安徽巢湖地区早三叠世菊石序列

由于地处低纬度下扬子碳酸盐缓坡台地较深水区 ,安徽巢湖地区的下三叠统由一系列泥、灰岩旋回层组成 ,并含有丰富的菊石化石。通过对巢北平顶山和马家山一带上二叠统顶部和下三叠统多条剖面的系统研究 ,建立了在华南乃至低纬度特提斯地区具有代表性的、以属级分类单位为基础的下三叠统菊石生物地层序列 (从下而上 ) :Ophiceras Lytophiceras带、Gyronites Prionolobus带、Flemingites Euflemingites带、Anasibirites带、Columbites Tirolites带和Subcolumbites带。在提议的全球印度阶 奥伦尼克阶界线层型候选剖面———巢湖平顶山西坡剖面上 ,Flemingites Euflemingites带之底与牙形石Neospathoduswaageni首现点比较接近 ,可以作为本界线主要辅助标志之一。记述采自该区上二叠统顶部及下三叠统 ,尤其是印度阶 奥伦尼克阶界线附近的一些具有年代地层意义的菊石化石资料 。     

四川盆地下三叠统牙形刺及其油气意义

作者对四川盆地２４条以海相碳酸盐岩地层为主的下三叠统剖面作了系统的研究,在取得了丰富的牙形刺资料的基础,对下三叠统牙形刺进行了区域对比,划分了７个牙形刺带。并对牙形刺色变与油气的关系等进行了研究。编制了ＣＡＩ、古地温等值线图及其与油气分布关系图,并提出了该盆地最有利的油气远景区ＣＡＩ＝２－３;有利的产油气区ＣＡＩ＝２．５－３的新看法。     

松辽盆地西南部下三叠统及其孢粉组合

本文对松辽平原西南部开鲁盆地哲中坳陷中的八仙筒凹陷和奈曼凹陷的参数井所揭露的地层及其孢粉化石进行了系统的分析和研究。该参数井揭露出的下三叠统哈达陶勒盖组,按岩性及其孢粉组合特征划分为下、上两段。下段孢粉以Calamospora -Lundbladispora-Alisporites组合为代表;上段孢粉以Verrucosisporites -Lundbladis pora -Chordas porites组合为代表。时代为早三叠世。     

新疆南部中生代几种刺丝胞动物化石

本文研究的材料采自新疆—西藏公路沿线的萨利吉勒干南库勒以的龙巴其保大坂一带。区内出露的地层有上三叠统、上三叠统—下侏罗统、中侏罗统—下白垩统,它们组成一背斜构造,是喀喇昆仑山的主体。本区上三叠统未见底,其上与上三叠统—下侏罗统呈整合接触,为一套海相碳酸盐岩,其岩性为生物碎屑灰岩、泥灰岩夹鲕状灰岩。这套地层目前尚未命名,其实测剖面如下:     

华南东部晚三叠世和早侏罗世双壳类材料及其时代意义北大核心CSCD

华南东部地区晚三叠世—早侏罗世海陆交互相地层中的半咸水-海相双壳类,对于我国广泛分布的陆相上三叠统和下侏罗统的划分具有重要的意义。文中系统描述了该区晚三叠世和早侏罗世双壳类19属29种,其中Trigonucula sakawana Ichikawa,1949,Pteria sturi(Bittner,1895),Costigervillia minima Wen,1979和Cercomyapraecursor Quenstedt,1856为首次在这一区域报道;并根据新材料将前人报道的Isocardioides Fan,1962修订为Schafhaeutlia Cossmann,1897。综合这些材料和前人研究将该区小水组、三家冲组和金鸡组双壳类分别划为以下三个组合带,即Palaeopharus-Trigonucula组合带、Bakevelloides-Jiangxiella组合带和Parainoceramus-Ryderia guangdongensis组合带。文中通过对上述组合中代表属种在区域上的时代延限的分析,认为PalaeopharusTrigonucula带和Bakevelloides-Jiangxiella带的时代限于晚三叠世卡尼期(Carnian),可能延至诺利期(Norian)早期;Parainoceramus-Ryderia guangdongensis带的时代主要为早侏罗世辛涅缪尔期(Sinemurian),可能下延至赫塘期(Hettangian),上延至土阿辛期(Toarcian)。     

广州市郊上三叠统小坪组昆虫

一、前言本文记述的3种化石昆虫采自广州市西北石井崩岗上三叠统小坪组含煤岩层,2种为(虫非)蠊盖翅:Triassoblatta tegmina sp.nov.,Triassoblatta opistodictyna sp.nov,属中生(虫非)蠊科三叠(虫非)蠊属;另一种为鞘翅目的鞘翅Shijingocoleus margacrispus gen.et sp.nov.,属裂鞘甲科的新属、新种。前二种(虫非)蠊类于粤中乃首次报道;后一种裂鞘甲不仅是我国的首次发现,也是世界上中生代地层中的首次发现,此科以往的地史记录是晚石炭世一晚二叠世,小坪组发现的这个科证明它存在时间可延续至晚三叠世。     

辽宁锦西红砬组叶肢介化石的发现及其意义

一、前言红砬组分布于辽宁锦西、南票、朝阳等地,为一套陆相碎屑沉积,大多由紫红色砂、砾岩组成,厚500余米。张丽旭(1943)最初命名为红砬统,时代置于三叠纪。李星学(1963)改称红砬组,列二叠纪晚期,与石千峰组相比。辽宁区测队(1976)则称石千峰群,认为属上二叠至下三叠统。辽宁省区域地层表编写组(1978),     

论狭义瓦根股蛤Waagenoperna(Waagenoperna)及其在华南“下侏罗统”的分布

我国华南湘赣等省下部中生界的艮口群、门口山组(?林山组)等沉积地层,长期被人据植物化石,视作印支构造旋回以后的陆相下侏罗统或上三叠统至下侏罗统。顾知微等于1963年前,为区域地层等工作所作初步化石鉴定中,所定的费尔干蚌Fergano-concha,西伯利亚蚌Sibireconcha,假铰蚌Pseudocardinia(=Acyrena),和偏顶蛤Modiolus(=Volsella)等名称,不久,已被他自己发觉为鉴定错误,这些地层因产瓦根股蛤和江西蛤     

贵州晴隆中营晚二叠一早三叠世腹足类的食性与形态

贵州晴隆中营的上二叠统、下三叠统已有详细的研究。本文仅对地层中出现的腹足类化石做生态学的研究。本区上二叠统划分为峨眉山玄武岩组、龙潭组、凉风坡组,下三叠统为飞仙关组。龙潭组是一套碎屑岩夹一层厚层状石灰岩,含海相化石;凉风坡组也是一套碎屑岩,但夹有较多的硅质结核和硅质灰岩层。飞仙关组和凉风坡组之间是连续过渡沉积。根据沉积物和古生物特征推测,从龙潭组到凉风坡组的岩相是由滨海沼泽相变为浅海滨海相(姚兆奇、徐均涛等,1980),海水由龙潭期的时进时退变为长兴期的逐步加深。岩相的变化在古生物面貌     

甘肃玉门大山口动物群层位及北祁连区二叠和三叠纪地层

重新研究了甘肃玉门含大山口动物群的地层,讨论了北祁连区二叠和三叠系划分,指出西大沟组存在误用,建议将上三叠统的西大沟组更名,将中二叠统产大山口动物群的西大沟组更名为青头山组,并将青头山剖面指定为青头山组命名剖面.     

Pleuromeia discovered from the Middle Triassic Linjia Formation of Benxi,Northeast China

A new species Pleuromeia shaolinii Zhang et Wang n. sp. was established under the family Pleuromeiaceae, based on eight specimens of stems and leaves, cones, rhizophores, and adventitious roots that were recently collected from the Middle Triassic Linjia Formation in Benxi, Northeast China. P. shaolinii n. sp. is similar to the type species P. sternbergii, in the morphology of the stem and rhizophore, but differs from it by the transversely rounded sporophylls organized in a heterosporous cone, and the two conspicuous triangular scars present on both sides of the vascular bundle scar. The Linjia flora, an only reliable Middle Triassic flora in Northeast China, was discovered 40 years ago. Although the Linjia Formation can be compared with the Middle Triassic Ermaying Formation from another area of the North China plate, its age was questionable due to the absence of the Early to Middle Triassic index fossil Pleuromeia. Based on the flora similarity, the zircon dating, lithologic characteristics, presence of a disconformity, and the occurrence of the Middle Triassic–Early Cretaceous insect fossil Sogdoblatta, the age of the Linjia Formation can be confirmed as Middle Triassic. The new species not only supplements our knowledge in biology and taxonomy of Pleuromeia, but also supports the Middle Triassic age assignment of the Linjia flora.     

山西三叠系二马营组和铜川组SHRIMP锆石铀-铅年龄及其地质意义(英文)

采集了山西省二马营组和铜川组共4个层位的火山凝灰岩,在高灵敏度高分辨率二次离子质谱仪上以铀-铅法测定其中锆石的年龄。二马营组上部的样品测年结果为245.9 Ma±3.2 Ma, 铜川组一段样品测年结果为243.1 Ma±3.9 Ma, 二段上部两个样品年龄为238.6 Ma±2.6 Ma和234.6 Ma±6.5 Ma。结果表明出产陕北肯氏兽动物群的二马营组下部极有可能属于下三叠统,而铜川组时代可能从安尼期晚期到拉丁期。     

云南中三叠世(安尼期)预言鱼目(全骨鱼类:近鲱形类)一新属种

预言鱼目是近鲱形类的一个绝灭支系,被认为是弓鳍鱼目的姐妹群.预言鱼目化石过去主要发现于欧洲的中三叠世拉丁期和晚侏罗世地层以及新大陆的早白垩世地层.近年来,在云南和贵州的中三叠世安尼期地层中分别发现了一种预言鱼目鱼类化石(强壮鱼和盘县鱼),代表了该目在中国的首次发现.根据产于云南罗平中三叠世安尼期(～244 Ma)海相地层中的6块保存良好的鱼化石,命名了预言鱼目一个新的属种,三叠复兴鱼(Subortichthys triassicus gen.et sp.nov.).三叠复兴鱼是罗平生物群中发现的第二种预言鱼目鱼类,代表了预言鱼目最古老的化石记录之一,为研究该目的起源和早期分异提供了重要信息.复兴鱼无疑可以归入近鲱形类,因为它具有近鲱形类两个共近裔性状,续骨与下颌关节以及上颌骨后缘具有凹缺.分支分析结果表明,复兴鱼位于预言鱼目的基部,因为它具有该目的重要鉴定特征,上颌骨具有感觉管,但它不具有其他预言鱼目鱼类的进步特征.特别的是,复兴鱼具有一些独特的性状,如额外肩胛骨3或4对、第三眶下骨特别宽大并与前鳃盖骨前缘相接等.复兴鱼的发现表明预言鱼目鱼类在华南地区(三叠纪时期位于古特提斯洋的东部)的早期分异至少发生在中三叠世早期(安尼期).     

First Triassic record of the beetle family Permocupedidae (Insecta: Coleoptera): a peculiar example of a Lazarus taxon

The first Mesozoic representative of the extinct archostematan beetle family Permocupedidae, Frankencupes ultimus, gen. et sp. nov., is described based on two isolated elytra from the Lower Anisian (Middle Triassic) Röt Formation of Lower Franconia, Germany. The new fossil occurrence extends the range of the family from the Lower Wuchiapingian (Upper Permian) up to the Anisian, and represents a fine example of a Lazarus taxon in the fossil record of beetles.     

Middle Triassic basin evolution and stratigraphy in the Carnic Alps (Austria)

Summary A local intraplatform basin developed in the Gartnerkofel-Zielkofel area of the Carnic Alps (southern Carinthia, Austria) during the Middle Triassic (Ladinian). This basin was filled with a transgressive basinal sequence composed of the Uggowitz Formation and overlying Buchenstein Formation. At the northwestern slope of the Gartnerkofel, the platform carbonates of the Schlern Dolomite interfinger with the Buchenstein Formation, causing the formation of two depositional sequences. The Uggowitz Formation consists of the Uggowitz Breccia and the Kühweg Member. Sediments of the Uggowitz Breccia were formed by different types of gravity induced processes. The Kühweg Member is a thin sequence of silt-and fine-grained sandstones which were deposited in a slope to basin margin environment by turbidity currents. The overlying Buchenstein Formation consists of hemipelagic to pelagic limestones of Fassanian age with intercalated pyroclastic rocks (Pietra verde). Nodular limestones were deposited under slow rates of accumulation during a relative sea-level highstand. The uppermost Buchenstein Formation is composed of hemipelagic limestone beds with intercalated graded calcarenites and breccias of platform-derived debris, showing characteristics features of a fore-reef slope of the prograding Schlern Dolomite. Uggowitz Formation and basal Buchenstein Formation are interpreted as a transgressive systems tract, nodular limestones from the middle part of the Buchenstein Formation mark an early highstand systems tract, forereef slope sediments of the upper Buchenstein Formation formed during the beginning regression of a late highstand systems tract, the basal part of the overlying Schlern Dolomite probably reflects a lowstand systems tract. The intercalated bedded limestone facies within the Schlern Dolomite is characterized by large, platform derived blocks, slump structures, breccia beds, graded calcarenites and hemipelagic limestones indicating a forereef slope environent. This intercalated facies belongs to the Buchenstein Formation and interfingers with the Schlern Dolomite. Conodonts from this intercalated slope facies point to Late Fassanian age. Therefore, the two Middle Triassic depositional sequences of the Gartnerkofel area can be correlated with the depositional sequences ‘Ladinian 1’ and ‘Ladinian 2’ of the Dolomites, proposed byDe Zanche et al. (1993). A brief comparison with the basinal sequences of similar age of the karawanken Mountains and the Carnia is presented.     

中国肯氏兽-山西鳄组合带的新发现之三:山西临县的主龙型类

近几十年,华北的二马营组上部地层以产出中国肯氏兽-山西鳄四足动物化石组合而闻名.最近在山西临县白道峪于上覆的铜川组一段发现了中国肯氏兽.本文描述了同一地点同一层位产出的主龙型类化石,包括一具山西鳄的部分骨架以及一些可以归入suchian的主龙类.它们是铜川组一段首次记述的主龙型类.最有鉴定特征的suchian材料包括一个大的髂骨以及一个小的、形状很奇特的、可能是跟骨的骨骼.髂骨可能可以归入一个奇异的波波龙类(poposauroid).因为中国肯氏兽与山西鳄同时出现在白道峪,表明中国肯氏兽-山西鳄组合可以向上延伸到铜川组一段.髂骨与跟骨大小悬殊,可能代表两个从未在中国肯氏兽-山西鳄组合报道过的物种.白道峪发现了特化的波波龙类,支持了波波龙类在中三叠世大量分化的观点.     

陕西铜川中三叠世原直脉蝎蛉属（昆虫纲，长翅目）新化石

本原直脉蝎蛉化石标本采自陕西铜种中三叠世铜川组下段上部（T21^2)灰绿色泥页岩,中描述2个新种,并附上产于世界各地的10个种主要特征的检索表,新种的模式标本保存在北京自然博物馆。     

吐鲁番拗陷北部中侏罗世孢粉植物群

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-Psophosphaera-Cycadopite 组合、 Cyathidites-Quadraeculina-Classopollis 组合和 Cyathidites-Callialasporites-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.     

MIDDLE TRIASSIC NEW FOSSILS OF PROTORTHOPHLEBIA TILLYARD (INSECW: MECOPTERA) FROM TONGCHUAN REGION, SHAANXI PROVINCE, CHINA

Abstract  The new fossil specimens of Protorthphlebia Tillyd, 1933 collected from the Middle Triassic grayishgreen mudstone and shale of the Upper part of Lower Member, Middle Triassic Tongchuan Formation ( T ²_2t) in Tongchuan Shaanxi Province, China are reported and two new species Protorthophlebia ladinica sp.nov. and P. triassica sp.nov. are described. A key to 10 species of genus Rotorthphlebia is provided.