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1.
《Geobios》2018,51(6):559-570
The outcrops of the Xiangshan Group have been studied since the beginning of the twentieth century, yielding a rich macroflora (the Xiangshan Flora), mainly from the lower part of the Xiangshan Group (South Xiangshan Formation). Nevertheless, no palynological data have been published so far from the South Xiangshan Formation. The present study provides the first palynostratigraphic data of the South Xiangshan Formation. More than 50 fossil taxa from 30 fossil genera have been identified, allowing for a more accurate dating. The most characteristic taxa are Polycingulatisporites triangularis, Quadraeculina anellaeformis, Manumia delcourtii, Ischyosporites variegatus, Callialasporites turbatus, C. trilobatus, C. minus, and Sestrosporites pseudoalveolatus, suggesting a late Toarcian-late Aalenian age for the South Xiangshan Formation. These results are consistent with previous studies suggesting a middle-late Early Jurassic age for this formation; consequently, the most probable age for the South Xiangshan Formation is late Toarcian (late Early Jurassic). 相似文献
2.
ARNAUD BRAYARD HUGO BUCHER THOMAS BRÜHWILER THOMAS GALFETTI NICOLAS GOUDEMAND KUANG GUODUN GILLES ESCARGUEL JIM JENKS 《Lethaia: An International Journal of Palaeontology and Stratigraphy》2007,40(2):175-181
Based on new, bed-rock controlled material from northwestern Guangxi and Oman, the Early Triassic genus Proharpoceras Chao is shown to be a representative of Otocerataceae. Character analysis excludes a direct link with the Griesbachian Otoceratidae and favours a derivation of Proharpoceras from the late Permian Anderssonoceratidae. The biostratigraphic range of Proharpoceras is restricted to the Smithian and its biogeographic distribution comprises Oman, South China, and Primorye, thus indicating an essentially low palaeolatitudinal distribution. Proharpoceras has no apparent relatives among other Early and Middle Triassic Ceratitida and is thus considered to be the last representative of Otocerataceae. This offshoot of the late Permian Anderssonoceratidae implies that an additional ammonoid lineage survived the end Permian extinction and that it dwindled away for some 2 Myr before going extinct. 相似文献
3.
Meng Fan-song 《植物学报(英文版)》1984,26(1)
Coniopteris magnifica sp. nov., Ctenophyllum chenyuanense sp. nov., C. laxilobum sp. nov., Mironeura dakengensis Zhou, are derived from the Xiangxi Formation (s.s.), Western Hubei. According to the aspect and characteristic of the Xiangxi flora, author considers the Xiangxi Formation as Early Jurassic in age. In this paper, the relative problem between the coal-bearing and the fossil plants is briefly discussed also. 相似文献
4.
河南东南部早石炭世植物群 总被引：4，自引：0，他引：4
研究了河南东南部商城和固始杨山组植物化石,共计１１ 属１８ 种。它们分属于石松纲、楔叶纲、真蕨纲、种子蕨纲、科达纲和裸子植物种子,其中以石松纲鳞木类植物占优势。杨山组植物群含有一些典型的早石炭世分子, 如 Ａｒｃｈａｅｏｃａｌａｍ ｉｔｅｓ ｓｃｒｏｂｉｃｕｌａｔｕｓ、Ｃａｒｄｉｏｐｔｅｒｉｄｉｕｍ ｓｐｅｔｓｂｅｒｇｅｎｓｅ、Ｒｈｏｄｅｏｐｔｅｒｉｄｉｕｍｈｓｉａｎｇｈｓｉａｎｇｅｎｓｅ,它们在维宪期至纳缪尔早期地层是颇为常见的;然而这一植物群也含有某些华夏型的鳞木类植物,即Ｌｅｐｉｄｏｄｅｎｄｒｏｎ ｃｆ．ａｏｌｕｎｇｐｙｌｕｋｅｎｓｅ、Ｌ．ｓｈａｎｙａｎｇｅｎｓｅ、Ｌ．ｃｆ．ｓｕｂｒｈｏｍ ｂｉｃｕｍ 等。根据植物群的总体组成,杨山组植物群的地质时代属于早石炭世晚期,大致相当于维宪晚期至纳缪尔Ａ期。当前植物群可以与甘肃东部、陕西山阳、华南和马来西亚西部等的一些同期植物群进行对比,对比结果表明与陕西山阳植物群最接近。此外,笔者还讨论了全球早石炭世晚期植物群的分布 相似文献
5.
The fossil plants described and illustrated were collected from the Yangshan Formation in Shangcheng and Gushi districts of southeastern part of Henan Province, namely, Lepidodendron cf. aolungpylukense Sze, L. shanyangense Wu et He, L. . cf. subrhombicum Gu et Zhi, L. sp. a, L. sp. b, Bothrodendron sp. a, B. sp. b, Lepidostrobus ? sp., Stigmaria ficoides (Sternberg) Brongniart, Archaeocalamites scrobiculatus (Schlotheim) Seward, Cardiopteridium spetsbergense Nathorst, Triph yllopteris ? sp., Rhodeopteridium hsianghsiangense (Sze) Zhang, Zhao et Wu, Paripteris cf. pseudogigantea (Potonie) Gothan, P. ? sp., Cordaites schenkii Halle, Cardiocarpus cordai (Geinitz) Gu et Zhi and Carpolithus sp., including 18 species in 11 genera. They belonged to Lycopsida, Sphenopsida, Filices, Pteridospermopsida, Cordaitopsida and Semina Gymnospermarum respectively , in which Lepidophytic plants of Lycopsida were the dominanance. The Yangshan Formation flora contains some typical Early Carboniferous elements, such as Archaeocalamites scrobiculatus, Cardiopteridium spetsbergense and Rhodeopteridium hsianghsiangense, which were fairly common from Visean to early Namurian; however, it also includes certain lepidophytic plants of the Cathaysian type, such as Lepidodendron cf. aolungpylukense, L. shanyangense and L. cf. subrhombicum, etc. On the basis of the floral composition, the geological age of the Yangshan Formation flora belonged to the late Early Carboniferous epoch, corresponding approximately to late Visean to early Namurian A. The present flora could be compared with contemporaneous floras from eastern Gansu, Shanyang of Shaanxi, South China and western Malaysia, which was closest to the Shanyang flora. In addition, the authors also discussed the distribution of late Early Carboniferous floras in other parts of the world. 相似文献
6.
系统描述了扬山组植物18属25种,其中以石松类及种子蕨和真蕨纲为主,仅少数属楔叶纲;石松类中发现不少叶座较小,叶痕相对较大的鳞木类植物,颇似华夏植物群中的鳞木类;首次报道了我国发现的古芦木孢囊穗.据对植物群综合分析,杨山组的时代为早石炭世中晚期. 相似文献
7.
Pavel P. Skutschas Valentina D. Markova Elizaveta A. Boitsova Sergey V. Leshchinskiy Stepan V. Ivantsov Evgeny N. Maschenko 《Historical Biology》2019,31(7):836-844
The Lower Cretaceous Ilek Formation in Western Siberia (Russia) has yielded various vertebrate fossils, including skeletal remains of dinosaurs. Here we report on a fragmentary theropod egg from the vertebrate locality Shestakovo 3 of the Ilek Formation in Kemerovo Province. We assign the specimen to the oogenus Prismatoolithus (oofamily Prismatoolithidae) as Prismatoolithus ilekensis oosp. nov., on the basis of the following unique combination of characters: ovoid-shaped egg; thin eggshell 300–330 μm thick; angustiprismatic morphotype; eggshell with three different layers; gradual transition between mammillary layer and prismatic layer; abrupt contact between prismatic layer and external layer; mammillary layer to prismatic layer to external layer thickness ratio is 1:3:0.6; prismatic layer with ill-defined squamatic texture; angusticanaliculate pore system; and smooth outer surface. Like other Early Creataceous Prismatoolithus, the egg of Prismatoolithus ilekensis oosp. nov. was laid by a small bodied theropod dinosaur (troodontid or primitive bird) and this taxonomic attribution is supported by results of our phylogenetic analysis. Prismatoolithus ilekensis oosp. nov. is the first Early Cretaceous ootaxon from Russia.
urn:lsid:zoobank.org:act:734EAD40-86C3-488B-A61E-B5FF7378BC0E 相似文献
8.
通过对新疆克拉玛依地区吐孜阿克内沟剖面三工河组孢粉组合的研究,共鉴定孢粉２３属３２种,藻类化石２属４种,命名为Ｄｉｓａｃｃｉａｔｒｉｌｅｔｉ－Ｍｏｎｏｃｏｌｐａｔｅｓ－Ｃｙａｔｈｉｄｉｔｅｓ组合（简称ＤＭＣ组合）。描述了５种花粉Ａｂｉｅｔｉｎｅａｅｐｏｌｌｅｎｉｔｅｓ ｄｕｎｒｏｂｉｎｅｎｓｉｓ Ｃｏｕｐｅｒ,Ｐｓｅｕｄｏｐｉｃｅａ ｍｏｎｓｔｒｕｏｓａ Ｂｏｌｃｈ．,Ｐｏｄｏｃａｒｐｉｄｉｔｅｓ 相似文献
9.
Abstract. In ecosystems where environments are extreme, such as deserts, adult plant species may facilitate the establishment and growth of seedlings and juveniles. Because high temperatures and evaporative demand characterize tall‐grass prairies of the central United States (relative to forests), we predicted that the grassland‐forest ecotone, by minimizing temperature extremes and moderating water stress, may function to facilitate the expansion of Quercus species into undisturbed tall‐grass prairie. We assessed the carbon and water relations of juvenile Quercus macrocarpa and Q. muhlenbergii, the dominant tree species in gallery forests of northeast Kansas, in ecotone and prairie sites. To evaluate the potentially competitive effects of neighboring herbaceous biomass on these oaks, juveniles (< 0.5 m tall) of both species also were subjected to either: (1) removal of surrounding above‐ground herbaceous biomass, or (2) control (prairie community intact) treatments. Herbaceous biomass removal had no significant effect on gas exchange or water relations in these oak species in either the prairie or the ecotone environment. Although the ecotone did alleviate some environmental extremes, photosynthetic rates and stomatal conductance were ca. 20 % higher (p < 0.05) in both oaks in prairie sites vs. the ecotone. Moreover, although leaf temperatures on average were higher in oaks in the prairie, high leaf temperatures in the ecotone had a greater negative effect on photosynthesis. These data suggest that the grassland‐forest ecotone did not facilitate the growth of Quercus juveniles expanding into this grassland. Moreover, the carbon and water relations of juvenile oaks in the prairie appeared to be unaffected by the presence of the dominant C4 grasses. 相似文献
10.
目前中国早期分化的蜥脚型类恐龙化石主要发现于云南省禄丰市早侏罗世地层。本文描述的是一件产自禄丰川街盆地禄丰组的早期分化蜥脚型类恐龙新材料, 包括较完整的颈椎、背椎以及破碎的肩胛骨、耻骨和脚趾骨骼。本文对其进行了详细的骨骼形态学描述, 并与其他早期分化蜥脚型类进行了对比。结果表明, 在禄丰组发现的所有早期分化蜥脚型类中, 该标本与禄丰龙(Lufengosaurus)在形态上相似程度较高。系统发育分析结果显示, 该标本与Coloradisaurus和Glacialisaurus构成一个多分支, 该分支又和禄丰龙一起被归入大椎龙科。由于颈椎和背椎的椎体与椎弓未完全愈合, 推测该标本的个体发育阶段为幼年—亚成年。该标本的发现提高了大椎龙科在亚洲的属种分异度, 进一步扩充了对禄丰早侏罗世恐龙动物群的认识。 相似文献
11.
冀辽一带的土城子组和大北沟组对中国北方侏罗系-白垩系划分对比具有重要的意义.关于它们的时代目前还存在不同的看法,相关的孢粉地层学研究也比较粗略.本文研究了冀北滦平县井上村三岔子剖面土城子组和大北沟组的孢粉组合,共观察统计到50属28种及若干未定种.土城子组Classopollis-Cooksonites-Ephedri... 相似文献
12.
目前中国早期分化的蜥脚型类恐龙化石主要发现于云南省禄丰市早侏罗世地层。本文描述的是一件产自禄丰川街盆地禄丰组的早期分化蜥脚型类恐龙新材料, 包括较完整的颈椎、背椎以及破碎的肩胛骨、耻骨和脚趾骨骼。本文对其进行了详细的骨骼形态学描述, 并与其他早期分化蜥脚型类进行了对比。结果表明, 在禄丰组发现的所有早期分化蜥脚型类中, 该标本与禄丰龙(Lufengosaurus)在形态上相似程度较高。系统发育分析结果显示, 该标本与Coloradisaurus和Glacialisaurus构成一个多分支, 该分支又和禄丰龙一起被归入大椎龙科。由于颈椎和背椎的椎体与椎弓未完全愈合, 推测该标本的个体发育阶段为幼年—亚成年。该标本的发现提高了大椎龙科在亚洲的属种分异度, 进一步扩充了对禄丰早侏罗世恐龙动物群的认识。 相似文献
13.
记述了四川会理下侏罗统益门组的蜥脚类化石。经研究,将化石归于马门溪龙科,建立新属新种何氏通安龙Tonganosaurus hei gen.et sp.nov.。通安龙具有进步蜥脚类的特点:颈椎细长、荐前椎发育侧凹、前肢较长,为后肢的0.80等;同时,通安龙也具有原始蜥脚类的特点:脊椎骨组织坚实不中空、肱骨和股骨骨干粗而圆。从国内外已有的资料看,原始蜥脚类主要发现于侏罗纪早期,而进步蜥脚类则主要发现于侏罗纪中晚期。由于通安龙兼具原始蜥脚类和进步蜥脚类的特点,且时代为早侏罗世,因此,通安龙化石材料的发现对中国西南地区早期蜥脚类的系统演化研究具有重要的意义。 相似文献
14.
本文描述了产自华南贵州下奥陶统红花园组(桐梓红花园标准剖面,沿河甘溪剖面和贵阳黄花冲剖面)的四个镰箭类牙形刺种:Drepanoistodus sp.cf.nowlani,Paltodus sp.cf.P.subaequalis,Paltodus sp.A和Paroisto-dus sp.。D.sp.cf.nowlani为红花园组常见种,但另三种则相对稀少。在红花园组标准剖面,Paltodus sp.cf.P.subaequalis最低出现于该组底部,证实此层位为晚特马豆克期。文中详细图示了产于瑞典下奥陶统的两个带化石种:Paltodus deltifer和Paroistodus proteus,以及瑞典镰箭刺属的三个常见种:Drepanoistodus forceps,D.basiovalis和D.sp.cf.D.suberectus。通过与瑞典材料的详细对比,我们认为华南以前关于P.proteus和P.deltifer两种的记述多有误,须重新厘定。 相似文献
15.
G. J. Keighery 《Plant Systematics and Evolution》1980,135(3-4):171-176
At least 560 species of flowering plants distributed in 64 genera and 16 families native to Southern Western Australia are pollinated by birds. This represents 15% of the total flora, and indicates adaptation to bird pollination is a major evolutionary force in this region. 相似文献
16.
《Palaeoworld》2019,28(3):320-333
The Lower Triassic Osawa Formation in the South Kitakami Belt, Northeast Japan, consisting mostly of mudstone of shallow-marine environment, was deposited during the late Olenekian (ca. 250 Ma), and is an important unit through which to examine the biotic recovery process after the end-Permian mass extinction. The Osawa Formation is the only unit in Japan that yields thylacocephalans (Arthropoda). Three species belonging to three genera have been reported before: Ankitokazocaris bandoi, Kitakamicaris utatsuensis and Ostenocaris sp. In addition to the known species, some thylacocephalans, including one new genus and three new species, are described in the present paper: Ankitokazocaris tatensis n. sp., Concavicaris parva n. sp., Miyagicaris costata n. gen. n. sp. and Ostenocaris? sp. Although Thylacocephala have a rather long stratigraphic range (from Silurian to Cretaceous) and are known from a wide geographical region, there are only about thirty genera in this group. The Osawa thylacocephalan fauna comprises at least five genera, making it one of the most diverse in the world at the generic level. During the Triassic Period, the Thylacocephala diversified and spread widely throughout low-latitude regions. 相似文献
17.
对床板珊瑚化石群的分析表明,南天山阿尔皮什表布拉克组的地质时代为早泥盆世早期,所含珊瑚群与滇西北,西秦岭,内蒙古达尔罕茂明安联合旗,吉林二道沟的珊瑚群面貌相似,明确属于古特提斯生物地理区内,而与北天山,淮噶尔,北山,大,小兴安岭等地区同期地层所产者存在明显差异。 相似文献
18.
N. V. Gordenko 《Paleontological Journal》2007,41(3):319-326
A new species, Oswaldheeria eximia sp. nov., was discovered in the Bathonian continental deposits of an open-cast mine of Mikhailovskii Rudnik Mines, near the town of Zheleznogorsk in the Kursk Region. This is the first record of Oswaldheeria Bose et Manum from European Russia. The leaf anatomy of Oswaldheeria, reconstructed for the first time based on material of unique preservation, has shown that members of this genus were not closely related either to the Ginkgoales or to modern Sciadopitys Siebold et Zucc. 相似文献
19.
20.
N. Yu. Bragin 《Paleontological Journal》2009,43(4):356-369
When studying Late Jurassic-Early Cretaceous radiolarians from the Nordvik section (Arctic Siberia), unique morphotypes of multicyrtoid nassellarians with many horns in the apical part of the shell, which continue the rays A, V, 2l, D, and 2L of the cephalic spicule, were recorded. These morphotypes are assigned to a new family, Echinocampidae fam. nov., including three new genera (Echinocampe gen. nov., Nordvikella gen. nov., and Arctocapsula gen. nov.) and eight new species. The family Echinocampidae was probably restricted to high latitudes and belonged to the boreal fauna of the terminal Jurassic and the basal Cretaceous. 相似文献