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1.
周口店地区第四纪哺乳动物群的演化与环境变迁探讨 总被引：2，自引：0，他引：2
讨论了Ａｌｉｌｅｐｕｓａｎｎｅｃｔｅｎｓ、ＨｙｐｏｌａｇｕｓｂｒａｃｈｙｐｕｓＬｅｐｕｓｓｐ．、Ｓｃｉｕｒｏｔａｍｉａｓｐｒａｅｃｏｘ、ＡｌｌｏｃｒｉｃｅｔｕｓｔｅｉｌｈａｒｄｉＣｒｉｃｅｔｉｎｕｓｖａｒｉａｎｓ、Ｈｙｐｅｒａｃｒｉｕｓｙｅｎｓｈａｎｅｎｓｉｓ、Ａｌｌｏｐｈａｉｏｍｙｓｃｆ．ｐｌｉｏｃａｅｎｉｃｕｓ、Ｐｒｏｅｄｒｏｍｙｓｃｆ．ｂｅｄｆｏｒｄｉ、Ｃｈａｒｄｉｎｏｍｙｓｎｉｈｅｗａｎｉｃｕｓ、Ｍｕｓｃｆ．ｍｕｓｃｕｌｕｓ和Ａｐｏｄｅｍｕｓｄｏｍｉｎａｎｓ的地史分布。根据哺乳动物群的分析与对比，得出第１８地点为早更新世早期，第１２地点、东洞地点为早更新世中期，第９地点、西洞地点为早更新世晚期，第１３地点为早更新世末期至中更新世初期，第１、２、５、６、１１、１０、２１、２３及上店洞地点为中更新世，新洞为中更新世晚期至晚更新世早期，东岭子洞为晚更新世，山顶洞为晚更新世晚期。还讨论了周口店地区一些主要第四纪哺乳动物群的生态类型特点，第四纪的气候波动及生态环境变迁。 相似文献
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周口店太平山北坡早更新世洞穴地层的划分 总被引：3，自引：0，他引：3
１９８５年，曹伯勋等在周口店太平山北坡发现了一个早更新世洞穴－洼地堆积地点（东洞），并作了初步报导。１９９２～１９９３年，笔者又对该剖面进行了哺乳动物化石的系统采集工作，获得了丰富的化石，为确定东洞动物群的性质及该剖面地层时代提供了确凿证据。研究表明该地点堆积物形成于１．６７～０．９７ＭａＢ．Ｐ，太平山组应包括整个剖面。 相似文献
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广西玉林早泥盆世早期腕足动物生物地层研究 总被引：1，自引：0，他引：1
在广西玉林樟木地区早泥盆世北均塘组、良合塘组、樟木组３５属４８种腕足动物演化和地层分布特征研究的基础上,建立了６个腕足动物生物带（自下而上）：１．Ｑｕａｄｒｉｔｈｙｒｉｎａｅｘｐａｎｓａ－Ｐｒｏｄａｖｉｄｓｏｎｉａｍｉｒａｂｉｌｉｓ带;２．Ｇｒａｙｉｎａｍａｇｎｉｆｉｃａｇｕａｎｇｘｉｅｓｉｓ－Ｓｃｈｉｚｏｐｈｏｒｉａｓｕｌｃａｔｉｎａ带;３．Ｒｅｔｉｃｕｌａｒｉｏｐｓｉｓｃｏｓｔａｔｕｓ带;４．Ｇｒａｙｉｎａｍａｇｎｉｆｉｃａｓｉｎｉｃａ带;５．Ｑｕａｄｒｉｔｈｙｒｉｓｒｏｂｕｓｔａ－Ｂｏｕｃｏｔｉａ带;６．Ｑｒｉｅｎｔｏｓｐｉｒｉｆｅｒｗａｎｇｉ带。依据国际对比和与笔石的层位关系认为：第１－３带为晚洛赫柯夫期,并且１、２、３带很可能分别相当晚洛赫柯夫早、中、晚期;第４带为早布拉格早期;第５、６带分别相当中、晚布拉格期。 相似文献
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多年冻土区短桩架空通风基础房屋的模型试验研究 总被引：2，自引：5，他引：2
本介绍了工程建筑物基础和多年冻土地基整体的相似模型试验，试验结果与实体取得良好的一致。从动态过程肯定了持力层为含土冰层时，冻土允许承载力Ｒｆ的可靠性，同时，明确了可依据冻土层年平均地温Ｔｃｐ＝－２．５℃时，持力层（平均）地温Ｔ＝－０．５℃，允许承载力Ｒｆ＝０．１ＭＰａ，只能建一层平房，当Ｔｃｐ＝－４．０℃时，Ｔ＝－１．０－１．２℃，Ｒｆ＝０．１５－０．１７ＭＰａ，可有条件地建二层楼房。 相似文献
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河南酮柏地区三叠纪早期放射虫动物群及其地质意义 总被引：12，自引：3，他引：12
本文描述了采自河南南部桐柏地区蔡家凹大理岩中的放射虫化石，共计７属８种（其中１新属２新种），包括Ａｒｃｈａｅｏｓｐｏｎｇｏｐｒｕｎｕｍ ｃｏｍｐａｃｔｕｍ Ｎａｋａｓｅｋｏ ｅｔ Ｎｉｓｈｉｍｕｒａ，Ｙａｎｇｉａ ｃｈｉｎｅｎｓｉｓ Ｆｅｎｇ，Ｓｈｅｎｇｉａ ｙｉｎｉ（Ｆｅｎｇ），Ｃｅｎｏｓｐｈａｅｒａ ｓｐ．，Ｔｒｉａｓｓｏｃａｍｐｅ？ｓｐ．，Ｐａｃｔａｒｅｎｔｉｎｉａｓｐ．，Ｔｒｉａｓｓｏｎｍ 相似文献
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安徽省古沛盆地白垩纪红层中发现的鸟类足迹 总被引：1，自引：0，他引：1
１９８８年４月，在安徽古沛盆地晚白垩世邱庄组中找到Ａｑｕａｔｉｌａｖｉｐｅｓａｎｈｕｉｅｎｓｉｓｓｐ．ｎｏｖ．１９８９。该鸟类足迹产于邱庄组上段黄色细砂岩与泥岩互层的泥岩层面上。有五个明显的脚印，按一定方向前进。脚印大小仅１０．５ｃｍ￣２，步距一般为５．５ｃｍ左右，有一后距，左右两趾夹角为１２８°左右。自第三个脚印起突然右折。标本显示，该动物体态轻盈，行动敏捷，具在周围水草丰盛的河漫滩上涉水觅食的动态习性。 相似文献
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本文描述异珊瑚标本采自贵州威宁老桥下石炭统上司组,包括２属７种,其中新种４个及３个未知种,新种有：Ｈｅｘａｐｈｙｌｌｉａｌａｏｑｉａｏｅｎｓｉｓｓｐ．ｎｏｖ．Ｈ．ｃｒａｓｓｉｅｐｔａｓｐ．ｎｏｖ．Ｈ．ａｂｎｏｒｍｉｓｓｐ．ｎｏｖ．ｈ．ｗｅｉｎｉｎｇｅｒｓｉｓｓｐ．ｎｏｖ。 相似文献
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老爷庙组的命名者认为这套地层属于泥盆—石炭系过渡层，在地质图上标为早石炭世。新材料表明，植物大化石Ｌｅｐｔｏｐｈｌｏｅｕｍｒｈｏｍｂｉｃｕｍ－Ａｒｃｈａｅｏｐｔｅｒｉｓｆｉｓｉｌｉｓ－Ｃｙｃｌｏｓｔｉｇｍａｓｐ．组合的时代应属晚泥盆世晚期，孢子化石Ｒｅｔｕｓｏｔｒｉｌｅｔｅｓｓｉｍｐｌｅｘ－Ａｐｉｃｕｌｉｔｕｓｉｓｐｏｒａｈｕｎａｎｅｎｓｉｓ（ＳＨ）组合显示的时代也为晚泥盆世晚期，从而纠正了这一地层属于泥盆—石炭系过渡层的观点。 相似文献
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利用流变学、构造岩组构学和岩石物理学综合方法,研究了女山地区尖晶石－石榴石二辉橄榄岩幔源包体．根据Ｂｅｒｔｒａｎｄ和Ｍｅｒｃｉｅｒ温度计和Ｎｉｃｋｅｌ和Ｇｒｅｅｎ压力计方法,利用ＴＥＭＰＥＳＴ程序分别计算了包体平衡温度和压力为１１００℃,１．９ＧＰａ（６３ｋｍ）．根据温度和压力对地震纵波（Ｖｐ）的影响系数,计算了原地（ｉｎｓｉｔｕ）温度和压力条件下的Ｖｐ速度为７．９３ｋｍ·ｓ－１,这个数值与东澳大利亚地热区的相应包体的Ｖｐ值（８．０ｋｍ·ｓ－１）相近．这些初步成果为郯庐断裂南段岩石圈结构分层和岩石物理特征提供了新的约束条件． 相似文献
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四川通江诺水河二叠纪-三叠纪界线地层牙形石的发现 总被引：3，自引：1，他引：2
川东北地区碳酸盐台地相区二叠系-三叠系界线划分一向存在分歧,因为在二叠系与三叠系之间发育一套40-100m的白云岩的时代缺乏古生物依据。针对这一问题,在四川通江诺水河剖面进行地层古生物研究,在剖面34层和41层的白云岩中首次分别发现了牙形石化石Hindeodus latidentatus、Hindeodus typicalis和Hindeousminutus,Hindeous parvus、Isarcicella cf.staeschei、Isarcicella isacica。根据当前国内外古生物学的研究成果,34层的牙形石属于晚二叠世长兴期的化石,41层中的牙形石为早三叠世印度期的化石。结合两者的之间的岩石地层特点,初步将通江诺水河剖面的二叠系-三叠系的界线置于38层与39层、即白云岩与灰岩之间。 相似文献
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黑龙江省东部Aucellina(双壳类)的发现 总被引：27，自引：11，他引：16
<正> 黑龙江省东部的龙爪沟群分布在虎林、密山、宝清和饶河县境内,鸡西群见于鸡西、穆 棱、勃利、双鸭山、绥滨和集贤等盆地 中。虎林地区的龙爪沟群从下自上分 为裴德组、七虎林组、下云山组、上云 山组(包括曙光组)和珠山组,鸡西盆 地的鸡西群分为滴道组、城子河组(包 相似文献
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许家窑遗址是中国旧石器时代中期的一处重要考古遗址,按照地层古生物学常规判断,其地层为上更新统下部.许家窑遗址是泥河湾盆地乃至东亚地区发现的上更新统包含古人类及古哺乳动物化石和旧石器时代考古遗物最丰富的一个地层剖面.许家窑遗址的古地磁测年的分析存在重大理念误区,其"早更新世晚期至中更新世早中期"的断代结论令人难以置信. 相似文献
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Biodiversity and Sequence of the Middle Triassic Panxian Marine Reptile Fauna, Guizhou Province, China 总被引：2，自引：0，他引：2
JIANG Dayong Ryosuke MOTANI HAO Weicheng Olivier RIEPPEL SUN Yuanlin Andrea TINTORI SUN Zuoyu Lars SCHMITZ 《《地质学报》英文版》2009,83(3):451-459
Abstract: The Middle Triassic Panxian fauna is a physical marker and representative record of the rapid recovery of the Triassic marine ecosystem following the Early Triassic stagnant stage after the end-Permian mass extinction. Ten marine reptile taxa have been found from the 1.82–2.10 m-thick fossiliferous level in the Upper Member of the Guanling Formation, which can be subdivided into three marine reptile beds through the analysis on the stratigraphic distributions of fossil reptiles. The Lower Reptile Bed yields the sauropterygians Placodus inexpectatus Jiang et al., 2008 and Lariosaurus hongguoensis Jiang et al., 2006, the ichthyopterygians Xinminosaurus catactes Jiang et al., 2008 and Phalarodon cf. Phalarodon fraasi Merriam, 1910, associated with Mixosaurus panxianensis Jiang et al., 2006, representing a stage of predominance of durophagous taxa. In this bed, the large complete skeletons may reach up to 2.3 m in length, and lithofacies and chemostratigraphic analyses indicate a relatively deep carbonate platform with an oxic water environment near the bottom, as well as a rising sea level. The Middle Reptile Bed yields the sauropterygian Nothosaurus yangjuanensis Jiang et al., 2006 and the archosaur Qianosuchus mixtus Li et al., 2006, associated with Mixosaurus panxianensis Jiang et al., 2006. The fossils in this bed are characterized by its pincering dentition and large overall body size, with the largest possibly exceeding 3 m in length. This bed might represent a time of deepest basin with relatively anoxic condition near the bottom. The Upper Reptile Bed yields the sauropterygians Wumengosaurus delicatomandibularis Jiang et al., 2008, Keichousaurus sp., the protorosaur Dinocephalosaurus orientalis Li, 2003, and the ichthyopterygian Mixosaurus panxianensis Jiang et al., 2006. In this bed, reptilian taxa characterized by suction feeding appeared, and most are less than 1 m long. This bed corresponds to a period of decreasing water depth. 相似文献
16.
海南岛大岭地区二叠系的发现及意义 总被引：4，自引：0，他引：4
测制大岭农场１４—１２队剖面时,在覆于相当昌江鸡实含Ｐｓｅｕｄｏｕｒａｌｉｎｉａ带岩关阶地层之上的千枚岩中,首次发现菊石Ａｌｔｕｄｏｃｅｒａｓｓｐ．、Ａｇａｔｈｉｃｅｒａｓｃｆ．ｖｕｌｇａｔｕｍ;河叉岭剖面首次发现牙形刺Ｎｅｏｇｏｎｄｏｌｅｌａ？ｓｐ．;在邦溪农场八队绢云母千枚岩中,第一次分析出以三缝孢子占优势的孢粉组合。据此,笔者认为大岭地区的晚古生代地层,除有下石炭统岩关阶地层外,还有二叠纪地层,并可与邻区二叠纪地层对比,并探讨了该区二叠纪岩相古地理。 相似文献
17.
TONG Haowen 《《地质学报》英文版》2014,88(5):1397-1408
The recently discovered macaque fossils, including isolated teeth and mandible fragments, from Tianyuan Cave and the juvenile maxilla from Wanglaopu Cave near Zhoukoudian can be identified as Macaca mulatta; they represent the first recognized occurrence of fossil M. mulatta in the far north of China. Some previously unearthed but still unpublished Macaca specimens were also studied, including a cranium and the associated mandible from CKT Loc.13A, a maxilla and a mandible from Loc.1, a mandible from Loc.4, and a maxilla from Loc.20, as well as a mandible with complete toothrow from Zhoukoudian but without locality details, all of them can be referred to M. robusta. The study shows M. robusta is more closely related to M. mulatta than to M. anderssonL Zhoukoudian is the richest area of Macacina fossils in North China, totally 2 genera and 4 species were once recognized from 9 localities, namely, Procynocephalus wimani, M. cf. anderssoni, M. robusta and M. mulatta. The fossil records of Macacina in Zhoukoudian area were almost continuous through the Quaternary Period, and it＇s reasonable to assume that Zhoukoudian used to be an evolutionary center for macaques in North China. Therefore, the macaque population of M. mulatta once existed decades ago around Beijing probably originated from the Pleistocene ancestors in the local area, rather than being human-introduced as previously thought. 相似文献
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《Proceedings of the Geologists' Association. Geologists' Association》2023,134(3):251-268
New trilobite material and the first graptolites from outcrop are described from the Am5 member of the Amdeh Formation near Al Fleij in northeast Oman. The sediments in which these faunas occur are interpreted as distal-shelf deposits with storm beds packed with brachiopods and orthoconic nautiloids. The deposits and its faunas are considered of late Darriwilian age and younger than the shallower-water Am5 deposits known from other outcrops. No palynomorphs could be recovered to confirm this due to the increased burial temperature the Al Fleij area has experienced.The trilobites are of considerable palaeo-biogeographic interest as few faunas of this age are known from the Arabian Plate, though their preservation precludes the establishment of new species. They include Isabelinia aff. glabrata, Liomegalaspides sp., Neseuretus tristani, Neseuretinus sp. and the deeper-water forms, Cyclopyge cf. C. bohemica, Arthrorhachis sp. and Brachypleura sp. The graptolites are pendent Didymograptus spp. of later Darriwilian type.Rare elements of the conodonts Nordiora, Amorphognathus and Microzarkodina have been recovered from shell beds that occur interbedded with the faunas. They too indicate a late Darriwilian age and differ from richer, restricted, shallow-water faunas known from the Am5 at other locations, and the more cosmopolitan shelf fauna from the Ayim Member of the Rann Formation of the United Arab Emirates.A coarser, 80 m-thick, terrestrial sequence containing igneous pebbles, included in the Am5 in the 1980s, is shown from the occurrence of fossil plants to be of Permian age and probably equivalent to the Basal Saiq Clastics of Jabal al Akhdar. 相似文献