共查询到20条相似文献，搜索用时 0 毫秒
1.
湖北安陆新的恐龙蛋类型的发现及其意义 总被引：3，自引：1，他引：3
本文记述的恐龙蛋化石标本,采自湖北省江汉盆地公安寨组下部.蛋化石保存完好.在普通光学显微镜和扫描电镜下观察,蛋壳的显微结构完整,清晰可见.根据钙质蛋壳基本结构单位的形态及排列特征,笔者建立了—新属,新种——Dendroolithus wangdianensis gen. et sp. nov.,代表恐龙蛋类一个新科——Dendroolithidae fam. nov.此外,残存的卵壳膜纤维化石的发现,将为进一步研究恐龙蛋卵壳膜的结构和氨基酸组成提供宝贵材料. 相似文献
2.
3.
浙江天台盆地晚白垩世网形蛋类新类型及网形蛋类的分类订正(英文) 总被引：3，自引：1，他引：3
记述了产自浙江省天台盆地的网形蛋类新材料,建立一新蛋属——拟网形蛋属(Paradictyoo lithusoogen.nov.),两个新蛋种:庒前拟网形蛋(Paradictyoolithus zhuangqianensis oogen.etoosp.nov.)和下西山拟网形蛋(P.xiaxishanensis oogen.et oosp.nov.)。在此基础上,重新系统描述其他已知4种网形蛋属成员的结构特征,并对网形蛋类的分类进行了订正:网形蛋属(Dictyoolithus)仅保留红坡网形蛋(D.hongpoensis Zhao,1994)一个蛋种;建立一新蛋属:原网形蛋属(Protodictyoolithus oogen.nov.),将发现于河南西峡盆地的内乡网形蛋(D.neixiangensis Zhao,1994)和发现于山东莱阳盆地的蒋氏网形蛋(D.jiangi Liu&Zhao,2004)分别修订为:内乡原网形蛋(修订种)(Protodictyoolithus neixiangensis(Zhao,1994)comb.nov.)和蒋氏原网形蛋(修订种)(P.jiangi(Liu&Zhao,2004)comb.nov.);此外,发现于吉林公主岭早白垩世的公主岭网形蛋(D.gongzhulingensis Wang et al.,2006)并不属于网形蛋类,而应归入似蜂窝蛋类(Similifaveoolithus),将其修订为公主岭似蜂窝蛋(修订种)(Similifaveoolithus gongzhulingensis(Wangetal.2006)comb.nov.)。 相似文献
4.
广东省南雄盆地白垩系—第三系交界恐龙绝灭问题 总被引：35，自引：6，他引：35
广东省南雄盆地中的红层可划分为三个群五个组,大致代表了晚白垩世—始新世的沉积.根据绝对年龄、古地磁测定结果和脊椎动物化石组合性质的综合分析,位于地磁极性带 29R 上部的坪岭组和上湖组之间的分界线被确定为 K/T 界线.对晚白垩世恐龙蛋的研究表明,不同\"种\"的恐龙蛋是在地磁极性带 29R 的中、下部,也就是说在白垩系—第三系交界之前20～30万年期间绝迹的.而且在这一时期内,所有已发现的蛋壳中,绝大多数蛋壳的厚度和显微结构都显示出明显的病理特征,例如根据随机取样统计,Macroolithus yaotunensis 蛋壳异常结构的出现率,最高可达75%.产生病态恐龙蛋壳的生理机制可以根据发生在现生鸟类的相同病理特征来解释.进一步分析恐龙蛋壳的微量元素和稳定同位素组成,结果显示, Pb, Cu, Mn 等9种元素丰度变化在这一时期达到最大峰值, δ~(18)O 也出现正异常.在这一基础上提出,微量元素的污染和气候突然的变化妨碍了正常蛋壳结构的形成,导致了恐龙的绝灭.这一绝灭过程大约经历了20～30万年. 相似文献
5.
Qing He Shukang Zhang Lida Xing Qin Jiang Xiaoli Wang Zhenghua Pan 《Historical Biology》2019,31(2):168-176
Well-preserved dinosaur eggs from the Cretaceous Huizhou Formation in the Xiuning Basin, Anhui Province, China, are analysed in this paper. We describe a new oospecies, Similifaveoloolithus qiyunshanensis, based on several distinct characters of external morphology, size, eggshell thickness, and internal microstructure. Radial sections of this new oospecies show branched eggshell units with a fused layer near the outer surface, while numerous irregular pores and cones constitute a honeycomb pattern in tangential sections. The discovery of S. qiyunshanensis expands the distribution of Similifaveoloolithidae dinosaur eggs in China and provides new fossils for researching dinosaur eggshell formation mechanisms which are different from those of the currently known oofamilies. The dinosaur-egg-bearing strata in the Huizhou Formation have been dated to the early Late Cretaceous (Cenomanian-Turonian) on the basis of a similar dinosaur egg assemblage in the Tiantai Basin in Zhejiang Province. The eggs described in this paper are thought to have been laid in a buried nest while enrichment of trace elements in eggshells may have been caused by their ingestion into the body of the dinosaur producer. We suggest that the paleoclimate of this habitat was semi-arid to arid and that this environment was favourable for the preservation of eggs.http://zoobank.org/LSIDurn:lsid:zoobank.org:pub:9D63A51F-5A4B-4249-901D-42A33E9FA933 相似文献
6.
Gerard D. Gierliński 《Ichnos》2015,22(3-4):220-226
The Late Cretaceous track assemblage of southeastern Poland includes intriguing ichnotaxa with Asian or North American affinities. New finds of the ceratopsian-like ichnite and small hadrosauroid track refer directly to this problem, whereas the re-evaluation of foraminifer taxa estimates the stratigraphic positions of the track-bearing horizon and allowed to understand paleogeographic context of the studied and adjacent areas. The results demonstrate that during the Late Cretaceous times, migration of dinosaurs was possible from Asia through the East European Land to Kukeritz Island and the islands at peri-Tethys area. 相似文献
7.
Julio Company 《Historical Biology》2019,31(2):203-210
Fieldwork carried out recently in the southeastern branch of the Iberian Range (Valencia Province, Spain) has led to the collection of a large volume of dinosaur eggshell fragments of unusual thickness. These specimens, up to 4.9 mm thick, were recovered from palustrine grey marls of the upper Campanian-lower Maastrichtian Sierra Perenchiza Formation, which comprises a wetland paleoenvironment deposit. These eggshell fragments have a characteristic compactituberculate ornamentation, dinosauroid-spherulitic organisation, and exhibit a complex canaliculate respiratory system. The external tuberculate surface of the shell as well as the internal microstructure enable referral to Megaloolithus aff. siruguei, the most common megaloolithid oospecies known from the Iberian Peninsula and southern France. The biostratigraphic range of M. siruguei matches the temporal distribution of titanosaurid dinosaurs across the Iberian Range, tentatively considered to be potential producers. 相似文献
8.
河南淅川盆地的恐龙蛋 总被引：4，自引：2，他引：4
记述了河南淅川盆地10个地点发现的恐龙蛋化石计6种,分属于4个科6个属．其中新属1个、新种2个。新属、新种滔河扁圆蛋（Placoolithustaohensis）以其特有的壳单元分枝特征成为树枝蛋科的新型分子;另一新种渐川树枝蛋（Dendroolithusxichuanensis）与湖北安陆王店树枝蛋（D．wandianensis）性质相似,两者时代应彼此相当;含滔河扁圆蛋的马家村组下部应与其下含淅川树枝蛋的高沟组划归同一时段为宜,即晚白垩世早期;含副圆形蛋、椭圆形蛋、长形蛋、南雄蛋的马家村组中、上部和其上的寺沟组,时代应属晚白垩世中、晚期。 相似文献
9.
An isolated, large recurved and finely serrated tooth found associated with the prosauropodEuskelosaurus from the Late Triassic part of the Elliot Formation is described here. It is compared to the Triassic thecodonts and carnivorous
dinosaurs and its possible affinity is discussed. The tooth possibly belongs to a basal theropod and shows some features similar
to the allosauroids. This tooth is of significance, as dinosaur remains except for some footprints and trackways, are poorly
known in the Late Triassic horizons of southern Africa. 相似文献
10.
广东南雄盆地南雄群的介形类动物群 总被引：1，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
11.
记述了江西省上高县发现的一窝不完整蛋窝的恐龙蛋。根据恐龙蛋宏观形态和蛋壳显微结构特征将其归入石嘴湾珊瑚蛋(Coralloidoolithus shizuiwanensis)。该窝恐龙蛋为近圆形球体,平均长径11.8 cm,平均赤道直径9.8 cm,蛋壳厚度可达2.5 mm;蛋壳由锥体层与柱状层组成,锥体层较薄,柱状层可分为内层、中间层和外层,内层发育致密的水平生长纹,中间层结构松散,含有大量暗色物质,中间层和外层发育次生壳单元。依据新标本的观察,明确珊瑚蛋属在石笋蛋科中以柱状层中间层结构松散为主要分类特征。上高新标本的发现,丰富了石嘴湾珊瑚蛋的古地理分布,同时也为上高地区晚白垩世含恐龙蛋红层的对比提供了新的证据。 相似文献
12.
Abstract: We describe bones from the Late Cretaceous of Alberta – including bones of large dinosaurs, a femur from the aquatic reptile Champsosaurus, and a dentary from the marsupial Eodelphis– that bear tooth marks made by animals with opposing pairs of teeth. Of the animals known from the Late Cretaceous of North America, only mammals are capable of making such tooth marks. In particular, multituberculates, which have paired upper and lower incisors, are the most likely candidates for the makers of these traces. The traces described here represent the oldest known mammalian tooth marks. Although it is possible that some of these tooth marks represent feeding traces, the tooth marks often penetrate deep into the dense cortices of the bone. This raises the possibility that, much as extant mammals gnaw bone and antler, some Cretaceous mammals may have consumed the bones of dinosaurs and other vertebrates as a source of minerals. However, none of the tooth marks described here resemble the extensive gnaw traces produced by Cenozoic multituberculates or rodents. This suggests that specialized gnawing forms may have been rare or absent in the Late Cretaceous of North America. 相似文献
13.
记中国南方广东省南雄盆地晚白垩世一新的窃蛋龙类化石 总被引：1，自引：0，他引：1
文中记述的窃蛋龙类一新属新种：遗忘始兴龙Shixinggia oblita gen.et sp.nov.是由北京自然博物馆于1995年采自中国广东省南雄盆地的始兴县。它具有以下特征：相对短的肠骨前突,肠骨高度与长度之比率大,并且肠骨的前突及后突的腹边缘均高于髋臼的背边缘。遗忘始兴龙还显示另一特征为股骨近端转子嵴内表面具有一大的气孔,胫骨近端也有类似的相对小的孔,而这些孔在其他已知的窃蛋龙类中均没有报道。这是继2003年报道的黄氏河源龙之后,中国南方第二个新的窃蛋龙类化石。 相似文献
14.
本文研究吉林省延吉盆地下白垩统2个组中沟鞭藻类及其它藻类组合。其中铜佛寺组二段是延吉盆地下白垩统产沟鞭藻最丰富的层位。Vesperopsis cf．zhaodongensis-Vesperopsis tongfosiensis组合指示的地质时代可能为Hauterivian—Barremian期,代表了淡水-微咸水(偏淡水)的沉积环境,而Filisphaeridium-Sentusidinium组合的时代属于Barremian—Aptian早期,指示的水体环境为淡水-微咸水(偏微咸水)。文中描述了1新种,对Vesperopsis yanjiensis Mao,Wan et Qiao,1999进行了修订。 相似文献
15.
16.
记述了发现在广东南雄晚古新世地层中的北柱兽目和钝脚目各一新种———中间沟柱兽 (Bothriostylopsmediussp .nov .)和大塘南岭兽 (Nanlingilambdadatangensissp .nov.)。中间沟柱兽的个体大小介于南方种 (B .notios)和进步种 (B .progressus)之间 ,但M3尤其是m3相对上述两种更大。大塘南岭兽比池江南岭兽 (N .chijiangensis)个体小、下颊齿跟座窄小、下后尖比下前尖高大。 相似文献
17.
《Ichnos》2012,19(1-2):43-49
Cretaceous bird tracks assigned to the ichnogenera Aquatilavipes and Koreanaornis are reported for the first time from Sado Island in the Yeosu Island archipelago, Korea, an area already known for multiple dinosaur track-bearing horizons. The Koreanaornis tracks are associated with many small Cochlichnus trails attributed to nematode worms, on which the birds were likely feeding in a lake shoreline environment. The Koreanaornis and Aquatilavipes assemblages occur at different, albeit close, stratigraphic levels. The Aquatilavipes report is the first from Korea. 相似文献
18.
Until now dinosaur tracks from Switzerland were only known from Triassic and Late Jurassic strata. We report here for the first time the occurrence of ornithopod tracks from the Schrattenkalk Formation (Late Aptian) from the Swiss Central Alps. The locality is situated in an abandoned quarry on the shore of Lake Lucerne close to the village of Beckenried. The steeply inclined surface has more than 50 tracks (in three trackways) of ornithopod dinosaurs that are attributed to iguanodontids. Three trackways can be followed for distances of 25 to 35 m. The lengths the footprints (mean: 30 cm) point to animals ranging in size of from 4 to 6 m, with estimated hip heights between 1.8 and 2 m (hip height 6 FL) and 1.4 to 1.7 m (hip height 5 FL). One of the trackways shows two succesive manus impressions, indicating facultative quadrupedal gait. The track bearing layer consists of shallow water micrites with traces of emersion, and it is overlain by bioclastic grainstones. Previously the Upper Schrattenkalk Member in the Helvetic realm was thought to have formed on a large shelf far away from any continents. The present discovery will shed new light on the paleogeographic position of the Helvetic nappes. 相似文献
19.
20.
中国白垩纪蜂窝蛋化石的分类订正 总被引：3，自引：0，他引：3
重新系统描述了蜂窝蛋科蜂窝蛋属的模式蛋种宁夏蜂窝蛋(Faveoloolithus ningxiaensis)和杨氏蛋属的模式蛋种夏馆杨氏蛋(Youngoolithus xiaguanensis),并记述了产自浙江天台的蜂窝蛋科新材料,建立一个新的蛋属———副蜂窝蛋属(Parafaveoloolithus),及3个新的蛋种———Parafaveoloolithus microporus,P.macroporus和P.tiansicunensis。根据赵资奎1994年提出的恐龙蛋分类中具有鉴定意义的几个特征,重新讨论了现有蜂窝蛋的分类地位,提出杨氏蛋属应当提升为科一级的分类单元,总结了蜂窝蛋科内属级和种级分类单元的主要鉴定特征以及蜂窝蛋类的鉴定方法。 相似文献