas of large mammals were analysed. Multidimensional statistical analysis shows a strong correlation between changes in small mammal fauna composition and climate changes throughout time. The correlations with the spatial gradients, however, are less pronounced. The faunas are classified into three groups: (1) faunas of Holocene age; (2) Late Pleistocene ‘stadial’ assemblages; and (3) Late Pleistocene ‘interstadial’ assemblages. In some cases, changes in species abundance are better understood in terms of biotic interrelations rather than of climatic effects. The most pronounced change in small mammal fauna composition and structure occurred at the Preboreal/Boreal boundary, and a less conspicuous alteration took place at the LGM/Lateglacial transition. The most noticeable transformation in the large mammal fauna composition is dated to the early Holocene. Less significant changes are observed at the Middle Weichselian/LGM transition and at the LGM/Lateglacial transition. It is safely concluded that variations in the faunas of small and large mammals recorded in NE Europe during the last 35 000 years occurred synchronously and unidirectionally. 相似文献
18.
本文针对我国第四纪内陆有孔虫化石群的出现及其存在问题,提出有没有非海相有孔虫以及第四纪内陆有孔虫化石群是否都与海水入侵有关等问题。作者从我国现代海岸带有孔虫群调查着手,结合国外资料,说明弱海相性有孔虫群的分布及特征,分析我国第四纪内陆有孔虫化石群的生态环境,指出弱海相性有孔虫群具有一定的指相意义,是一类非正常的海相有孔虫群,不仅存在于海岸带,也可出现在内陆环境,出现有孔虫群不一定证明有海水入侵,只要有适宜的水化学条件也可出现。推论第四纪内陆有孔虫群有的与海水有关,有的可能无关。 相似文献
19.
最近在广西崇左三合大洞发现了步氏巨猿和似人似猿共生的新层位,与之伴生的有52种小哺乳动物,占三合大洞巨猿动物群总数的62%,其中苏门答腊兔（Nesolagus）是东南亚地区首次发现的化石。小哺乳动物群以南方早更新世常见的偏皮氏毛耳飞鼠（Belomys parapearsoni）、中间猪尾鼠（Typhlomys intermedius）、拟低冠竹鼠（Rhizomys brachyrhizomyoides）、硕豪猪（Hystrix magna）、先社鼠（Niviventer preconfucianus）、拟爱氏巨鼠（Leopoldamysedwardioidesi）等为代表,根据小哺乳动物群性质和与其他动物群对比以及磁性地层年代测定,表明其时代应是早更新世中期（约距今120160万年前）。该动物群由树鼩、扁颅蝠、小彩蝠、飞松鼠、笔尾树鼠、猪尾鼠等几乎是旧大陆热带-亚热带森林型动物组成,缺少北方类型,基本上属于热带森林动物群,这表明了当时的自然景观为温暖湿润的热带雨林环境。三合大洞小哺乳动物群是广西地区的首次发现,对华南早更新世巨猿动物群详细划分,探讨步氏巨猿演化和早期人类环境背景等目前科学界关注的问题具有重要的意义。 相似文献
20.
中国北方晚更新世哺乳类动物群的划分及其地理分布 总被引：3，自引：0，他引：3
<正> 新第三纪以来,由于青藏高原、喜马拉雅山脉与西部山脉的隆起,我国形成了西高东低的地形特点,导致了气候和环境的变迁,明显地影响了中国哺乳动物的分布。在晚更新世,中国南北动物群分化逐渐扩大,动物群更替尤为频繁。中国晚更新世地层及动物群的研究已有一段相当长的历史,发现了众多重要的遗址和化石地点,积累了丰富的资料。笔者综合有关资料,对我国北方晚更新世动物群,特别是猛犸象-披毛犀动物群的划分、地 相似文献