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The Expanding Earth: Indisputable Evidences of the Gobi Desert 预览
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作者 Alexey Ju. Retejum 《地质学期刊(英文)》 2020年第1期1-12,共12页
The most striking contrasts that are found on the continents in paleogeographic reconstructions of the end of the Mesozoic era are the occurrence on the place of the disappeared humid subtropics of the largest Gobi De... The most striking contrasts that are found on the continents in paleogeographic reconstructions of the end of the Mesozoic era are the occurrence on the place of the disappeared humid subtropics of the largest Gobi Desert in Eurasia with air temperatures falling below 50&#176;from the freezing point and annual precipitation totals at the level of 100 mm. Science does not know the processes that can lead to a cooling of the atmosphere at 70&#176;and other equally radical changes in nature with a stable position of the blocks of the earth’s crust in space. Changes in the environment of this magnitude can only be the result of land moving northward for a distance equal to about half the radius of the Earth. Titanosaurs, described by the remains in the Gobi deposits, had a body volume, which at modern gravity corresponds to a mass of 10 to 30 ton. However, animals with such a mass and such growth could not exist now. To create the necessary pressure in the vessels and provide energy to the body, Mongolian sauropods would need a heart of 2 - 3 m in diameter. Known types of muscle tissue are unable to maintain an elongated neck and head with a mass of more than a ton. The femur bones of four-legged dinosaurs had strength sufficient to move on land only animals weighing no more than 5 - 7 tons. The bones of giant bipedal dinosaurs at a constant gravitational field would have to be subjected to specific loads, several times greater than the bones of modern elephants, which is excluded. The natural conclusion about the action of a lesser gravity in the Mesozoic provides a solution to the mystery of the truly global spread in that era of bipedal mode of movement as the most energy efficient. 展开更多
关键词 EXPANDING EARTH GOBY DESERT CRETACEOUS FOSSILS Giant Dinosaurs Gravity Atmospheric Circulation
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Origin of Angiosperms and Their Diversification in the Cretaceous 预览
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作者 Xin Wang 《地质学期刊(英文)》 2019年第10期577-580,共4页
The dominating hypothesis stated that angiosperms originated in the Early Cretaceous, there were no pre-Cretaceous angiosperms, and carpels (the basic units of gynoecium) were derived from former megasporophylls beari... The dominating hypothesis stated that angiosperms originated in the Early Cretaceous, there were no pre-Cretaceous angiosperms, and carpels (the basic units of gynoecium) were derived from former megasporophylls bearing ovules/seeds along their margins through longitudinally folding and enrolling. However, there are increasing evidences of pre-Cretaceous angiosperms, the assumed megasporophyll actually does not exist, and the Cretaceous-only history of angiosperms appears much shorter than suggested by molecular clocks. Here I will integrate new knowledge of living and fossil plants to give a plausible explanation for the origin and early evolution of angiosperms. Several lines of evidence indicate that the ancestor of angiosperms may well have been present in the Triassic. The former gap between angiosperms and gymnosperms is artificial. Some Triassic fossils playing a role intermediate between angiosperms and gymnosperms seem to favor the Unifying Theory. 展开更多
关键词 Jurassic TRIASSIC ANGIOSPERMS ORIGIN Evolution FOSSILS UNIFYING Theory
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Fossil Trove Paleobiologists find extraordinarily preserved fossils that will help understand the Cambrian Explosion
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作者 Wang Hairong 《北京周报:英文版》 2019年第24期30-31,共2页
In a valley near Changyang County of central China’s Hubei Province,a small creek named Danshui River converges with the Qingjiang River at Jinyangkou Town.Innumerous pieces of layered gray claystone are strewn over ... In a valley near Changyang County of central China’s Hubei Province,a small creek named Danshui River converges with the Qingjiang River at Jinyangkou Town.Innumerous pieces of layered gray claystone are strewn over the Danshui’s bed and banks at its junction with the Qingjiang. 展开更多
关键词 CAMBRIAN Explosion FOSSILS central China’s Hubei Province
The environmental implication of diatom fossils in the surface sediment of the Changjiang River estuary (CRE) and its adjacent area 预览
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作者 FAN Xin CHENG Fangjin +1 位作者 YU Zhiming SONG Xiuxian 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2019年第2期552-567,共16页
In order to depict the distribution of diatom fossils in surface sediments and to establish a reliable reference data for further paleoenvironmental study in the Changjiang (Yangtze) River estuary and its adjacent wat... In order to depict the distribution of diatom fossils in surface sediments and to establish a reliable reference data for further paleoenvironmental study in the Changjiang (Yangtze) River estuary and its adjacent waters, the diatom fossils from 34 surface sediment samples and their relationship with environmental variables were analyzed by principal component analysis and redundancy correspondence analysis. The diversity and abundance of diatom fossils were analyzed. Some annual average parameters of the overlying water (salinity, temperature, turbidity, dissolved oxygen, depth, dissolved inorganic nitrogen, dissolved inorganic phosphate and dissolved inorganic silicate) were measured at each sampling site. A total of 113 diatom taxa and one silicoflagellate species were identified in the investigation area. Diatom fossils were better preserved in fine sediments. The absolute abundance of diatom fossils did not significantly diff er between inshore and off shore areas, the species diversity decreased from inshore to off shore. This may be because high nutrients and low salinity promoted the growth of more brackish species in coastal waters. The diatom taxa were divided into three groups, on the basis of their response and indication to environmental changes. For example, Actinocyclus ehrenbergii and Cyclotella stylorum were dominant in coastal waters (Group 1 and Group 3) with high nutrients and low salinity;the relative abundances of Paralia sulcata and Podosira stelliger were significantly higher in off shore sites (Group 2, average 39.5%), which were characterized by high salinity and deep water. Four environmental variables (salinity, dissolved inorganic nitrogen, temperature and water depth) explained the composition and distribution of diatom taxa independently ( P< 0.05), this finding can be applied in further paleoenvironmental reconstruction research in this area. 展开更多
关键词 DIATOM FOSSILS CHANGJIANG River ESTUARY surface sediments environmental VARIABLES
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A Treasure Trove of Fossils 预览
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《今日中国:英文版》 2019年第4期74-77,共4页
MAOTIAN is a cap-shaped mountain 52 km southeast of Kunming, the capital of Yunnan Province. It came to public attention in the 1980s after a big trove of fossils dating back 530 million years was discovered there. Th... MAOTIAN is a cap-shaped mountain 52 km southeast of Kunming, the capital of Yunnan Province. It came to public attention in the 1980s after a big trove of fossils dating back 530 million years was discovered there. This was called one of the biggest scientific discoveries of the 20th century. As Maotian is located in Chengjiang County, the fossil site is named after the county. 展开更多
关键词 TREASURE Trove FOSSILS MAOTIAN Chengjiang COUNTY
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Automated Image Analysis of Mud and Mudrock Microstructure and Characteristics of Hemipelagic Sediments: IODP Expedition 339
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作者 Shereef A.Bankole Jim Buckman +1 位作者 Dorrik Stow Helen Lever 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第2期407-421,共15页
The microstructural analysis of muds and mudrocks requires very high-resolution measurement. Recent advances in electron microscopy have contributed significantly to the improved characterisation of mudrock microstruc... The microstructural analysis of muds and mudrocks requires very high-resolution measurement. Recent advances in electron microscopy have contributed significantly to the improved characterisation of mudrock microstructures and their consequent petrophysical properties. However, imaging through electron microscopy is limited to small areas of coverage such that upscaling of these properties is a great challenge. In this paper, we develop a new methodology for multiple large-area imaging using scanning electron microscopy through automated acquisition and stitching from polished thin-sections and ion-milled samples. The process is fast, efficient and minimises user-input and bias. It can provide reliable, quantifiable data on sediment grain size, grain orientation, pore size and porosity. Limitations include the time involved for individual runs and manual segmentation, the large amount of computer memory required, and instrument resolution at the nano-scale. This method is applied to selected samples of Quaternary muddy sediments from the Iberian margin at IODP Site 1385. The section comprises finegrained(very fine clayey silts), mixed-composition, biogenic-terrigenous hemipelagites, with a pronounced but non-regular colour cyclicity. There is a multi-tiered and diverse trace fossil assemblage of the deep-water Zoophycos ichnofacies. The sediment microstructures show small-scale heterogeneity in all properties, and an overall random fabric with secondary preferred grain-alignment. These results on the fabric differ, in part, from previous studies of hemipelagic muds. Further work is underway on their comparison with other deep-water sediment facies. 展开更多
关键词 MUDROCKS MICROSTRUCTURE MICROPOROSITY grain-orientation hemipelagites trace FOSSILS
古生物CT装置的研制及应用 预览
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作者 王燕芳 魏存峰 +7 位作者 阙介民 张文定 孙翠丽 舒岩峰 侯叶茂 张久昶 史戎坚 魏龙 《古脊椎动物学报》 CSCD 北大核心 2019年第1期84-92,共9页
古生物化石研究传统的磨片法耗时,且具有破坏性,研究者不可能对珍贵的化石标本进行这样的操作,因此研究只能停留在化石的外表面。而古生物CT装置的出现使研究者可以对化石内部结构进行无损检测,得到上千层化石的图像数据。主要论述国内... 古生物化石研究传统的磨片法耗时,且具有破坏性,研究者不可能对珍贵的化石标本进行这样的操作,因此研究只能停留在化石的外表面。而古生物CT装置的出现使研究者可以对化石内部结构进行无损检测,得到上千层化石的图像数据。主要论述国内首套古生物CT装置的研制及典型应用,其中225-3D-μCT显微CT系统具有三维成像能力,最高分辨率达5μm,可以检测直径100mm,高度100mm尺度的化石;450-TY-ICT通用型CT可对大尺寸化石高信噪比成像,检测范围是直径800mm,高度1000mm,分辨率达200μm。这两台古生物CT以高成像性能满足了研究者对不同尺度化石的不同检测需求,成为中国古生物化石研究中非常重要的技术手段。 展开更多
关键词 化石 工业CT 古生物学
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Fossils Reveal Flowers Originated 50 Million Years Earlier than Thought
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《中国科学院院刊:英文版》 2018年第4期256-257,共2页
The discovery in China of fossil specimens of a flower called Nanjinganthus from the Early Jurassic suggests that flowers originated 50 million years earlier than previously thought.Scientists have discovered the earl... The discovery in China of fossil specimens of a flower called Nanjinganthus from the Early Jurassic suggests that flowers originated 50 million years earlier than previously thought.Scientists have discovered the earliest flower specimens dating back to the Early Jurassic。 展开更多
关键词 FOSSILS REVEAL FLOWERS 50 MILLION Years EARLIER THOUGHT
Trace fossils of an amalgamated storm-bed succession from the Jurassic of the Kachchh Basin,India:The significance of time-averaging in ichnology
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作者 Franz To Fürsich Alfred Uchman +1 位作者 Matthias Alberti Dhirendra K.Pandey 《古地理学报:英文版》 CSCD 2018年第1期14-31,共18页
The uppermost part of the Upper Bathonian Sponge Limestone member, Patcham Formation, of the Jhura Dome of Kachchh Mainland is a thickening-and shallowing-upward succession topped by medium-to thick-bedded hummocky cr... The uppermost part of the Upper Bathonian Sponge Limestone member, Patcham Formation, of the Jhura Dome of Kachchh Mainland is a thickening-and shallowing-upward succession topped by medium-to thick-bedded hummocky cross-stratified grainstones deposited by storm waves. Occasionally, thin, commonly lenticular, intraclastic-bioclastic silty marl intercalations between the grainstones are highly bioturbated, in contrast to the grainstones, in which, for the most part, trace fossils occur scattered. Large exposures of bedding planes of the grainstones allow the detailed investigation of ichnological features, whereas the high density of traces in the soft marls precludes the identification of any ichnotaxa. Eighteen ichnotaxa have been recorded including Ophiomorpha, Thalassinoides, Taenidium, Gyrophyllites, Chondrites, Dactyloidites, Teichichnus, Bolonia, and Ancorichnus. Except for Ophiomorpha nodosa and Thalassinoides, which generally indicate moderate to high energy conditions and are the dwelling burrows of suspension-feeding to omnivorous crustaceans, the ichnotaxa represent a deposit-feeding behaviour of their producers and thus are characteristic of low-energy environments. The trace fossils form three ichnoassemblages characterized by(1) Ophiomorpha nodosa and Thalassinoides suevicus,(2)?Thalassinoides isp. A, Taenidium, and Bolonia lata,and(3) Ancorichnus. The dominance of traces of deposit-feeders in rocks indicative of high-energy events is counterintuitive and points to their non-contemporaneity. The sediments were deposited during brief highenergy events, whereas the trace fossils were produced when, after waning of storms low-energy conditions prevailed. This time-averaging is particularly pronounced in trace fossils that extend vertically downwards and may reach strata deposited under distinctly different conditions. Thus, environmental interpretations based on trace fossils should refer to colonisation surfaces rather than to the sediment surrounding the trace fossils. In the latter case, interpretat 展开更多
关键词 Trace FOSSILS Middle JURASSIC KACHCHH Basin Taxonomy TIME AVERAGING ICHNOLOGY
三维X射线显微技术与小型-微体化石高分辨率无损成像
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作者 吴素萍 殷宗军 +2 位作者 孙玮辰 赵多多 吴若琳 《古生物学报》 CSCD 北大核心 2018年第2期157-167,共11页
在古生物学研究中,以X射线断层成像(Computed Tomography)为代表的三维无损成像技术可以在不破坏化石标本的前提下,同时获得标本外观形态和内部结构的信息,相比传统的可见光成像手段有着明显优势。为推动化石三维无损成像技术在国内... 在古生物学研究中,以X射线断层成像(Computed Tomography)为代表的三维无损成像技术可以在不破坏化石标本的前提下,同时获得标本外观形态和内部结构的信息,相比传统的可见光成像手段有着明显优势。为推动化石三维无损成像技术在国内古生物学领域的发展,本文系统介绍一种新型显微CT技术——三维X射线显微术(Three-Dimensional X-ray Microscopy)。与基于几何放大和吸收衬度成像的传统显微CT技术相比,该技术有若干优势:(1)将同步辐射X射线显微断层成像的光学成像系统引入基于实验室X射线源的显微CT系统中,在几何放大的基础上增加了光学放大,优化了传统显微CT的系统架构,弥补了传统显微CT单纯依靠几何放大的不足,提高了空间分辨率;(2)采用可移动的X射线源和优化的光学成像系统,实现了低能X射线相位衬度成像,可以三维重构传统显微CT技术无法有效探测的、低吸收衬度的化石标本;(3)基于新的成像架构和成像算法,实现了厘米-分米级较大标本内部“感兴趣区域”(Region of Interest)精确导航和局部高分辨率(微米-亚微米空间分辨)成像;(4)可以实现小型扁平标本(宽厚比〉4,宽〈10cm)高效率、高分辨率成像和长条形微体标本长轴方向自动分段无缝拼接的微米至亚微米级高分辨率重建,弥补了传统工业显微CT针对小型扁平标本和长条形微体标本高分辨成像效果不佳的缺陷。这些优势使得基于实验室X射线源的显微CT成像技术可以获得接近同步辐射X射线源的成像质量,从而有效推动化石生物学研究。 展开更多
关键词 三维X射线显微术 无损成像 三维重建 工业显微CT 化石
Magnetochronology of Late Miocene Mammal Fauna in Xining Basin,NE Tibetan Plateau, China 预览
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作者 HAN Jian'en SHAO Zhaogang +7 位作者 CHEN Qiguang XU Biao ZHANG Qianqian YU Jia MENG Qingwei ZHANG Xuefeng WANG Jin ZHU Dagang 《地质学报:英文版》 SCIE CAS CSCD 2018年第6期2067-2078,共12页
The Xining basin is located in the northeastern margin of the Qinghai-Tibet Plateau.It is a rift basin formed in Mesozoic and Cenozoic and structurally belongs to the intersection of Kunlun and Qilian Mountains.Cenozo... The Xining basin is located in the northeastern margin of the Qinghai-Tibet Plateau.It is a rift basin formed in Mesozoic and Cenozoic and structurally belongs to the intersection of Kunlun and Qilian Mountains.Cenozoic fluvial and lacustrine sedimentary strata are continuous in the Xining basin,with a thickness of more than 800 m,completely recording the deformation uplifting,weathering and denudation history and climate change process of the northeastern plateau.Currently,early Miocene Xijia fauna,early Middle Miocene Danshuilu fauna and late Middle Miocene Diaogou fauna are discovered in the Xining basin,which provide an important basis for the stratigraphic correlation of the Cenozoic strata in the Xining basin.However,in the next few decades,there are no reports about the large mammal fossils in the Xining basin,especially about late Miocene fauna.The author discovered a large amount of mammal fossils in the Neogene sedimentary strata in Huzhu area,Xining basin.According to the identification results of the Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,these fossils mainly included Hipparion dongxiangense,Chilotherium sp.,Parelasmotherium sp.,Stephanocemas sp.and Kubanochoerus sp.and their age was early Late Miocene.Since the discovery of this set of fossils directly filled the blank that there were no large mammal fossils in the Xining basin in Late Miocene,it was very important for studying the magnetic stratigraphic chronology of fossil-forming strata and establishing the paleomagnetic chronology scale plate of mammal fossils.In this paper,the paleomagnetic data of the fossil-forming stratigraphic profile,Banyan profile,were measured and the paleomagnetic records were collected through high density sampling,and finally the paleomagnetic polarity column of the profile was established.The results showed that five positive and five negative polarity segments were recorded in Banyan profile,which corresponded well to the polarity between C3Br.1n-C4n.2n in the standard 展开更多
关键词 MAMMAL FOSSILS magnetic STRATIGRAPHY late MIOCENE Xining basin Qinghai-Tibet Plateau
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化石类世界遗产的基本特征及贵州三叠纪化石群申遗策略 预览
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作者 吴宇辉 肖时珍 +1 位作者 狄永宁 肖华 《遗产与保护研究》 2018年第4期1-5,共5页
化石类世界自然遗产作为地球演化历史中动植物生命记录的突出例证,其自身及赋存环境对重新建构古地理、古气候、古生态等信息具有重要意义。了解化石类世界自然遗产的基本特征,有利于为全球范围内潜在化石遗址申报世界自然遗产提供借鉴... 化石类世界自然遗产作为地球演化历史中动植物生命记录的突出例证,其自身及赋存环境对重新建构古地理、古气候、古生态等信息具有重要意义。了解化石类世界自然遗产的基本特征,有利于为全球范围内潜在化石遗址申报世界自然遗产提供借鉴及更好地开展已有化石类世界自然遗产的保护管理工作。文章从全球分布特征、关键生物事件对全球范围内化石类世界自然遗产的基本特征进行研究,分析了贵州三叠纪化石群潜在的世界遗产价值,并提出贵州省三叠纪化石群的申遗策略:按照系列遗产申报的模式进行申报、按照世界自然遗产属性选择第八条评价标准申报,加强提名地的保护与管理。 展开更多
关键词 化石 世界自然遗产 基本特征 贵州三叠纪化石群 申遗策略
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西藏拉萨市林周盆地海相白垩系生物化石的发现及地质意义 预览
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作者 土登次仁 李兴鹏 +2 位作者 朱卫翁 央珍 边片 《高原科学研究》 2018年第2期12-17,共6页
在地质演化的漫长历史过程中,西藏地区留下了相当完整的海相白垩纪地层。对该时期海相沉积演化特征的研究,能够为该地区在印度板块和欧亚板块碰撞前的演化信息提供可靠的依据。文章以西藏拉萨市林周盆地为研究区域,以沉积作用的过程和... 在地质演化的漫长历史过程中,西藏地区留下了相当完整的海相白垩纪地层。对该时期海相沉积演化特征的研究,能够为该地区在印度板块和欧亚板块碰撞前的演化信息提供可靠的依据。文章以西藏拉萨市林周盆地为研究区域,以沉积作用的过程和方式为研究方法,对林周盆地地层进行分析的基础上,对该地区采集到的古生物化石进行分类以及对比分析。认为,西藏拉萨市林周盆地具有温暖湿润的古环境信息,且该区域白垩纪时期古地理环境是浅海环境,地史演化具有明显的海陆变迁特征。文章研究对林周盆地在白垩纪时期基本地理环境的推断和青藏高原在这一时期海进海退的地质构造演变理论的进一步研究具有促进作用。 展开更多
关键词 林周盆地 海相 白垩系 化石
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The Application of Principal Component Analysis to the Identification of Fagaceae Leaf Fossils
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作者 Jia Hui Sun Bainian 《中国地质文摘:英文版》 2018年第4期112-113,共2页
Abundant fossil records show that the Fagaceae has remained a dominant component in the Northern Hemisphere since the Cenozoic. However, due to the large number of living species, it is not easy to identify leaves to ... Abundant fossil records show that the Fagaceae has remained a dominant component in the Northern Hemisphere since the Cenozoic. However, due to the large number of living species, it is not easy to identify leaves to a particular species. Consequently, the identification of fossil leaves belonging to the Fagaceae is problematic. 展开更多
关键词 principal components analysis FAGACEAE FOSSILS application
新疆乌鲁木齐东部早二叠世枕状玄武岩火山岩系的发现及大地构造意义 预览 被引量:2
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作者 钟建华 倪良田 +14 位作者 邵珠福 孙宁亮 李旭平 刘选 郝兵 刘闯 杨冠群 葛毓柱 陈彬 罗可 黄雷桐 曲俊利 范莉红 王韶洁 王雅琳 《地质学报》 CSCD 北大核心 2018年第4期638-664,共27页
新疆乌鲁木齐东部野生动物园附近的下二叠统下部发育了一套以枕状玄武岩为代表的火山岩系。该玄武岩在公路上发育有两层,上部一层较厚,可达7~8m,下部一层2~3m。岩枕近圆形、肾状、枕状、条带状或蠕虫状等,多呈顶突底凹。岩枕长轴平行... 新疆乌鲁木齐东部野生动物园附近的下二叠统下部发育了一套以枕状玄武岩为代表的火山岩系。该玄武岩在公路上发育有两层,上部一层较厚,可达7~8m,下部一层2~3m。岩枕近圆形、肾状、枕状、条带状或蠕虫状等,多呈顶突底凹。岩枕长轴平行排列,长轴基本顺层面分布;有的岩枕中含大量海百合茎、珊瑚及腕足等生物化石。在TAS图中大部分样品位于玄武粗安岩,而在K2O-SiO2图上主要落在低K拉斑玄武岩区间。MnOTiO2-P2O5图解显示以岛弧为主,常量元素的特征总体上更接近岛弧玄武岩。在Hf/3-Th-Ta图解上也以岛弧为主;在Zr/4-2Nb-Y图解显示以火山弧为主,常量元素的特点总体上更接近岛弧玄武岩。微量元素原始地幔标准化蛛网图表明为同源岩浆产物,具高度相似的演化过程,多种微量元素判别图揭示岛弧-弧后盆地环境;稀土总量明显较低,在稀土元素球粒陨石标准化图解上,其稀土分布曲线一致性较好,呈轻稀土富集右倾型,Eu为负异常,揭示了乌东玄武岩岩浆有一定分异。稀土元素配分曲线与弧后盆地玄武岩(BABB)具有很好的一致性。U-Pb和谐年龄为283±8Ma,结合地层及古生物资料推测乌东玄武岩喷发的时间为早二叠世早期。乌东枕状玄武岩-灰岩之下有一套(磨拉石)底砾岩,初定为石炭-二叠系的界限。底砾岩之下为下石炭统的中厚层灰岩,具有明显的喀斯特化,为不整合接触,揭示在两者之间发生了造山作用。通过对新疆乌东早二叠世早期的枕状玄武岩的地质特征、地球化学特征、形成环境和时代的研究,表明乌东一带早二叠世主要为一个岛弧和弧后盆地环境,进一步揭示了北天山北缘石炭-二叠世碰撞闭合造山之后又发生了松弛扩张形成了弧后盆地,海水再度大规模入侵。最终的闭合碰撞造山的时间最早可能在晚二叠世。由于乌东枕状玄武岩在喷出地表后受到 展开更多
关键词 枕状玄武岩 岛弧 弧后盆地 早二叠世 化石 造山作用 乌东
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河北棺材山地区化石资源特征综述 预览
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作者 周明兴 贠杰 +1 位作者 高尚 何立 《甘肃冶金》 2017年第1期90-93,共4页
河北棺材山地区义县组地层中见大量古生物化石,主要包括:东方叶肢介,三尾拟蜉游,甲虫,蛉、薄氏辽宁枝,裂鳞果及植物碎片等。通过对地层、化石特征分析,认为研究区古生物化石作为“热河生物群”成员,对生物演化及地质发展演化研究具有... 河北棺材山地区义县组地层中见大量古生物化石,主要包括:东方叶肢介,三尾拟蜉游,甲虫,蛉、薄氏辽宁枝,裂鳞果及植物碎片等。通过对地层、化石特征分析,认为研究区古生物化石作为“热河生物群”成员,对生物演化及地质发展演化研究具有极为重要的作用,建议加强化石资源保护措施。 展开更多
关键词 义县组 棺材山 古生物化石 化石资源保护
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北疆博物院馆藏古生物化石标本的预防性保护 预览
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作者 崔冠瑜 《科学教育与博物馆》 2017年第2期136-139,共4页
近来,化石的预防性保护问题越来越受到重视,但具体的实践工作尚处于不断探索之中.北疆博物院尝试对馆藏 化石标本进行系统性的预防和保护,丰富了化石保护研究的工作经验,为实践向理论的提升迈出了跨越性的一步.
关键词 化石 预防性保护 北疆博物院
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粤西郁南—德庆地区奥陶系岩石地层序列及古生物化石特征 预览
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作者 许汉森 严成文 +5 位作者 李出安 林小明 牛志军 张献河 许冠军 王志宏 《华南地质与矿产》 CAS 2017年第3期207-214,共8页
粤西郁南—德庆地区奥陶系属类复理石碎屑岩建造,地层划分标志不清晰,古生物化石稀少,在地质填图和区域对比中可靠性不足。在野外地质调查及剖面测制的基础上,结合新发现双壳类、三叶虫、腕足类等化石,本文对该地区奥陶系岩石组合特征... 粤西郁南—德庆地区奥陶系属类复理石碎屑岩建造,地层划分标志不清晰,古生物化石稀少,在地质填图和区域对比中可靠性不足。在野外地质调查及剖面测制的基础上,结合新发现双壳类、三叶虫、腕足类等化石,本文对该地区奥陶系岩石组合特征、基本层序、沉积环境、地质时代及区域对比进行了阐述,为云开地块周缘早古生代的地层划分对比及区域地质演化提供了新的资料。 展开更多
关键词 生物化石 岩石地层 奥陶系 云开地区 广东省
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内蒙古北山地区三道明水一带早白垩世赤金堡组沉积特征及时代厘定 预览
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作者 张金龙 潘志龙 +6 位作者 陈超 张桂凤 张欢 李庆喆 王硕 张立国 张运强 《地质调查与研究》 2017年第1期29-34,80共7页
在进行内蒙古基东地区1/5万区域地质调查项目实施中,对内蒙古北山地区三道明水一带原来划9-5上侏罗统赤金堡群进行剖面测制,发现其为一套成熟度较低的粉灰色、绿灰色细碎屑岩与紫灰色粗碎屑岩组合。在该套地层中发现了大量的双壳类... 在进行内蒙古基东地区1/5万区域地质调查项目实施中,对内蒙古北山地区三道明水一带原来划9-5上侏罗统赤金堡群进行剖面测制,发现其为一套成熟度较低的粉灰色、绿灰色细碎屑岩与紫灰色粗碎屑岩组合。在该套地层中发现了大量的双壳类、腹足类、介形类、植物类及大型爬行动物类等生物化石,并对其进行了组合的划分。双壳类:Sphaeriumcf.jeholense(Grabau)-Arguniella subcentralisChernyshev组合,时代为早自垩世;腹足类:LioplacodesgansuensisPan-SinorificiumyumenensisGuo组合,时代为早白垩世;介形类:Cypridea-Mongolocypris-Lycopterocypris组合,多出现于早白垩世;苏铁类:Nilssoniasinens-Yabe&Oishi组合,时代为早白垩世;银杏类:Ginkgoitessp.组合,具有代表性,时代为早白垩世。通过综合分析,认为此套地层应归属为早白垩世。 展开更多
关键词 内蒙古北山地区 赤金堡组 古生物化石 早白垩世
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枣庄地区古生物化石类型及分布特征 预览
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作者 李春稼 鲁峰 +2 位作者 王子圣 肖广玲 徐蒙 《绿色科技》 2017年第22期121-122,127共3页
指出了化石是地质历史时期古生物存在的直接证据,是区域地层的划分对比、古气候古环境反演、生物群落演化的重要依据。枣庄地区古生物化石种类多样、分布范围广、富集程度高,是山东省古生物化石主要分区之一。针对枣庄地区古生物化石... 指出了化石是地质历史时期古生物存在的直接证据,是区域地层的划分对比、古气候古环境反演、生物群落演化的重要依据。枣庄地区古生物化石种类多样、分布范围广、富集程度高,是山东省古生物化石主要分区之一。针对枣庄地区古生物化石进行了系统地野外调查,在区内共发现11种古生物化石类型,并阐述了枣庄地区古生物化石的类型、分布特征,分析了古生物化石的地质意义。 展开更多
关键词 古生物化石 分布特征 价值分析 枣庄地区
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