The Pleistocene vermicular red earth in South China signaling the global climatic change: The molecular fossil record   总被引：11，自引：3，他引：8  

谢树成  易轶  刘育燕  顾延生  马振兴  林文姣  王先彦  刘刚  梁斌  朱宗敏 《中国科学D辑(英文版)》2003,46(11):1113-1120

The widespread (with a distribution area of 2.2?06 km2) Pleistocene red earth is believed to be one of the most detailed records of the environmental and climatic changes in South China. However, the previous research mainly covers the rough dating, pedo…  相似文献   

西秦岭拉尔玛金矿热水硅质岩中的分子古生物学研究   总被引：1，自引：0，他引：1  

林丽  朱利东 《地球科学》1998,23(5):503-507

拉尔玛金矿热水成因硅质岩中的分子古生物学研究表明;其正烷烃以碳数分布于Ｃ１６～Ｃ３６,主峰碳为Ｃ２９为特征,除此,还鉴定出规则类异戊二烯和胡萝卜烷系列化合物,烷基环己烷系列,长链三环萜烷,五环三萜烷,甾类分子化石和烷基噻吩系列化合物,烷基四氢噻吩系列化合物,二苯并噻吩,甲基二苯并噻吩等含硫芳烃以及菲及其同系物等非含硫芳烃分子化石,氯仿沥青“Ａ”族组成Ｑ型聚类分析表明拉尔玛金矿硅质岩与现代蓝绿藻和绿  相似文献   

民和盆地侏罗系地层划分与对比   总被引：2，自引：0，他引：2  

张虎权  王廷栋  阎存凤  袁剑英 《地层学杂志》2007,31(1):62-67

民和盆地是一个油、煤、气伴生的中新生代陆相盆地,侏罗系地层层序自下而上划分为下侏罗统炭洞沟组(大西沟组)、中侏罗统窑街组、红沟组、上侏罗统享堂组。中侏罗世早、中期气候温暖湿润,形成了以沼泽相煤系地层和湖相暗色泥岩、油页岩为主的生油建造,晚侏罗世至白垩纪气候较为干燥,形成了以河流相为主的砂砾岩储集建造。根据古生物、岩性、电性、含煤性、构造、古气候等地层划分对比标志,重新确立了盆地的地层系统,建立了盆地中新生界地层标准剖面,为盆地石油勘探奠定了坚实的基础。  相似文献   

从脊椎动物化石角度论云南曲靖下、中泥盆统界线   总被引：2，自引：0，他引：2  

朱敏  王俊卿 《地层学杂志》1996,20(1):58-63

根据早期脊椎动物化石证据及生物地层对比,云南曲靖穿洞组的时代为晚Emsian期。该地区下、中泥盆统界线应划在穿洞组与海口组之间,或从穿洞组顶部穿过。  相似文献   

鄂西早三叠世南漳-远安动物群地层分布特征          下载免费PDF全文

阎春波  李姜丽  程龙  赵璧  邹亚锐  牛东毅  陈刚  方子晨 《地球科学》2021,46(1):122-135

在区域地质调查的基础上,以远安张家湾嘉陵江组剖面为重点,通过对南漳和远安交界地区下三叠统嘉陵江组剖面测制和多处化石点考察,重新厘定研究区内嘉陵江组岩性特征.认为研究区内的嘉陵江组划分为3个岩性段更为合理,产南漳-远安动物群的纹层状灰岩段位于二段顶部.通过系统化石发掘和张家湾剖面详细描述,初步查明了南漳-远安动物群的垂向分布特征:在30余米厚的纹层状灰岩段中均有海生爬行动物产出,只是丰度和分异度存在一定差异,其中7组岩层相对富集,顶部最为丰富.在此基础上,通过地层对比和所有化石点综合分析,将动物群自北东向南西划分为A~D 4个区带,依次命名为绝缘区、边缘区、相对富集区和富集区,分别对应化石从无到有、丰度逐渐变化及水深逐渐加深的过程,总体上仍处于水体循环受限的台内洼地或潟湖相环境.此次查明动物群的分布特征将为研究动物群生物与环境协同演化及其对早三叠世生物复苏的响应奠定良好的基础.   相似文献   

辽宁古生物化石特征与保护利用模式分析     

吴子杰  邱隆伟  高福亮  陈军典  马文坡  赵忠海  郑伟  仲米山  耿树峰  衣欣  王旭日  高永钊  胡义 《地质论评》2023,69(2):428-440

辽宁拥有丰富的古生物化石资源,它们在中国乃至世界范围内具有较高知名度,具有非常高的科研、科普和社会经济价值。根据近年来辽宁古生物化石资源的调查成果资料,对辽宁古生物化石的类型、时空分布规律等进行总结研究,并分析了辽宁古生物地质遗迹的保护利用现状,对其保护和利用模式进行分析探讨。提出了化石保护与利用多元化发展模式,并挖掘化石的最大优势,对化石资源研学旅行开发进行探讨和设计,以化石文化为依托打造化石衍生文创产品。对古生物化石特征的总结以及对保护利用模式的探讨,能够为辽宁古生物化石的深入研究工作提供基础材料,为辽宁的古生物化石产业发展提供思路。  相似文献   

河北雄县全新世中期海侵地层的发现     

袁路朋  王永  姚培毅  江南  董进  田飞  汤文坤 《地质通报》2019,38(6):911-915

渤海湾全新世海侵是第四纪晚期全球气候变化的重要事件,以往研究表明渤海湾西岸全新世海侵已经深入到文安县。本次研究在文安县西北30km的雄县15BZ02剖面第8层底部灰褐色粉砂中发现大量缢蛏新种,壳体呈斜交或垂直层面产出,反映了潮间带中下部的内湾、河口环境。同时,在该层段发现了海相介形虫Tanella opima。由此推断,渤海湾西岸海侵于全新世中期(6970～6670cal a BP)达到最大范围,海水曾经到达雄县北。  相似文献   

First Record of Hoplictis(Carnivora,Mustelidae) in East Asia from the Miocene of the Ulungur River Area,Xinjiang,Northwest China     

Alberto VALENCIANO  JIANGZUO Qigao  WANG Shiqi  LI Chunxiao  ZHANG Xiaoxiao  YE Je 《《地质学报》英文版》2019,93(2):251-264

The first unequivocal remains of medium to large-sized mustelids from the middle Miocene Halamagai and Kekemaideng formations have been found in the Ulungur River area, Xinjiang, northwestern China. These new fossils are referred to the hypercarnivorous mustelid Hoplictis Ginsburg, 1961 and denote the first record of the genus in East Asia.We define Hoplictis baihu n. sp., for the mustelid from Tieersihabahe(Halamagai Fm.), which represents the smallest species of the genus. This primitive form is closer to H. florancei and H. noueli than to H. anatolicus and later, larger and more derived Hoplictis spp., from Europe and North America. A large toothless mandible from Duolebulejin(Kekemaiden Fm.) is assigned to Hoplictis cf. helbingi, and it presumably might represent the first record of H. helbingi outside Western Europe. The systematic position of Hoplicitis in relation to Ischyrictis with which it is similar is clarified. The occurrence in East Asia of two species of Hoplictis greatly expands the known distribution and diversity of the genus, and supports a Palaearctic Neogene dispersal event of carnivorans between Europe and Asia during the late Shanwangian–early Tunggurian equivalent to MN5–6 in Europe, and indication of another dispersal event from Europe to North America,through Northwest China during the late Tunggurian, equivalent to MN7–8 in Europe.  相似文献   

Ordovician strata in the Cliefden Caves area,New South Wales: a case study in the preservation of a globally significant paleontological site     

I. G. Percival  B. D. Webby  H. D. T. Burkitt 《Australian Journal of Earth Sciences》2019,66(6):869-877

The Cliefden Caves area in central-western New South Wales includes the scientifically most important and irreplaceable examples of fossiliferous Ordovician rocks in the State. Exposures of the stratigraphically lower parts of the Cliefden Caves Limestone Subgroup on the aptly named Fossil Hill are world-famous among paleontologists and internationally significant for preserving the earliest in situ shell beds documented in the literature. They also contain some of the oldest known rugose corals, and an exceptional example of one of the oldest coralline biostromes, as well as many examples of invertebrate fossils and cyanobacterial mat structures that either are unique to this locality or were first described from here. Other stratigraphic levels throughout the total 363?m-thick Cliefden Caves Limestone Subgroup are similarly endowed with highly significant fossils, such as a globally unique in situ shell bank with rare examples of the trimerellide brachiopod Belubula spectacula, a wealth of shelly fossils and trilobites on Dunhill Bluff (adjacent to Fossil Hill to the east), and the appropriately named Trilobite Hill. Less well known to the general public, but of international importance to paleontologists, is the unique deep-water sponge fauna of the overlying Malongulli Formation that occurs at several levels in limestone lenses within this unit. Fossils from the Cliefden Caves Limestone Subgroup and the Malongulli Formation have been documented in more than 60 scientific papers and monographs since paleontological investigations into the site were first published in 1895. Despite concerted scientific endeavour in the region over the past 50?years, much more study needs to be done to fully document the paleontological riches of the Cliefden Caves area. These sites are interpreted as the remains of a tropical island, fringed by limestone and flanked by deep-water environments in which the Malongulli Formation was deposited. Preservation of such islands is exceptionally rare in the geological record. It is therefore vital for the area to remain accessible to scientific researchers to continue their studies. Flooding of the Belubula Valley by a proposed dam downstream from the Cliefden Caves area would hinder future research work on this unique geoheritage resource. Fortunately, a successful public campaign has led to listing of the site on the State Heritage Register that will provide essential protection of the caves from inundation while ensuring continued access to researchers.  相似文献