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报道了新疆吐鲁番拗陷北部勒1、米1、山1和墩1井中侏罗世孢粉化石52属81种。建立了本区中侏罗世孢粉组合:Cyathidites-Psophyosphaera-Cycadopite组合、Cyathidites-Quadraeculina-Classopollis组合和Cyathidites-Callialas-porites-Classopollis组合。它们分别产自西山窑组、三间房组和七克台组。根据孢粉组合特征及其对比,认为3个组合的地质时代属阿林-巴通期。经研究表明,中侏罗世早期的植被是以银杏、苏铁类和松柏类等乔木为主体,并伴有桫椤科树蕨及紫萁科和卷柏科等草本植物。古气候应属温暖潮湿的亚热带气候。至中侏罗世中晚期,掌鳞杉科植物在植被中占主导地位,指示当时的气候趋于干旱。 相似文献
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南极维多利亚地南部Carapace Nunatak中侏罗世孢粉植物群 总被引:3,自引:0,他引:3
南极维多利亚地的费拉群孢粉植物时代一直被认为是早株罗世、从维多利亚地南部Carapace Nunatak费拉群火山岩夹杂中发现的数量丰富,类型多样的孢粉化石。可与澳大利亚西部、阿根廷、印度及巴基斯孢粉植物群比较,推断费拉群时代应为中侏罗世,并很可能为中侏罗世早期。这一结论得到从相同地点获得的叶肢介化石的佐证。根据孢子花粉化石的可能植物亲缘关系,推断中侏罗世早期维多利亚地南部以掌鳞杉科植物较繁盛,并 相似文献
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陕西彬县地区中侏罗世延安组孢粉植物群及其意义 总被引:7,自引:0,他引:7
报道了采自陕西彬县地区中侏罗世延安组的孢粉化石60属,83种。经研究表明,陕西彬县地区延安组的孢粉组合是以裸子植物花粉为主,蕨类植物孢子次之。银杏、苏铁类和松柏类花粉在组合中占优势;桫椤科孢子在蕨类中具有较高的含量。根据孢粉组合特征及其对比,延安组的时代应属中侏罗世早期。陕西彬县地区当时的植被是以银杏、苏铁类和松柏类等乔木为主,并伴有桫椤科为主体的树蕨植物及草本植物,古气候应属大陆性亚热带气候。 相似文献
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内蒙古西部雅布赖盆地中侏罗世晚期植物群 总被引:4,自引:0,他引:4
首次报道产于内蒙古自治区西部阿拉善右旗雅布赖盆地红柳沟剖面中侏罗统新河组的 7属 1 2种植物化石 ,主要由真蕨纲和苏铁纲组成。真蕨纲有Gleichenites,Coniopteris和Cladophlebis等 ,苏铁纲有丰富的Otoza mites和Nilssonia ,Nilssoniopteris等。地质时代为中侏罗世中晚期 ,大致为巴通期到卡洛维期。 相似文献
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南京北象山中侏罗世孢粉化石的发现 总被引:2,自引:4,他引:2
本文对在南京北象山首次发现的孢粉化石进行了系统的分析研究,共获孢子花粉37属77种,其中蕨类植物孢子15属23种,裸子植物花粉22属54种,组合以高含量的Classopollis为特征。根据孢粉组合特征,其时代应归为中侏罗世。对组合中主要孢粉类型可能的母体植物的生长环境进行分析,推测在中侏罗世的某段时期里,南京地区主要为干旱的气候环境。 相似文献
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鄂西早侏罗世香溪植物群真蕨植物研究进展 总被引:5,自引:0,他引:5
近年来对真蕨植物系统发育演化的研究引起了学术界的广泛关注,而对地史时期真蕨化石多样性变化、繁殖器官和原位孢子微细构造的探究成为了解该类群植物辐射演化历史和系统发育不可或缺的途径.我国湖北西部早侏罗世香溪组真蕨植物化石十分丰富,且具有较高的多样性.包括合囊蕨科、紫萁科、马通科、双扇蕨科及蚌壳蕨科等,共计约11属25种.近年来,对该地区真蕨植物化石研究日渐深入,并在多个领域取得了一系列重要进展.基于鄂西秭归地区保存完好的生殖器官化石标本,先后获得了合囊蕨科Marattia asiatica、马通科Phlebop-teris polypodioides、双扇蕨科Dictyophyllum nilssonii、蚌壳蕨科Coniopteris cf.bella和Coniopteris sp.等种原位孢子.利用扫描和透射电镜等手段对Marattia asiatica和Dictyophyllum nilssonii原位孢子超微结构的研究,对认识真蕨植物系统发育和演化提供了重要的微观证据.香溪组上部真蕨植物代表我国早中生代南方植物区系典型的真蕨植物生态群落,且以马通科Phlebopteris和双扇蕨科Dictyophyllum为主导分子,伴生有合囊蕨科、紫萁科和蚌壳蕨科分子,指示热带、亚热带温暖潮湿气候类型,并代表原位埋藏的泥炭沼泽生态环境. 相似文献
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新疆塔里木盆地中侏罗世塔尔尕组孢粉植物群及地层和古地理意义 总被引:1,自引:0,他引:1
新疆塔里木盆地侏罗系分布广泛,在库车凹陷和塔西南区发育最好。目前对库车凹陷的三叠纪和侏罗纪孢粉植物群研究较为深入,而对塔西南区侏罗纪孢粉化石专题研究不多,尚未建立孢粉组合。作者基于塔西南区乌恰中侏罗统塔尔尕组发现的孢子花粉33属48种的研究,建立了塔尔尕组孢粉组合。该组合以掌鳞杉科花粉Classopollis的优势和真蕨目桫椤科孢子Cyathidites的繁盛为特征,并含有丰富多样且颇具侏罗纪色彩的孢子花粉化石类型。该组合与西欧和俄罗斯巴柔期至巴通期孢粉组合以及北美和澳大利亚巴柔期至卡洛夫期孢粉组合可以进行对比;与我国新疆库车恰克马克组、陕西延安直罗组和湖北兴山沙溪庙组等孢粉组合也可对比。根据孢粉学证据,塔尔尕组的时代应属于中侏罗世晚期(巴通期至卡洛夫期)。当前孢粉植物群支持我国侏罗纪南北植物地理区系之西端分界之划分方案,即塔西南乌恰处于界线以南,而库车处于分界以北。 相似文献
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湖北秭归盆地中侏罗世陈家湾组孢粉组合的发现及其意义 总被引:1,自引:0,他引:1
本文首次报道了湖北秭归盆地陈家湾组孢粉组合,该组合可归入Cyathidites minor-Classopollis Callialasporites为代表的组合,时代属中侏罗世。陈家湾组孢粉组合的特征反映了秭归盆地中侏罗世泄滩组、陈家湾组和沙溪庙组三个组的孢粉组合的面貌基本一致,仅早期组合与中、晚期组合略有差别。建议以Gyathidites minor-classopollis-callialasportes组合代表湖北西部——重庆地区中侏罗世孢粉组合,早期为Lunzisporites pallidus亚组合,中晚期为Converrrcosisporites venitus亚组合。根据孢粉植物群在本区侏罗纪垂直分布情况,提出早侏罗世时期属亚热带一热带炎热潮湿气候环境,植物生长茂盛;早侏罗世之后,潮湿的气候仍占主导地位,但出现了干旱的先兆;中侏罗世早期进入了半干旱阶段,随后即为炎热干旱的气候所笼罩;至晚侏罗世达到非常干旱的程度,植物种类十份单调,唯有掌鳞杉科植物占据着统治地位。 相似文献
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Yun-Feng Li Chun-Lin Sun Hongshan Wang David L. Dilcher Xiao Tan Tao Li Yu-Ling Na 《Palaeoworld》2018,27(2):188-201
The genus Eretmophyllum, a characteristic and widespread taxon of the order Ginkgoales, is restricted in the Mesozoic floras of Eurasia. In China, although some specimens were assigned to Eretmophyllum based on gross leaf morphology, none have epidermal structure, which is essential for species delimitation within this genus. In this paper, we describe a new species, Eretmophyllum neimengguensis n. sp., from the Middle Jurassic Yan’an Formation of the Ordos Basin, China. This is the first record of the genus Eretmophyllum (Ginkgoales) from the Ordos Basin as well as from China based upon the gross leaf morphology and the epidermal structure. The new record significantly extends the stratigraphic and geographic distribution of Eretmophyllum in China and Eurasia. It also improves our understanding of its leaf morphology, epidermal structure, and past diversity. The taxonomic position and the stratigraphic and geographical range of the genus Eretmophyllum are discussed. Briefly, leaf morphological and epidermal characters of the new species, associated plant assemblages, and sedimentology indicate that the regional climate of the Ordos Basin was warm and humid with seasonal temperature and precipitation fluctuations in warm-temperate zone during the Middle Jurassic. Furthermore, given the relationship between the distribution/diversity of the genus and the climate, the genus Eretmophyllum may be confined to the warm-temperature climate, is intolerant of heat and frost, and can be considered as an indicator of humid and warm climatic conditions. 相似文献
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《Palaeoworld》2016,25(3):388-398
The Middle Jurassic Jiulongshan Formation, distributed in the Daohugou area, Ningcheng County, Inner Mongolia, China, is famous for yielding abundant, well-preserved fossil vertebrates and invertebrates. However, only a few fossil plants have been reported to date. In this paper, one new species of Czekanowskiales, Phoenicopsis (Windwardia) daohugouensis n. sp. is described based upon leaf morphology and epidermal characters. The new species represents the first record of Czekanowskiales from the Daohugou Biota. The discovery of the new species reveals the significance of the Daohugou flora as one of the deciduous forests in the temperate-warm temperate zone of Eurasia during the Middle Jurassic. 相似文献
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Lida Xing Martin G. Lockley Hendrik Klein Gerard D. Gierliński Yong Ye Jianping Zhang 《Ichnos》2019,26(1):8-15
Two tridactyl footprints from the Chuanjie Formation (Middle Jurassic) of Yunnan Province, China are morphological characteristics of thyreophoran tracks. They show some similarities to Shenmuichnus, known from the Early Jurassic strata of both Shaanxi and Yunnan provinces, but are somewhat larger, thereby resembling the ichnogenus Stegopodus. Based on their general morphology and size being congruent with this ichnogenus, they are tentatively assigned here to cf. Stegopodus. This is the fourth report of large ornithischian (probably thyreophoran) tracks from the Lower-Middle Jurassic of China that indicates relatively large trackmakers that were likely to be taxonomically distinct from much smaller and gracile Anomoepus trackmakers, also of ornithischian affinity. The larger tracks indicate a hitherto unreported abundance, size range and diversity of track types attributed to this group. The parallel orientation of the two best preserved trackways may indicate gregariousness. 相似文献
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本文对扁头中国短头鲵(新属新种) (Sinobrachyops placenticephalus gen. et sp. nov.) 的形态特征和分类位置进行简述.标本得自著名的恐龙化石产地——自贡大山铺,产出时代为中侏罗世.中国短头鲵是目前迷齿类中在地史上最年轻的一个属.它的发现使迷齿类在地球上生存时代的上限推移到中侏罗世. 相似文献
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Asha Khandelwal 《Aerobiologia》2001,17(1):77-83
The monitoring of airborne pollen and fungal spores ofLucknow has been achieved using a Rotorod Sampler. 43types of pollen and 40 types of fungal spores havebeen recorded over a period of one year(January–December, 1997). Pollen and fungal sporecalendars have been constructed. Quantification of theaerospora will help in further understanding aeroallergens and the diagnosis and treatment ofvarious respiratory diseases. 相似文献
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Abstract: Three new species, attributed to the extinct family Xyelydidae of the Pamphilioidea (Order Vespida = Hymenoptera), are described from the Middle Jurassic of Daohugou, Inner Mongolia, China: Ferganolyda scylla sp. nov., F. charybdis sp. nov. and F. chungkuei sp. nov. The new material demonstrates that the genus Ferganolyda , which was previously considered to be a morphologically ordinary group of web-spinning sawflies, is in fact a highly unusual insect taxon. It is characterised, particularly in the male sex, by a huge head (about half as wide as the entire body length) and unusual modification of the antennae. Interpretation of the function of the unusual head and antennae is intriguing but unresolved. 相似文献
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文中研究报道产自川西松潘县红土坡的中新统马拉墩组孢子花粉植物群。迄今为止,人们关于青藏高原东北边缘新近纪古植被的所知甚少。红土坡马拉墩组孢粉组合的总体特征是榆科(Ulmaceae)、桦木科(Betulaceae)以及松科(Pinaceae)花粉比较丰富,蕨类孢子稀少。被子植物花粉在整个组合中含量最高,占孢粉总数的52.4%—84.4%;其次是裸子植物花粉,占13.8%—44.1%;蕨类孢子仅占1.2%—5.1%。被子植物中以榆科和桦木科花粉最多。榆科花粉可达孢粉总数的14.7%—28.8%,其中绝大多数是榆属(Ulmus),其他可能包括少许榉属(Zelkova)。桦木科花粉含量也很高,达12.6%—25.7%,主要为桦木属(Betula)和桤木属(Alnus)。此外,杨柳科(Salixaceae)、山毛榉科(Fagaceae)以及胡桃科(Juglandaceae)也有一定含量。这样的孢粉组合代表了以落叶阔叶树为主的针阔叶混交林。与此组成相同或相近的森林在我国现代落叶阔叶林或针阔叶混交林植被中很难见到。根据和同期与红土坡纬度相当地区的孢粉组合的对比,推测在早中新世当地的海拔高度已经超过1 000 m,甚至达到2 000 m左右,也即已经接近或仅略低于当地现今的高度。 相似文献