南极乔治王岛菲尔德斯半岛西湖柱状剖面藻类化石...   总被引：4，自引：1，他引：3  

刘清泗  降廷梅 《南极研究》1990,2(2):28-35

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浅谈鄂北豫南界区的几个地质问题     

赵银胜 《河南国土资源》2001,(4)

笔者以近 30年来的地质成果资料 ,从鄂北地层层序与成因 ,古生物类型与生态 ,岩石化学、微量元素、稀土元素、重矿物特征 ,岩浆岩分布 ,地球物理异常及类蛇绿岩、蓝片岩和榴辉岩带的存在等 ,将鄂北地区划分出三个古生物地层构造单元。以枣阳市鹿头镇—广水市郝店镇剪切带、连接新城—广济断裂为界 ,之北是桐柏古生物地层构造区 ,之南是扬子北部边缘古生物地层构造区。以襄樊—广济断裂为界 ,之北是扬子北部边缘古生物地层构造区 ,之南是扬子地台古生物地层构造区  相似文献   

浙江羚羊头骨化石的发现与研究     

金幸生  吴维棠  杜天明 《浙江国土资源》1994,(2)

本文论述了1992年采自浙江开化的一件羚羊头骨化石。标本经记述对比研究后，认为它代表了GazelleBlaimville的一个新种，命名为开化羚羊（新种）Gazellekaihuaensissp．nov，时代也属于晚更新世。尚系浙江首次发现，这对羚羊的分布范围及其古地理、古环境等方面的研究具有一定的意义。  相似文献   

试论建设栖霞山国家地质公园的意义、优势与可行性     

周建华  李峰 《江苏国土资源》2003,(9):17-20

论述了栖霞山申报建设国家地质公园的意义。介绍了栖霞山地区拥有的地学内涵和人文景观。分析了栖霞山地区建成国家地质公园的经济可行性和技术可行性。  相似文献   

秋风飒飒访怪鸟--棘鼻大平房鸟出土记     

李莉  程绍利 《国土资源》2006,(3):56-57

2004年,对我们来说是值得回味和庆贺的一年。因为在那一年,我们这个刚刚组建不久的从事古生物研究的年轻科学集体,在辽西朝阳县大平房挖掘到第一枚属于我们自己的古鸟类化石。它的意义暂且不论,至少过去没有见过这样怪异的鸟化石标本。我记得十分清楚,那是在秋天。朝阳地区属于干旱气候区,秋天来得早, 少雨而干燥,草已经枯了,挂满黄丝的  相似文献   

应用列联表方法研究化石群落关联性     

林和平  苑清扬 《长春地质学院学报》1994,24(1):96-101,109

应用列联表方法研究化石群落间的关联性问题。列联表方法是从变量的独立性出发研究两两变量间的关系。该方法的优点是不但能用数字表示两变量间的关联程度，而且还对其关联性作显著性检验，使所得结果更为精确。本文介绍的数学原理和计算方法，力求简明易懂。最后选择了实际例子借以说明列联表方法在研究此问题上的良好效果。  相似文献   

The GSSP of the Second （Upper） Stage of the Lower Ordovician Series： Diabasbrottet at Hunneberg, Province of Vaeistergoetland, Southwestern Sweden     

StigM.Bergstroem AnitaLoefgren JoergMaletz 《《幕》》2004,27(4):265-272

Diabasbrottet, selected by the International Subcommisson on Ordovician Stratigraphy and in 2002 ratified by the International Commission on Stratigraphy as the GSSP of the Second (Upper) Stage of the Lower Ordovician, is located on the Hunneberg Mountain in southwestern Sweden. The stratigraphic succession represents an outer shelf environment near the Baltic Shield margin. The shale-dominated, biostratigraphically complete, richly fossiliferous boundary interval is completely exposed in a disused quarry. The GSSP is in the lower TФyen Shale 2.1 m above the top of the Cambrian and is marked by the first appearance of the graptolite Tetragraptus approximatus Nicholson. The boundary interval contains a diverse graptolite fauna and biostratigraphically diagnostic conodonts and trilobites that make it possible to define the boundary in terms of zone schemes based on these groups. In this respect, the Diabasbrottet and nearby sections are unique in the world among described localities having this boundary interval. Based on the appearance of T. approximatus, the base of the Second Stage can be identified in many graptolitiferous successions round the world but this level is currently more difficult to recognize precisely in some carbonate sequences outside Baltoscandia. We propose the Second Stage be called the Floan Stage. It is named for the Village of Flo, which is situated about 5 km southeast of the GSSP.  相似文献   

Turbulence and Fossil Turbulence in Oceans and Lakes     

Pak-TaoLeung CarlH.Gibson 《中国海洋湖沼学报》2004,22(1):1-23

Turbulence is defined as an eddy-like state of fluid motion where the inertial-vortex forces of the eddies are larger than any of the other forces that tend to damp the eddies out. Energy cascades of irrotational flows from large scales to small are non-turbulent, even if they supply energy to turbulence. Turbulent flows are rotational and cascade from small scales to large, with feedback. Viscous forces limit the smallest turbulent eddy size to the Kolmogorov scale. In stratified fluids, buoyancy forces limit large vertical overturns to the Ozmidov scale and convert the largest turbulent eddies into a unique class of saturated, non-propagating, internal waves, termed fossil-vorticity-turbulence. These waves have the same energy but different properties and spectral forms than the original turbulence patch. The Gibson (1980, 1986) theory of fossil turbulence applies universal similarity theories of turbulence and turbulent mixing to the vertical evolution of an isolated patch of turbulence in a stratified fluid as its growth is constrained and fossilized by buoyancy forces. Quantitative hydrodynamic-phase-diagrams (HPDs) from the theory are used to classify microstructure patches according to their hydrodynamic states. When analyzed in HPD space, previously published oceanic datasets showed their dominant microstructure patches are fossilized at large scales in all layers. Laboratory and field measurements suggested phytoplankton species with different swimming abilities adjust their growth strategies by pattern recognition of tur-bulence-fossil-turbulence dissipation and persistence times that predict survival-relevant surface layer sea changes. New data collected near a Honolulu waste-water outfall showed the small-to-large evolution of oceanic turbulence microstructure from active to fossil states, and revealed the ability of fossil-density-turbulence patches to absorb, and vertically radiate, internal wave energy, information, and enhanced turbulent-mixing-rates toward the sea surface so that the submerged waste-field could be detected from a space satellite (Bondur and Filatov, 2003).  相似文献   

意外的碎片和意外北票龙--偶然与必然,科学研究之路     

乔樵 《国土资源》2002,(5):54-55

1997年深秋,一队车队缓缓开进了辽宁北票一个叫四合屯的小山村。作为我国研究恐龙的后起之秀,年轻的徐星博士也随中国科学院古脊椎动物研究所  相似文献   

穿越时空拜见恐龙—走进甘肃启靖恐龙足印群国家地质公园     

刘崇贵 《国土资源》2002,(5):56-57

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