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青海可可西里盆地是青藏高原腹地最大的沉积盆地。然而对于该盆地新生代地层的沉积时代目前仍然存在争议。可可西里盆地南侧雁石坪地区雅西措组中含丰富的介形类化石,该介形类动物群对青藏高原腹地新生代生物地层对比具有重要意义。文中通过对可可西里盆地南侧雁石坪地区通天河剖面进行系统的采样和室内分析,共获得652枚介形类壳体,共鉴定识别出14属48种,自下而上建立了2个介形类组合带,即Austrocypris cf. posticaudata-Candoniella albicans-Leucocythere tropis组合带和Ilyocypris errabundis- Darwinula stenimpudica组合带。通过与柴达木盆地、伦坡拉盆地、江汉盆地以及渤海湾沿岸等地区的介形类生物地层进行区域对比研究,推测可可西里盆地通天河剖面雅西措组的沉积时代为晚始新世—早渐新世。 相似文献
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本文描述的七个介形类化石新种是从山东济阳坳陷北部数百口井的上万个样品中获得的。这些新种分别发现在本区下第三系孔店组(始新统),沙河街组三段和东营组(渐新统)的泥质岩地层。样品来源于钻井的井壁取芯和岩 相似文献
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湘中地区下石炭统似无饰介科(Paraparchitidae)的几个新属种 总被引:1,自引:0,他引:1
我队自1978年以来在湖南中部地区地表和井下早石炭世地层,陆续采到丰富的介形类化石,其中以似无饰介科(Paraparchitidae)具后背刺的属种较多。笔者研究了这些具后背刺的介形类,计3属,包括1新属、7新种。这批材料的发现对我国早石炭世介形类的研究和地层对比都具有一定的意义。在似无饰介科中,具后背刺的属种较常见,自晚泥盆世开始出现,早石炭世大量繁盛,至二叠纪衰亡,它们具有一定的地层意义。B.Kellet 相似文献
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《微体古生物学报》2010,(4)
广州龙归盆地古新世介形类化石全部来自全取芯钻井剖面,据42口钻井1000个样品统计,发现介形类16属40种,本文描述其中15属39种。龙归盆地古新世介形类动物群以Cypris,Sinocypris,Cyprois,Li mnocythere四属分布最广、最常见,归属Sinocypris动物群,据其纵向分布规律,划分3个化石带,自下而上为:Ⅰ.Cypris con-cina带;Ⅱ.Sinocypris curtovata带;Ⅲ.Cyprois reniformis带。作者认为Ⅰ带的莘庄村组的时代属古新世早期,Ⅱ带的(土布)心组为古新世中期,Ⅲ带的宝月组为古新世晚期。 相似文献
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深海钻探计划(DSDP)31航次296站晚新生代介形类 总被引:1,自引:0,他引:1
本文研究了深海钻探(DSDP)31航次296站晚新生代介形类动物群的性质及其古海洋学意义.此站钻孔上部上新统至全新统以超微浮游生物软泥和粘土为主的16块岩芯中,共分析获得介形类化石8属11种,计有:Poseidonamicus major Benson, P. anteropunctatus Whatley et al., P. punctatus Whatley et al., Pennyella dorsoserrata (Brady), Henryhowella sp., Pterygocythere mucronalatum (Brady), Abyssocythere sp., Abyssocythereis sulcatoperforata (Brady), Pelecocythere sp., Krithe sp. 1和Krithe sp.2.这些介形类属种均为冷海域深海区介形类分子.由此表明,西北太平洋边缘地区在晚新生代曾为一深海区.在第四纪,其深度可能和现今296站的深度大致相当;在上新世,其深度可能更深一些.研究结果证实,深海底栖介形类属种的分布具全球性;在相当长的地质时期内,介形类属种的形态和壳饰都非常稳定,无明显变化.同时,进一步证实,介形类个体大小变化与深度相关,同一种介形类壳体随水域深度加深而增大. 相似文献
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内蒙古海拉尔盆地南部地区晚白垩世青元岗组介形类 总被引:1,自引:0,他引:1
内蒙古海拉尔盆地南部探井青元岗组红色碎屑岩中发现较丰富的介形类化石,即下段的Ahanicypris obesa-Talicypridea triangulata组合和上段的Chinocypridea augusta-Talicypridea qingyuangangensis组合,这些介形类化石地方性色彩强烈,表现为以具冠状壳喙类型的Ahanicypris,Talicypridea,Chinocypridea和网纹发育的Harbinia等属繁盛为特征,反映了中国东北地区晚白垩世晚期介形类动物群面貌。根据介形类化石组合特征及其分布规律,可以与松辽盆地晚白垩世四方台组的介形类动物群对比,时代为晚白垩世Maastrichtian期。 相似文献
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本文较为详细地介绍由Kontrovitz首先使用的介形类人工内模的铸型方法。基于某些海生或淡水现生、化石介形类Echinocythereis margaritifera,Actinocythereis thompsoni, Henryhowella florienensis 和Cytherissa lacustris内模的电子扫描显微镜观察,介绍了其中具眼窦介形类的跟窦结构及术语;报道了它的形态特点和差异;讨论了服窦形态在介形类分类、个体发育,尤其是利用它在判断生物生活水体深度的潜在意义。首次报道了淡水介形类Cytherissa lacustris内模上垂直毛细管及边缘毛细管的形态特点,这些微细结构过去也难以在电镜下清楚地观察和研究。介形类人工内模的研究,为现生或化石介形类的深入研究开辟了一条新途径。 相似文献
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三水盆地古近系介形类化石主要来自全取芯钻井剖面.据170口钻井3 855个样品统计,发现介形类17属49种,本文描述其中16属47种,包括2个新种.三水盆地古近纪的介形类动物群以Sinocypris,Cyprois,Limno-cythere三属分布最广、最常见,故称Sinocypris-Cyprois-Limnocythere动物群,简称Sinocypris动物群.根据介形类化石纵向分布和富集规律,选择最常见主要属种的鼎盛时期建立5个化石带(顶峰带),自下而上为:Ⅰ.Cyprisconcina带;Ⅱ.Sinocypris pulchra带;Ⅲ.Cyprois reniformis带;Ⅳ.Sinocypris reticulata带;Ⅴ.Limnocythere ir-recularis带.本文把古新统(E1)/始新统(E2)界线放在Ⅲ/Ⅳ带之间,认为Ⅰ-Ⅲ带的莘庄村组、饰心组、宝月组的时代为古新世,分别为早、中、晚期,Ⅳ、Ⅴ两带的华涌组的时代为早始新世. 相似文献
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广东南雄盆地南雄群的介形类动物群 总被引:4,自引:3,他引:1
南雄群及其介形类化石在我国晚白垩世非海相地层划分对比中占重要地位,主田和杨梅坑剖面主田组和浈水组中有270个样品含介形类化石,计有23属(2亚属)99种(12新种)。南雄群介形类动物群是以Talicypridea,Cypridea,Nanxiongium,Candoniella等4属为主,称Talicypridea Cypridea Nanxiongium动物群(简称Tali cypridea动物群)。该动物群在我国和蒙古的非海相地层中广泛分布,时代属晚白垩世中—晚期。 相似文献
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在柴达木盆地红柳泉地区红探2井红水沟组中识别出介形类化石3属9种(含2个未定种):Cetacella qaidamensis Li et Yang, 1983、Djungarica tracta Li et Yang, 1983、Djungarica sp.、Alicenula incurva (Bate, 1967)、?A.longicylindrica (Qi, 1985)、A. paramagna (Li et Yang, 1983)、A. maanshanensis (Hou et al., 2002)、A. jinhuaensis (Li,1984)、Alicenula sp.。通过介形类化石生物地层对比,明确红水沟组的沉积时代为晚侏罗世。红水沟组介形类动物群指示晚侏罗世柴达木地区发育淡水湖泊、河流以及季节性的小水塘。 相似文献
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依据闸岗剖面地表及钻井样品的分析鉴定,粤西怀集盆地白垩纪闸岗群马屋组产介形类化石10属17种,本文描述其中9属14种,包括1新种。介形类组合以Eucypris最繁盛,次为Ziziphocypris和Darwinula,称Eucypris hubeiensis-Ziziphocypris simakovi-Darwinula leguminella组合。马屋组与湖北贾店组的介形类组合面貌非常相似,可以进行对比,层位大体相当,其时代应属早白垩世最晚期(Albian)-晚白垩世早期(Cenomanian)。 相似文献
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OBSERVATIONS ON THE VARIATIONS IN SIZE OF THE A REGION OF ARTHROPOD MUSCLE 总被引:3,自引:3,他引:0
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John Aronson 《The Journal of cell biology》1963,19(2):359-367
The muscles of three different arthropods, a mite, a fly, and an ostracod, show variations in the length of the A region within a given individual. There is no indication that the observed differences in A band length are related to the functional state of the muscle since little, if any, decrease in the length of the A bands was noted when sarcomeres shortened. The length of the A region was determined by polarized light microscopy and in the case of the mite and the ostracod this measurement was made on intact muscles. It is concluded that the size of the A filaments in an individual can vary in a manner unrelated to immediate functional changes. The I filaments may vary in size, but this could not be clearly demonstrated. 相似文献
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Katsura Yamada Yuichiro Tanaka Toshiaki Irizuki 《Palaeogeography, Palaeoclimatology, Palaeoecology》2005,220(3-4):255-271
Fossil ostracod assemblages from the upper Pliocene Kuwae Formation of the Kurokawa area, Niigata Prefecture, central Japan were investigated to discern the high resolution paleoceanographic changes in the Sea of Japan during the transitional interval from a warm to a cold climate in the period from 2.80 to 2.55 Ma, dated previously from diatom and nannofossil datum horizons and magnetostratigraphy. The studied ostracod assemblages did not contain Tsushima Warm Core Current taxa known in the modern Sea of Japan, and most of them are cryophilic and circumpolar. The combinations of recognized fossil ostracod assemblages differ from the modern ones of the region, suggesting that the shallow water area was probably colder than that of today. The Kuwae Formation was deposited during several bathymetric fluctuations between upper bathyal and lower sublittoral zone. A large-scale shift from upper bathyal to lower sublittoral condition, which dominated the depositional setting, occurred at 2.70 Ma in the Tainai area, and occurred rapidly during 40,000 years (2.70–2.66 Ma). This shallowing mirrored the shifts induced by global cooling recorded in various evidence such as oxygen isotope data from deep-sea core. Detailed paleodepth fluctuations show four shallowing events that occurred in this area between 2.80 and 2.55 Ma. The third and fourth shallowings at 2.70 and 2.60 Ma were both responses to global climatic cooling corresponding to the oxygen isotope stages G6 and/or G4, and to stage 104, respectively; deduced from the contemporary abundance of cold water species in the study section, observations of shallowing events in the northwestern Pacific Ocean, and the IRD event recorded in high latitude seas. 相似文献