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1.
本文首次描述山东东营凹陷晚更新世海侵层中的沟鞭藻类化石12种含1亚种1比较种和1新种(Dissiliodinium tuberculatum sp.nov.),归属于6属3科;简要介绍了沟鞭藻组合特征。  相似文献   

2.
本文描述了泗洪北部两个晚新生代的地层剖面及其所含脊椎动物,确立了泗洪北部广泛分布的砂砾层的层序和时代.含 "Diceratherium" cf. minus 的重岗山的砂砾层的时代为晚中新世早期,含有 Proboscidipparion、Stegodon orientalis 和 Palaeoloxodon naumanni 等化石的归仁砂砾层的时代则为早更新世.  相似文献   

3.
甘肃榆中晚更新世哺乳动物化石   总被引:2,自引:0,他引:2  
本文记述了甘肃榆中上苦水大沟发现的几种哺乳动物化石:Microtusgregalis,Ochotonasp.,Felistigris,Equusprzewalskii,Coelodontaantiquitatis,Cervus(Sika)sp.,Antilopinaegen.indet.,Ovisnahoor,Bovinaegen.indet..含化石地层的时代应为晚更新世中晚期。这是甘肃中部地区新发现的一个层位确切、化石门类较多的第四纪哺乳动物群。  相似文献   

4.
报道了发现于宝格达乌拉地区的少量古近纪化石材料(包括零碎的牙齿和头后骨骼)。材料产自不整合覆盖在细粒红层之上的河相沉积物,显示出再沉积特点。经鉴定,它们可归入Breviodon minutus,Rhinocerotidae gen.et sp.indet.,Brontotheriidae gen.et sp.indet.及其他未定奇蹄类。材料在时代上确属古近纪无疑,但产出层位的时代尚有疑问。宝格达乌拉地区过去只出产新近纪脊椎动物化石,古近纪的地层和化石都未曾报道。根据新化石点与附近地层的接触关系,我们怀疑这些古近纪化石是后期再沉积在新近纪的宝格达乌拉组中的。新材料的发现提示该地区可能还有更多的古近纪地层。  相似文献   

5.
In the past an ‘explosion’ in diversity and abundance of small shelly fossils and of trace fossils has served to mark the base of the Cambrian. However, no evidence has been presented to prove that the ‘explosions’ of the two groups were synchronous. We describe small shelly fossils and trace fossils from the same phosphatic limestone beds that indicate that the two events were separate in time. The small shelly fossils are Anabarites trisulcatus, Hyolithellus cf. H. isiticus, Microcornus? sp., Protohertzina anabarica, P. unguliformis, P. sp. A, Pseudorthotheca sp. A, Rushtonia? sp. A, four types of tuberculate plates and one type of reticulate plate. These fossils represent a restricted, ‘pre-explosion’ fauna and are assigned to the Anabarites-Circotheca-Protohertzina Assemblage Zone, an uppermost Precambrian zone in the Meishucun Stage, Yunnan Province, China. A point at the top of this zone has received strong international endorsement for future designation as the base of the Cambrian. Associated with the small shelly fossils are the trace fossils Cruziana sp. A, Cruziana? sp. B, Rusophycus sp. A, Palaeophycus rubdark and arthropod scratch marks. If found in isolation, this trace fossil assemblage would be considered as post-Precambrian because it includes large, highly organized arthropod traces that are traditionally accepted as occurring above the trace fossil ‘explosion’. We therefore conclude that the trace fossil ‘explosion’ predates the small shelly fossil ‘explosion’. If the proposed location of the base of the Cambrian in Yunnan is accepted, the small shelly fossil ‘explosion’ concept and its relationship to the boundary would not be greatly modified. The trace fossil ‘explosion’, however, would no longer indicate the base of the Cambrian and the ranges of some trace fossils would be extended into the Precambrian.  相似文献   

6.
贵州关岭晚三叠世法郎组瓦窑段鱼类化石初步观察   总被引:5,自引:0,他引:5  
描述了关岭新铺地区晚三叠世法郎组瓦窑段中发现的鱼类5目5科5属5种和1未定种,其中1新属5新种,它们是Guizhoucoelacanthus guanlingensis Liu,Yin et Wang S Y gen.etsp.nov.,Birgeria guizhouensisLiu,Yin et Luo sp.nov.,Birgeriasp.,Pholidopleurus xiao waensis Liuet Yin sp.nov.,Peltopleurus brachycephalus Liu et Yin sp.nov.,Guizhoueugnathus largusLiu,Yinet Luo sp.nov.。关岭法郎组瓦窑段鱼类组合与邻区兴义晚三叠世法郎组竹杆坡段(卡尼早期)鱼类组合明显不同,瓦窑段的层位在竹杆坡段之上,其时代可能为卡尼中期。  相似文献   

7.
8.
1972年10月,作者在陇东进行第四纪哺乳动物和地层考察期间,在陕西省长武县城关附近的窑头沟及鸭儿沟观察了几个晚更新世地层剖面,并且在这些剖面的中、下部灰色砂质土及砂砾层找到了许多石器和少量哺乳动物化石。此外,还获得了一枚化石智人牙齿。通过这些材料的简单记述(石器材料将另文发表),作者希望对黄土高原晚更新世哺乳动物和地层时代的认识有所帮助。  相似文献   

9.
The group Cnidaria includes 'jellyfish', soft-bodied anemone and anemone-like forms and calcified corals. These diploblastic organisms have a fossil record extending back to the earliest metazoans of the Neoproterozoic; however certain cnidarians of the subclass Zoantharia, characterized by soft-bodied anemone-like forms, are absent or poorly represented in the fossil record. Despite the paucity of fossils, it is thought that calcification by soft anemone-like animals was responsible for producing the skeleton that allowed the preservation of the first corals. We report discovery of an abundant assemblage of in situ soft-bodied polyps with tissues. They are preserved in exquisite detail and come from the well-known Lower Cambrian Chengjiang biota of Yunnan, China. The soft-bodied polyps display a simple anatomy that is comparable to some extant anemones of the order Actinaria. The new fossils are assigned to Archisaccophyllia kunmingensis n. gen. et n. sp. Their simple and conservative form suggests that these fossils may represent some kind of ancestral rootstock. The preserved life assemblage provides a unique snapshot of Lower Cambrian anemone life and provides clues for relationships with extant actiniarians as well as calcified corals.  相似文献   

10.
斋桑盆地自晚白垩世以来即为淡水湖泊环境,其始新世至中新世湖相及湖边缘相沉积物产有丰富的轮藻化石。文中建立三个轮藻化石组合:(1)Harrisichara mitella—Peckisphaera zajsanica组合(中始新世早期);(2)Lychnothamnus formosus—Peckichara组合(中始新世晚期--渐新世早期);(3)Gyrogona aralica—sphaerochara clearus组合(中--晚渐新世)。斋桑盆地轮藻化石出现的最高层位为下中新统且化石稀少,推测系盆地环境日益干旱所致。  相似文献   

11.
本文简记了在四川省炉霍县虾拉沱附近鲜水河左岸发现的十三种哺乳动物化石.根据动物群的性质和 C~(14) 年代的测定,初步确定含化石层的时代为晚更新世最晚期.  相似文献   

12.
A small but diverse fossil flora is described from the Early Permian Taiyuan Formation occurring at the Yangshuling mine in Pingquan district of Hebei Province, northern China. Fossils occur as compression/impressions within mudrocks and fine-grained sandstones and also as carbonate permineralizations within volcaniclastic tuffs. All are fragmentary and contain lycopsids, sphenopsids, ferns and seed plants, and include several new species. In the compression assemblage sphenopsid and pteridosperm foliage accounts for the majority of the fossils recognised with only a few other kinds of plant organs present. In contrast, the permineralized assemblage is dominated by cordaitaleans with a composition similar to that occurring in coal-ball assemblages elsewhere in the Taiyuan Formation. From the taxonomic synthesis presented it is apparent that the Yangshuling permineralized assemblage contains many of the plant taxa diagnostic of the northern realm of the Early Permian Cathaysian flora, and preserves a representative sample of the wetland coal-swamp vegetation of this time. The permineralized assemblage at Yangshuling represents the first example of anatomically preserved plants from volcaniclastic lithologies from the Palaeozoic of China, raising the possibility of similarly preserved plant-fossil assemblages elsewhere in the Cathaysian realm.  相似文献   

13.
东梁峁遗址是山西吉县清水河流域的一处旧石器时代早期遗址。该遗址于2009~2010年发掘,发掘厚度约10~16m,揭露面积约1000m2,出土石制品22件,动物化石2682件。石制品以石英岩、燧石和石英砾石为原料,硬锤直接打击法进行剥片和石器加工,石制品类型有石片、断块和石器,其中石器类型为小型石片石器,包括刮削器和尖状器。动物化石数量多,可鉴定化石种属包括梅氏犀、马、牛、肿骨鹿、野猪、鼠兔、鼢鼠和一些小型食肉类动物,是中国北方中更新世的常见种属,反映了疏林草原的生态环境。黄土地层和动物群对比分析显示,该遗址形成于中更新世早期阶段。该遗址的发现为研究中国北方旧石器时代早期的文化面貌及其分布状况提供了重要资料。  相似文献   

14.
甘肃灵台雷家河新第三纪晚期的大哺乳动物组合及其时代   总被引:4,自引:0,他引:4  
讨论的大哺乳动物化石出自甘肃灵台雷家河村东南小石沟[72074(1)、72074(4)]和文王沟(93002)等地的新第三纪晚期地层。它们包括15种,分属8属、9科、4目,可能代表两个不同时代的组合。第一组合所在的地层层位是72074(4)剖面的L5~L3层和72074(1)剖面的第3层,主要由 Hipparion pater、Acerorhinus sp.、Nyctereutes.、 Hyaeninae gen.et sp.indet.和Gazella niheensis等类型组成,其性质与山西榆社高庄组南庄沟段和醋柳沟段产出的大哺乳动物的接近,时代可能为中上新世。第二组合所在的地层层位是72074(1)剖面的第2层,以Anancus sinensis 和Cervidae gen.et sp.indet.为代表,其性质与榆社麻则沟组动物群的相近,时代为晚上新世。  相似文献   

15.
The data on the plant fossils of the Trout Valley Formation of north-central Maine, U.S.A., are summarized. Evidence from lithological correlation, from plant megafossils and paleopalynology suggest a late Early Devonian (Emsian) age for the Formation. Plant megafossils present are several species of Psilophyton, Pertica quadrifaria, Kaulangiophyton akantha, Prototaxites sp., Drepanophycus sp., Taeniocrada sp. and Thursophyton sp. The microfossil assemblage, through poorly preserved, contains Deltoidospora sp., Apiculiretusispora sp., Emphanisporites rotatus, E. annulatus, Clivosisporites cf. C. verrucata, Grandispora sp. and a chitinozoan, Sphaerochitina sp. The ancient landscape is suggested as having been an area a few square miles in extent with modest relief and comparable to a modern brackish or fresh-water marsh. Three other floras, one in Maine, a second in New Brunswick, Canada, and a third along the coast of Gaspé Bay, Quebec, are thought to have been at least partially contemporaneous with the Trout Valley flora.  相似文献   

16.
Hofmann, Hans J. 1981 12 15: First record of a Late Proterozoic faunal assemblage in the North American Cordillera. Lethaia, Vol. 14, pp. 303–310. Oslo. ISSN 0024–1164. Megafossils are reported from an unnamed Late Proterozoic formation in the Sekwi Brook area of the Mackenzie Mountains of northwestern Canada. The biota includes the metazoans Inkylovia sp. and Sekwia excentrica Hofmann n, gen., n. sp., the trace fossils Gordia sp., Gordiu? sp., and Torrowangea sp., as well as structures of problematic affinities. The metazoans support a latest Proterozoic age for the containing beds. 0 Early Metazoa, body fossils, trace fossils, Problematica, Late Proterozoic, North American Cordillera, Markenzie Mountains, Canada.  相似文献   

17.
系统记述了广西崇左三合大洞巨猿动物群中的反刍类:湖麂(Muntiacus lacustris)、凤岐祖鹿(?)相似种(Cervavitus? cf.C.fenqii)、云南黑鹿(Cervus(R.)yunnanensis)、广西巨羊(Megalovis guangxiensis)、山羊亚科属种未定(Caprinae gen.et sp.indet.)和大额牛未定种(Bos(Bibos)sp.)。与其他相关的早更新世动物群中的反刍类相比, 它们与柳城巨猿洞和田东么会洞的最相似。三合大洞的反刍类在组合上反映早更新世的时代特征及湿热的森林-草丛生态环境。这种环境非常适宜诸如巨猿这类高等灵长类的栖息。  相似文献   

18.
The fossils here described were collected from the Lai Yuan, Hebei Province in north China. Well-preserved plant parts are cones of Pinus, identified as Pinus prototabulaeformis sp. nov. The species is different from other taxa of Pinus by larger cones and scales. The size of the cone is a reliable diagnostic character in the group: The large cone and scale indicate rather an arid climate in Summer in the region where the fossils are discovered. The age of bearing-beds is considered Upper Eocene-Lower Oligocene. Diagnosis: Cones ovate in general outline, 8.5 cm long, 4.5 cm in diameter. Seed scales oblong, 2—2.5 cm long, 0.8—1.1 cm wide. Apophysis obviously fattened andthickned, convex, compressed rhomboid, rostrate at the apical part of seed-bract.  相似文献   

19.
Vishwa J. Gupta 《Geobios》1984,17(4):493-499
Recently collected vertebrate fossils from the Himalayanfoothills of western Nepal comprise the first diverse Plio-Pleistocene mammal assemblage known from Nepal. Specimens representing Stegodon insignis, Elephas planifrons, Equus sivalensis, Hexaprotodon sivalensis, Cervus sp., and two taxa of bovids are present in this collection from Gidhniya Village. The Gidhniya assemblage is biostratigraphically correlated with the «Pinjor fauna of India and Pakistan; it is between 1.5 and 2.9 million years old.  相似文献   

20.
Abstract: Rögla is the northernmost locality yielding Mesozoic plant fossils in Scania, southern Sweden, and is one of the northernmost Rhaetian assemblages in Europe. The assemblage consists of over 500 specimens collected 50–60 years ago, of which 139 yielded identifiable plant remains referable to 15 plant species; another 19 specimens are tentatively assigned to four species because of their fragmentary preservation. The flora includes sphenophytes, ferns, cycads, bennettitaleans, seed ferns of uncertain alliance, conifers and some leaf remains that are tentatively assigned to ginkgophytes based on their epidermal anatomy. The species‐level composition of the assemblage is consistent with a Rhaetian age and is similar to well‐known floras from nearby Höganäs and Bjuv, except for the absence of cycads belonging to Nilssonia, which are very common in most other Scanian floras. The fossil assemblage is interpreted to derive from multi‐storey vegetation occupying moist habitats on a coastal plain. Strong affinities are evident with the coeval floras of Jameson Land, Greenland, reinforcing the concept of a distinctive North Atlantic floristic sub‐province at the close of the Triassic.  相似文献   

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