共查询到20条相似文献，搜索用时 15 毫秒
1.
遗迹化石大都是原地埋藏,研究遗迹化石在古环境、古气候、古海洋和古生态等方面的重建具有重要的意义。綦江国家地质公园老瀛山园区夹关组地层中已发现的无脊椎动物遗迹化石经鉴定包括1大类3属3种,分别为觅食迹Scoyenia gracilis(纤细斯柯茵迹)、Beconites antarcticus(南极似塔形迹)和Planolites beverleyensis(贝弗利漫游迹)。这些遗迹化石都属于Scoyenia遗迹相,代表了研究区在白垩纪夹关期为间断性暴露地表的河漫滩或者滨浅湖环境。 相似文献
2.
The Marwar Supergroup of the Bikaner-Nagaur Basin is composed of sediments deposited from the late Neoproterozoic (Ediacaran) to Upper Cambrian. The Nagaur Sandstone Formation of the Nagaur Group (uppermost division of the Marwar Supergroup) preserves trace fossils significant for establishing Early Cambrian biostratigraphic zones and depositional facies. Fifteen ichnospecies (and eight ichnogenera) identified in the Nagaur Sandstone Formation include “Treptichnus” pedum, Cruziana cf. tenella, Cruziana isp., Diplichnites ispp. A, B, and C, Gyrophyllites isp., Lockeia isp., Merostomichnites isp., Monomorphichnus gregarius isp. nov., Monomorphichnus isp., Planolites isp., Psammichnites isp., Rusophycus bikanerus isp. nov., Rusophycus cf. carbonarius, Rusophycus isp. and radial trace fossils.These trace fossils belong to ethological categories pascichnia, repichnia, cubichnia, and fodinichnia and represent arthropod and worm-like burrowing biota. The assemblage and a regional comparison with contemporaneous trace fossils in the eastern Gondwanan realm suggest that the sequence in the study area belongs to the Cruziana tenella Ichnozone and to Stage 2 (upper part of Terreneuvian), however the Middle Cambrian is not excluded. The trace fossil assemblage belongs to the archetypal Cruziana ichnofacies. Cross bedded sandstone, mud cracks and rainprints in the ichniferous strata of the Nagaur Sandstone Formation indicate deposition in an intertidal sand flat with channels that was exposed episodically. 相似文献
3.
Robert Metz 《Central European Journal of Geosciences》2012,4(1):3-8
Mudstones of the Triassic Passaic Formation, near Milford, New Jersey, have yielded the first evidence of an arthropod impression in that formation. Associated trace fossils include Helminthoidichnites, Lockeia, Scoyenia, Spongeliomorpha, and the reptile footprint Rhynchosauroides, representing the Scoyenia ichnofacies. Associated sedimentary structures include desiccation cracks and raindrop impressions. The Passaic sediments were deposited under shallow water lacustrine shoreline conditions subject to periodic subaerial exposure. 相似文献
4.
四川省壤塘县金木达晚三叠世深水沉积中的遗迹化石及沉积环境分析 总被引：7，自引：1，他引：6
四川壤塘金木达日基沟晚三叠世地层中首次发现了大量的遗迹化石,经鉴定有 38个遗迹属、6 3个遗迹种。根据不同遗迹属在不同层位的相对丰度,建立了 5个遗迹组合 全部遗迹组合均属于Nereites遗迹相。同时应用遗迹化石的生态习性分类、特征遗迹化石和遗迹相来进行沉积环境的分析,认为金木达晚三叠世中晚期的沉积环境经历了大陆斜坡下部-深海盆地边缘-大陆斜坡中下部-深海盆地-大陆斜坡下部的演变。 相似文献
5.
黔南泥盆系的风暴遗迹相 总被引：2，自引：0，他引：2
风暴沉积岩在黔南泥盆系地层中比较常见，其中的遗迹化石也较为丰富，为研究风暴遗迹相提供了良好的场所。风暴作用的强度和持续时间影响了沉积环境的水能量、含氧量等物化条件，遗迹化石群也随之有所变化。本文研究了发生在Ｇｌｏｓｓｉｆｕｎｇｉｔｅｓ，Ｓｋｏｌｉｔｈｏｓ，Ｃｒｕｚｉａｎａ和Ｚｏｏｐｈｙｃｏｓ等不同遗迹相环境中的风暴沉积遗迹化石组合，把它们划分为三种类型：（１）单调型风暴遗迹相，风暴作用较弱，风暴沉积过程中的遗迹化石属种和数量较少，但仍与风暴前后的遗迹化石组合属于Ｓｅｉｌａｃｈｅｒ（１９６７）的相同遗迹相；（２）混合型风暴遗迹相，风暴沉积形成新的遗迹相附加于较低能的遗迹相中；（３）多元混合型风暴遗迹相，随着强烈风暴作用强度的变化，在风暴沉积期出现两种以上遗迹相的沉积环境 相似文献
6.
The Middle Jurassic rocks of the Kaladongar Formation well exposed in the Kaladongar Hill range of the Patcham Island and Kuar Bet of the Northern Kachchh comprises of ∼450 m thick sequence of mixed siliciclasticcarbonate sediments intercalated with shales. These Mixed siliciclastic-carbonate sediments show wide variation in textural and mineralogical composition and represent genetically related six rock types: micritic sandstone, allochemic sandstone, sandy allochemic limestone, micrtic mudrock, sandy micrite and muddy micrite; which are highly bioturbated and show behaviourally diverse groups of trace fossils. Total 34 ichnogenera are identified, which includes, Arenicolites, Asterosoma, Beaconites, Bergaueria, Chondrites, Cochlichnus, Dactylophycus, Daedalus, Didymaulichnus, Diplocraterion, Gordia, Gyrochorte, Gyrolithes, Ichnocumulus, Laevicyclus, Lockeia, Margaritichnus, Monocraterion, Nereites, Ophiomorpha, Palaeophycus, Phoebichnus, Phycodes, Pilichnus, Planolites, Plug Shaped Form, Protovirgularia, Rhizocorallium, Scolicia, Skolithos, Taenidium, Teichichnus, Thalassinoides and Walcottia. These trace fossils are classified into six morphological groups namely, circular and elliptical structures; simple structures; branched structures; rosette structures; spreiten structures; and winding and meandering structures. These trace fossils are further group into eight assemblages which occurred together into mixed siliciclastic-carbonate sediments, include, Asterosoma assemblage, Gyrochorte assemblage, Rhizocorallium assemblage, Thalassinoides assemblage, Planolites-Palaeophycus assemblage, Phycodes assemblage, Ophiomorpha assemblage and Skolithos assemblage. The recurring pattern of these assemblages through the sequence displays the development of Skolithos and Cruziana ichnofacies and at places the mixed Skolithos-Cruziana ichnofacies which suggest a low wave and current energy conditions with intervening period of high wave and current energy conditions and an intermediate period of stressful environments, respectively. Sedimentological and ichnological data suggest that the deposition of the mixed siliciclastic-carbonate sediments of the Kaladongar Formation took place in the foreshore to offshore environment under fluctuating wave and current energy condition. 相似文献
7.
Twenty one ichnogenera and 30 ichnospecies are recognized in the Late Campanian – Maastrichtian Monte Antola Formation of Italy, most of them for the first time. They belong to a specific mixture of the Nereites and Ophiomorpha rudis ichnosubfacies of the Nereites ichnofacies. Composition and abundance of trace fossils vary from outcrop to outcrop. Chondrites intricatus, Ch. targionii, Nereites irregularis, Cladichnus fischeri and Trichichnus linearis are most common. Chondrites patulus, Ophiomorpha recta and “Spirophycus” bicornis trace fossils are less common in outcrops, and the other trace fossils are rare or very rare. Generally, ichnogeneric diversity in Cretaceous–Cainozoic calcareous and mixed siliciclastic-calcareous flysch deposits is distinctly lower than in siliciclastic flysch. Significantly, the foremost pre-depositional forms are distinctly rare, probably due to preservational and depositional factors. 相似文献
8.
《Proceedings of the Geologists' Association. Geologists' Association》2022,133(6):518-525
Plug-shaped trace fossils B. perata, B. hemispherica, Bergaueria isp., Calycraterion samsonowiczi, Conostichus ornatus and Conostichus isp. are found in the middle-upper Oxfordian fine-grained sandstone of the Argiles de Saïda Formation (northwestern Algeria). Except for the trace Calycraterion which is interpreted as an annelid trace, these traces correspond to distinct behaviours of sea anemones, and their occurrence within tempestite deposits is influenced by a stress factors in a storm-dominated environment. The abundance of these plug-shaped trace fossils suggests that the upper Jurassic siliciclastic shelves with fine-grained soft clastic substrate were colonised by actinarian sessile benthos. 相似文献
9.
贵州独山泥盆系－石炭系界线附近的遗迹化石 总被引：9，自引：0，他引：9
独山地区的革老河组和汤粑沟组中含有丰富的遗迹化石，可分为：Ｓｋｏｌｉｔｈｏｓ－Ｄｉｐｌｏｃｒａｔｅｒｉｏｎ，Ｒｈｉｚｏｃｏｒａｌｌｉｕｍ－Ｔｈａｌａｓｓｉｎｏｉｄｅｓ，Ｃｈｏｎｄｒｉｔｅｓ－Ｐａｌａｅｏｐｈｙｃｕｓ，Ｔｅｉｃｈｉｃｈｎｕｓ－Ｐｌａｎｏｌｉｔｅｓ，Ｐｌａｎｏｌｉｔｅｓ－Ｃｏｃｈｌｉｃｈｎｕｓ等５个反映不同沉积环境的遗迹组合，并在剖面上展现出较好的海平面变化。通过对遗迹组合所反映环境的研究，独山地区泥盆系－石炭系界线附近的沉积环境受脉动式海平面升降的影响和控制，界线可能在汤粑沟组底部钙泥质条带灰岩明显海退事件之上的第一次海进层附近。 相似文献
10.
贵州独山泥盆系－石炭系界线附近的遗迹化石 总被引：1，自引：1，他引：1
独山地区的革老河组和汤粑沟组中含有丰富的遗迹化石，可分为：Ｓｋｏｌｉｔｈｏｓ－Ｄｉｐｌｏｃｒａｔｅｒｉｏｎ，Ｒｈｉｚｏｃｏｒａｌｌｉｕｍ－Ｔｈａｌａｓｓｉｎｏｉｄｅｓ，Ｃｈｏｎｄｒｉｔｅｓ－Ｐａｌａｅｏｐｈｙｃｕｓ，Ｔｅｉｃｈｉｃｈｎｕｓ－Ｐｌａｎｏｌｉｔｅｓ，Ｐｌａｎｏｌｉｔｅｓ－Ｃｏｃｈｌｉｃｈｎｕｓ等５个反映不同沉积环境的遗迹组合，并在剖面上展现出较好的海平面变化。通过对遗迹组合所反映环境的研究，独山地区泥盆系－石炭系界线附近的沉积环境受脉动式海平面升降的影响和控制，界线可能在汤粑沟组底部钙泥质条带灰岩明显海退事件之上的第一次海进层附近。 相似文献
11.
Pelagic and hemipelagic sediments of the Bonarelli Level (uppermost Cenomanian) in the Sztolnia section (Grajcarek Unit, Polish Carpathians) contain trace fossils of the Zoophycos ichnofacies, including (in descending order of abundance): Chondrites (smaller and larger forms), Planolites, Thalassinoides, Palaeophycus, Taenidium, Teichichnus, and Zoophycos. They occur in thick bioturbated layers, which are interbedded with rare, thin layers of unbioturbated black shales. The black shale layers mark the Bonarelli Level and are interpreted as a record of anoxia or dysoxia. Coeval sections in the Western Tethys contain similar trace fossils but they are less abundant and these sections are characterized by thicker unbioturbated black shale layers and thinner bioturbated layers. This confirms the exceptionally favourable life conditions in sediments of the Sztolnia section, which do not record strong global anoxia during the OAE-2 event. Such favourable conditions were probably caused by effective oxygenation of pore waters and deep burial of organic matter, which are a consequence of high rates of accumulation and the palaeogeographical location of the section on a flank of a submarine high, under strong circulation. 相似文献
12.
西准噶尔复理石相遗迹化石主要分布于上泥盆统-下石炭统塔尔巴哈台组以及石炭系的包古图组、太勒古拉组和哈拉阿拉特组中, 典型遗迹属包括Phycosiphon, Nereites, Megagrapton, Glockerichnus, Cochlichnus, Lophoctenium, Gordia, Chondrites, Zoophycos, Scolicia, Thalassinoides.这些遗迹化石构成具有典型深水Nereites遗迹相特征的Phycosiphon-Nereites遗迹化石组合和Megagrapton-Glockerichnus-Cochlichnus遗迹化石组合.包古图组和太勒古拉组属于海底扇中下扇扇缘-盆地平原环境; 哈拉阿拉特组和塔尔巴哈台组则属于海底扇中下扇扇叶环境.西准噶尔复理石相遗迹化石分布与鲍马序列的厚度密切相关, 在毫米-厘米级鲍马序列中, 遗迹化石属种单调且保存较差, 可见单一属的Phycosiphon或Nereites; 而在厘米-分米级鲍马序列中, 可见不同直径大小和形态上具有过渡的Phycosiphon和Nereites, 可能代表同种造迹生物不同个体发育阶段的生物遗迹.海底扇不同亚环境单个鲍马序列的厚度决定了底栖生物是否有足够的时间形成较为成熟的群落(包括一系列幼年和成年个体). 相似文献
13.
In the first ever systematic study of trace fossils from the Badhaura Formation, the authors described a nesting burrow, which they ascribed to a stomatopod. The purpose of this paper is two-fold: primarily, to document ichnofauna from (post-glacial marine late Palaeozoic rocks of peninsular India) the Badhaura Formation (Sterlitmakian) representing marine rocks deposited following the Late Palaeozoic glaciation and secondly to contribute to the data on post-glacial ichnofauna from constituent continents of the Gondwanaland. Trace fossils described here are from the Harbans Bed, the topmost lithounit of the Badhaura Formation. The ichnofauna includes Arenicolites tenuis, Beaconites isp., Curvolithus isp., Cylindrichnus concentricus, Didymaulichnus lyelli, Ophiomorpha isp., Palaeophycus tubularis, Planolites beverleyensis, P. montanus, Rosselia chonoides, R. socialis, Skolithos linearis, Taenidium cameronensis, Thalassinoides paradoxicus, Thalassinoides isp. and a flask-shaped brood chamber assigned to a stomatopod crustacean. This mixed assemblage is assigned to distal Skolithos ichnofacies and is suggestive of a period of relatively quiet, shallow water conditions of deposition. The ichnofauna, when viewed in context of peri-gondwanic ichnofaunas, mainly consisting of simple tracks and trails, from late Palaeozoic post-glacial deposits of other Gondwanan continents, is interesting due to dominance of domichnia. Profusion of brood chambers along with Thalassinoides in the Badhaura Formation validates the concept of pre-Mesozoic Thalassinoides being non-decapod in origin and suggestive of adaptive convergence. 相似文献
14.
BAI Zhongkai Lü Xiuxiang LIU Xiaoping XIE Qilai LI Jianjiao WU Jianjun 《《地质学报》英文版》2012,86(2):313-319
Based on the analysis of trace fossils collected from the typical outcrop of the Lower Cambrian Wusongger Formation in the Kalpin area, ten ichnospecies of six ichnogenus were identified in the upper member of the Wusongger Formation, with most of them being found for the first time. The trace fossils are described seriatim. The ichnospecies are mainly represented by such common trace fossils as Ophiomorpha nodosa, Helminthopsis hieroglyphica, Helminthopsis ichnosp., Planolites beverleyensis, Planolites vulgaris, Planolites montanus, Palaeophycus striatus, Palaeophycus curvatus?, Cochlichnus anguineus and Rituichnus elongatum. The trace fossils are of high diversity and low abundance, and can be diagnosed as the Cruziana ichnofacies. They can be interpreted as having formed in a shallow water environment. 相似文献
15.
16.
西秦岭西段志留纪遗迹化石 总被引：2，自引：0，他引：2
本文研究了西秦岭西段志留纪海水深浅不同的两种遗迹相及其沉积环境,一种是甘南迭部拉路沟中志留世晚期浅海砂岩系所含Cruziana遗迹相,另一种是川北若尔盖晚志留世早期深海复理石Nereites遗迹相。共描述遗迹化石10属11种,其中建立3个新遗迹种。这些遗迹化石对研究西秦岭的地层发育、沉积矿产和古环境的演变提供了重要的生物成因标志,对我国的遗迹化石研究也提供了新的资料。 相似文献
17.
In contrast to Solnhofen-type conservation Lagerstätten, the platy limestones of the Benkovac Stone of the Eocene of Croatia contains a variety of trace fossils. They belong to the Nereites ichnofacies, characterized by a suite of highly specialized ichnogenera, turbiditic preservation, and distinctive pre-event versus post-event communities. In siliciclastic rocks, this ichnofacies stands for turbiditic deep-sea sediments. Also unusual is the lack of body fossils. The only exceptions are occasional plant debris and Bencovacina concentrica. n. gen., n. sp., which is affiliated with xenophyophorian Foraminifera. These giant protozoans survive on present deep-sea bottoms, but they were also common on the shallow-marine biomats in Ediacaran times. These findings contradict the current shallow-marine interpretation, which is based on the regional geologic setting and sedimentary structures typical for tempestites. Thus, the Benkovac Stone would be an ideal place to test the reliability of ichnological versus sedimentological depth criteria in an entirely calcareous sequence. 相似文献
18.
Imad Bouchemla Mohamed Bendella Madani Benyoucef Olev Vinn Bruno Ferré 《Proceedings of the Geologists' Association. Geologists' Association》2021,132(2):207-226
The Upper Emsian to Frasnian Ia-Ib strata of the Marhouma area (or “km 30” outcrop), exposed in the Ougarta Range (SW Algeria) belong to the Chefar El Ahmar Formation. On the basis of distinct lithological and palaeontological features, this formation is subdivided into three members (Lower Marly Limestones Member, Middle Marly Limestones Member, and Upper Marly Limestones Member). The studied beds show low to moderate diversity of trace fossil assemblage which contains thirteen ichnotaxa: Chondrites intricatus, Chondrites isp., Chondrites cf. targionii, Circulichnis cf. montanus, Cochlichnus isp., Neonereites biserialis, Neonereites multiserialis, Nereites isp., Palaeophycus isp., Planolites isp., Thalassinoides isp., Zoophycos aff. cauda-galli, and Zoophycos isp. A. The two latter ichnotaxa are the most common trace fossils in the assemblage and occur at three different levels showing different bioturbation intensities. The first Zoophycos-bearing level (Zl 1) is characterised by an overall high bioturbation intensity reflecting a very high oxygenation rate and nutrient supply, allowing the development of large and dense Zoophycos specimens. The second Zoophycos-bearing level (Zl 2) has a considerable reduction of bioturbation intensity as compared to the previous level, with an abundance of Chondrites, which is probably due to radical palaeoecological changes that suggests dysoxic and stressful conditions. The third Zoophycos-bearing level (Zl 3) is characterised by an overall moderate bioturbation intensity. The distribution of trace fossils was influenced by lithology, sedimentation rate, energy level (storm events), bottom oxygenation, and nutrient supply. The lithofacies and trace fossils of the Chefar El Ahmar Formation both indicate a depositional environment fluctuating from the lower shoreface to lower offshore zone. 相似文献
19.
桌子山中奥陶世公乌素组遗迹化石组合与古地理环境 总被引：7，自引：0，他引：7
据遗迹化石新资料 ,将内蒙古桌子山地区中奥陶世公乌素组遗迹化石自下而上划分为 8个组合 :Taenidium组合、Zoophycos组合、Volkichnium组合、H elminthopsis-Paleodictyon组合、Granularia组合、 Circulichnus组合、 Chondrites组合及 H elminthopsis组合。其中 ,H elminthopsis-Paleodictyon与 H elminthopsis两组合属于 N ereites遗迹相 ,并分别出现于陆隆 -深海盆地浊积扇与陆隆浊积扇环境 ;其余 6个组合与 Seilacher( 1 967)的 Zoophycos遗迹相相当 ,代表有机质丰富、平静而贫氧的大陆斜坡环境。遗迹组合序列和遗迹相的递变表明 ,本区在公乌素组沉积期经历了两次由陆棚边缘盆地—大陆斜坡—陆隆 -深海盆地浊积扇 (或陆隆浊积扇 )的环境演变。指出了本组遗迹化石与波兰喀尔巴阡山复理石相遗迹化石在分布上的相似性。认为 Zoophycos相各遗迹组合所赋存的泥灰岩等是很好的生油岩。 相似文献