共查询到20条相似文献，搜索用时 171 毫秒
1.
湖南花垣县杨二洞化石点位于沅江上游,动物群种类包括有6目26种,动物群时代为晚更新世末期。杨二洞小型哺乳动物化石材料较多。有些小型哺乳动物在我国更新世时期首次发现,如大爪长尾鼩、大黑伏翼、大齿鼠等。杨二洞动物群在我国西南地区更新世末期的材料之中,具有较为突出的森林性特征,反映出湘西北更新世末期具有南亚热带森林古环境。动物群综合研究发现,小家鼠、褐家鼠在中更新世晚期分别产生于中国东北和长江下游,其中小家鼠在更新世晚期经华北向长江流域及其以南扩散,褐家鼠在更新世较晚时期分别向华北和岭南扩散。晚更新世以来,有较多小哺乳动物出现了从低海拔向高海拔山区进行生境转移的现象,这种生境转移对认识大熊猫生态演变有重要参考。杨二洞堆积物特征反映,沅江上游晚更新世末期时河床侵蚀性下切明显,地貌变化显著。 相似文献
2.
中国北方晚更新世哺乳类动物群的划分及其地理分布 总被引：3，自引：0，他引：3
<正> 新第三纪以来,由于青藏高原、喜马拉雅山脉与西部山脉的隆起,我国形成了西高东低的地形特点,导致了气候和环境的变迁,明显地影响了中国哺乳动物的分布。在晚更新世,中国南北动物群分化逐渐扩大,动物群更替尤为频繁。中国晚更新世地层及动物群的研究已有一段相当长的历史,发现了众多重要的遗址和化石地点,积累了丰富的资料。笔者综合有关资料,对我国北方晚更新世动物群,特别是猛犸象-披毛犀动物群的划分、地 相似文献
3.
4.
临夏盆地的晚新生代沉积中富含哺乳动物化石,以晚渐新世巨犀动物群、中中新世铲齿象动物群、晚中新世三趾马动物群和早更新世真马动物群的化石最为丰富。晚新生代是青藏高原快速隆升的时期,临夏盆地的4个主要哺乳动物群在构造剧烈变化的背景下发生了显著的更替。通过对不同动物群所代表的生态特征的分析,恢复了临夏盆地晚新生代以来的气候环境演变过程:晚渐新世以温暖湿润的森林环境为主,间杂有一些开阔地带;中中新世的森林更加茂密,水体更加丰富;晚中新世演变为炎热半干旱的稀树草原环境,季节性变化加强;早更新世气候寒冷而干燥,并伴有显著的海拔升高。青藏高原在晚渐新世的隆升幅度还不足以阻挡大型哺乳动物在高原南北的交流,但到中中新世已成为明显的障碍,至晚中新世对动物迁徙的阻碍作用更加突出,而临夏盆地在早更新世已经达到相当大的高度,产生了一个高原或高山的动物群 相似文献
5.
第四纪期间中国南北两大动物区系之间的过渡地带动物群 总被引：6，自引：0，他引：6
中国第四纪期间的哺乳动物，可划分为南、北两大动物群，在两大动物群之间，存在过渡地带动物群。过渡地带的动物群，晚更新世的有河南新蔡、安徽五河戚咀及江苏武进；中更新世地点有安徽和县、巢县银山、河南南召及江苏南京汤山；早更新世地点有安徽巢县银山下部堆积、陕西蓝田公王岭及汉中盆地的勉县。裴文中（１９５７）首先提出淮河过渡区的存在，周明镇等认为不存在。事实上过渡地带的南、北混生动物群是存在的，过渡地带的范围大小及地点是随着地史的变迁而不断的变化。四不象鹿是过渡地带生活的一种特殊动物，而众多的古人类化石在过渡地带发现，也是这一地区的一个特色。 相似文献
6.
中国第四纪哺乳动物群的地理分布与划分 总被引：9，自引：2，他引：9
<正> 中国第四纪哺乳动物群的地理分布,根据已故的著名学者裴文中教授(1957年)的意见,划分为四个区域,除了南、北二大区域之外,东北区是北方区的一个侧枝及过渡区——淮河区。近年来,根据周明镇等(1978年)的工作,认为斐文中所指“巨河狸-四不象鹿动物群”是一个在层位上被搞混乱了的概念。所谓巨河狸(即杨氏河狸)产自中新统,而四不象鹿则为更新世化石。作者认为这一搞混的概念,有其历史原因,但裴文中所述的淮河过渡区是客观存在。随着近年来发现地点日渐增多,证明从中更新世开始,就已经有过渡区的动物群存在。例如安徽和县人动物群,就是中更新世期间的过渡动物群,所以在涉 相似文献
7.
北京地区第四纪洞穴地层层序基本上是连续的，包括早更新世灰峪洞组与太平山；事更新世周口店组与新洞组；晚更新世羊耳峪组与山顶洞组。洞穴测年结果清楚，生物群演替明确。既有由北京人、新人、山顶洞伯遗骸与文化不断进步，又有由泥河湾动物群、周口店动物群及山顶洞动物群的不断更新。 相似文献
8.
顾乡屯动物群是由１９３１年尹赞勋先生在哈尔滨顾乡屯发现１９种哺乳动物化石而得名，其后在东北、内蒙古一带多处发现，由于以被毛犀、猛犸象化石最为常见，一般也称为“披毛犀－猛犸象动物群”。到目前为止该动物群至少有６４种化石，分属１８科３７属。顾乡屯组代表东北地区晚更新世河－湖相沉积，与华北萨拉乌苏组有很好的对比性，属同期异地同相沉积。顾乡屯动物群化石层位仅限于顾乡屯组地表出露部分，年龄测定结果不超过６００００─７００００ａＢ．Ｐ．，表明顾乡屯动物群相当于萨拉乌苏上部动物群，时代为晚更新世晚期。顾乡屯动物群与顾乡屯组在时代上的不一致性，是东北地区第四纪研究中应引起重视的问题。对大同第四纪火山群及我国近期火山的分布，自３０年代由尹赞勋先生做了开创和倡导性研究以来，在岩石学、地球化学、树造环境和深部岩浆源及年代学等方面的研究都已取得长足的进展。 相似文献
9.
10.
近年在南岭以南的广东东江流域河源地区东源县上莞镇的碧寿洞中发现较丰富的古哺乳动物牙齿化石。经鉴定为6个目5属5种,称之为碧寿动物群。根据碧寿动物群指示的古生态、化石层位、热释光测试结果和生物地层对比初步认为,该动物群与西江流域的罗沙岩动物群一样,都属于晚更新世时期的大熊猫—剑齿象动物群,生活在MIS5a时的间冰期,但罗沙岩动物群的时代略早,为(79.0±15)kaBP,而碧寿动物群则存在于末次冰期/末次间冰期之交的MIS5a之末叶。此动物群为广东东江流域历年首现,代表了当时的热带北缘森林草原的自然环境。 相似文献
11.
The Rhinocerotidae is one of the most common and important families in the Pleistocene mammalian fauna of South China. Since the last century, most of the Pleistocene rhinocerotid fossils were prematurely assigned to Rhinoceros sinensis, which has resulted in confusion of taxonomy for decades, especially in South China. The Yanjinggou area in Chongqing Municipality of China, where the neotype of R. sinensis came from, has yielded abundant rhinocerotid fossils and is a key area to solve this problem. A recently discovered juvenile skull from a karstic fissure in this area can be referred to Dicerorhinus sumatrensis (Fischer, 1814), which is the first confirmed non-Rhinoceros rhinocerotid from the area. This new finding indicates that non-Rhinoceros fossils might have been mixed in AMNH collection from Yanjinggou and thus the diagnosis of Rhinoceros sinensis needs reformation. On the other hand, Stephanorhinus ?kirchbergensis is also detected in Granger’s collection based on our reobservation. The coexistence of Rhinoceros, Dicerorhinus and Stephanorhinus shows the higher diversity of Pleistocene rhinocerotids in South China. 相似文献
12.
Cheng Jie Tian Mingzhong Cao Boxun Zhao Zhizhong China University Of Geosciences Beijing China University of Geosciences Wuhan Hubei Institute of Geomechanics Chinese Academy of Geological Sciences Beijing Fei Zhenbi 《《地质学报》英文版》1997,71(3):231-243
From 1985 to 1987, four new localities with abundant fossil mammals were dis-covered by Cao, Tian and others in the Zhoukoudian (Choukoutien) area, Beijing. They are theEast, West, Shangdian and Donglingzi caves. The East Cave fauna consists of 28 speices ofmammals and its age is middle Early Pleistocene. The East Cave assemblage shows that a tem-perature-falling event took place at around 1.20 Ma B.P. at Zhoukoudian. Sixteen species ofmammals were collected from the West Cave, which are mainly forms of late Early Pleistoceneage. The West Cave fauna represents a transitional fauna from the East Cave fauna (dry-cold)to the fauna (warm) at locality 9. The Shangdian Cave fauna is composed of four forms, beingMiddle Pleistocene in age. The Donglingzi Cave fauna contains 21 Late Pleistocene forms. Inthe cave two fossil horizons may be distinguished. The age of the lower horizon is early LatePleistocene, which is equivalent to that of the New Cave fauna; while the fauna of the upper ho-rizon may be correlated with the Upper Cave fauna. 相似文献
13.
内蒙古赤峰西北地区的东村、东梁一带更新世早期河-湖相沉积物相当发育,为一套白色砂与棕红色亚粘土互层,其中含有丰富的哺乳动物化石,计11科18属21种。动物群性质与泥河湾(狭义)的相当。这是我国最东和最北的一个三趾马与真马共生的化石地点。 相似文献
14.
Cover sediments of the York Terrace exposed near the California River, western Seward Peninsula, Alaska, yield mollusks, ostracodes, and foraminifera that lived during the Anvilian transgression of early Pleistocene age. The fossiliferous sediments lie at the inner edge of the York Terrace, a deformed wave-cut platform that extends eastward from Bering Strait along much of the southern coast of Seward Peninsula. The seaward margin is truncated by the little-deformed Lost River Terrace, carved during the Pelukian (Sangamonian) transgression. The early Pleistocene sediments seem to have been deposited between the first and second of four glaciations for which evidence can be found in the California River area.The California River fauna includes several extinct species and several species now confined to areas as remote as the northwestern Pacific and north Atlantic. The fauna probably lived in water temperatures much like those of the present time but deeper water on the Bering Shelf is suggested.The presence of an early Pleistocene fauna at the inner edge of the York Terrace at California River shows that the terrace was largely carved before and during early Pleistocene time. However, a marine fauna apparently of middle Pleistocene age is found on the York Terrace near Cassiterite Peak, and this seems to indicate that the terrace remained low until middle Pleistocene time. Uplift of the York Terrace probably was accompanied by uplift of Bering Strait. The strait may have been deeper, and there may have been no land bridge between the Seward Peninsula of Alaksa and the Chukotka Peninsula of Siberia during most of early and middle Pleistocene time. 相似文献
15.
龙担哺乳动物群发现于甘肃省东乡族自治县的早更新世黄土底部。此前我国早更新世的哺乳动物化石大多发现于河-湖相地层中,在黄土中极少发现,而且主要在六盘山以东。在龙担哺乳动物群中还发现了灵长类化石,这在我国西北地区尚属首次。龙担哺乳动物群产于黄土底部约30m的地层中,最低的层位距“底板”(积石组砾岩)仅约3m。化石相当丰富,其中有不少新的种类。目前已发现的化石共21种,大体可以分为3类:1)与泥河湾哺乳动物群相同或很接近的;2)与泥河湾哺乳动物群相比,在进化水平上稍低,因而可能代表较早地质时代的;3)在泥河湾哺乳动物群中没有发现过的。龙担哺乳动物群的地质时代可能比泥河湾者稍早,可能约2MaB.P.。其组成倾向于表明,当时该地区周围还有相当面积的森林覆盖。 相似文献
16.
17.
Svetlana A. Kuzmina Andrei V. Sher Mary E. Edwards James Haile Evgeny V. Yan Anatoly V. Kotov Eske Willerslev 《Quaternary Science Reviews》2011,30(17-18):2091-2106
Chukotka is a key region for understanding both Quaternary environmental history and transcontinental migrations of flora and fauna during the Pleistocene as it lies at the far eastern edge of Asia bordering the Bering Sea. The now submerged land bridge is the least understood region of Beringia yet the most critical to understanding migrations between the Old and New Worlds. The insect fauna of the Main River Ledovy Obryv (Ice Bluff) section, which is late Pleistocene in age (MIS 3-2), is markedly different from coeval faunas of areas further to the west, as it is characterized by very few thermophilous steppe elements. From the fauna we reconstruct a steppe-tundra environment and relatively cold conditions; the reconstructed environment was moister than that of typical steppe-tundra described from further west. The data from this locality, if typical of the Chukotka Peninsula as a whole, may indicate that a barrier associated with the environments of the land bridge restricted trans-Beringian migrations, particularly the more thermophilous and xeric-adapted elements of the Beringian biota, supporting the hypothesis of a cool but moist land-bridge filter inferred from evidence from several other studies. 相似文献
18.
A new genus and species of a microtine rodent, Proneofiber guildayi, is named on the basis of rooted teeth with cement from the warm Gilliland local fauna, Seymour Formation of Pleistocene age, Knox County, Texas. Proneofiber guildayi is considered to be ancestral to Neofiber, the round-tailed water rat, now living in the extreme southeastern United States. The presence of Pleistocene faunas prior to the first continental glaciation and the existence of three Pearlette-like volcanic ashes in the Plains Region suggest a revision of the age assignment of Pleistocene deposits from the nonglaciated region. 相似文献
19.
20.
These data indicate that the last representatives of Hyaenidae on the Oka plateau, i.e., cave hyenas (C. c. spelaea), are direct descendants of the hyenas that lived in the Altai–Sayan and Baikal mountain country from the Late Miocene to the end of the Pleistocene. Their continued existence over a long time undoubtedly indicates the absence of repeated glaciation during the Pleistocene. Cave hyenas are relics of the late Tertiary fauna in the area of Lake Baikal; they became extinct due to gradual cooling, which peaked at the end of the Late Pleistocene. 相似文献