内蒙古大青山地区早古生代三叶虫的发现

述描述了采自内蒙古大青山地区以断块状分布的白云岩、白云质灰岩中的三叶虫化石 3个属、2个种和 2个未定种。即LuaspideslingyuanensisDuan ,L .sp .,Manohuriellamacar(Walcott)和Pseudasaphussp .。虽然它们均是已知属种 ,但在该地区是首次发现。由此可以确定这套以角度不整合覆盖于古老变质岩之上的白云岩、白云质灰岩为主的沉积地层其层位属下古生界 ,时代最晚为毛庄期开始沉积。该发现解决了该套地层时代的归属问题 ,同时对于区内古生界和元古界划分对比具有重要意义。     

吉林南部晚寒武世凤山期三叶虫化石群落与沉积环境分析

吉林南部晚寒武世凤山期地层出露良好，三叶虫化石丰富，是进行化石群落古生态研究的理想地区。通过埋藏学分析、化石形态功能分析、围岩沉积学研究，在本区建立了六个底栖三叶虫化石群落，自下而上为Ｐｔｙｃｈａｓｐｉｓ－Ｔｓｉｎａｎｉａ群落，Ｑｕａｄｒａｔｉｃｅｐｈａｌｕｓ群落，Ｃｈａｎｇｉａ群落，Ｃａｌｖｉｎｅｌａ群落，Ｍｉｃｔｏｓａｕｋｉａ群落，Ｒｉｃｈａｒｄｓｏｎｅｌａ群落，结合化石群落及其赋存岩性特征，分析本区凤山期沉积环境由前滨－近滨相带渐变为浅海陆棚相带，海水逐渐加深。     

Late Permian-Early Triassic Conodont Biofacies and Bioprdvinces in South China and Himalaya1

Abstract On the basis of existing conodont data, the authors have studied the Late Permian-Early Triassic cohodonts of different farms and biofacies in detail Five conodont biofacies are recognised, from shallow to deep water: 1. Hindeodus conodont biofacies 2. Pachycladina-Parachi rognathus conodont biofacies, 3. Gondolella-Hindeodus Conodont biofacies, 4. Gondolella - Neospathodus conodont biofacies, and 5. Xaniognathus cohodont biofacies. Considering the temporal and spatial changes of these conodont biofacies, 3 conodont bioprovinces have been divided. In light of the biofacies changes of each bioprovince, the authors also discuss, in this paper, the regularity of transgression-regression cycles of eastern Tethys and their possible relation to the mass biotic alternation.     

中国奥陶纪三叶虫生物地理

三叶虫证据表明,除北疆区的阿尔泰地体和兴安区的额尔古纳-兴安地体与西伯利亚和劳伦陆块在动物群方面紧密关联外,中国奥陶纪的所有板块和大部分地体均系当时东泛冈瓦纳的重要组成部分,在生物地理上彼此密切相关。对这些属于东泛冈瓦纳的中国区块的台地或内陆棚三叶虫动物群的综合分析研究证明,它们在特马豆克期（Tremadocian）以及凯迪晚期-赫南特期（late Katian-Hirnantian）或阿石极期（Ashgill）应归属同一生物地理区,而在弗洛期-凯迪早期（Floian-early Katian）或阿仑尼克期-卡拉多克期（Arenig-Caradoc）则可划分为两个生物地理亚区：一个由华南、塔里木板块和安南或印支地体组成,另一个包括华北板块以及滇缅马、藏南、中天山-北山地体（可能还有海南地体）。饶有趣味的是在凯迪晚期或阿石极期开始发生的生物地理亚区解体之前,有关陆块的深水相三叶虫动物群已经历了从达瑞威尔中期（mid Darriwilian）至凯迪早期的长期频繁交流以及组成逐渐趋于齐一的过程。因此深水动物群之间的属种交流和一体化进程的发生、发展和完成显然均先于浅水一侧的三叶虫。     

新疆喀喇昆仑山奥陶纪几种三叶虫

喀喇昆仑山基本上属于地质空白区.1982年新疆地质矿产局区调大队四分队所采获的三叶虫等化石,描述了9属9种,其中5个新种,3个未定种,化石组合可以分为三个化石带:3.Lituites带;2.Ptychopyge-Chislioceras-Dideroceras带;1.Psilocephalina-Yinjiangia带.属于扬子型动物群.     

新疆阿尔金山奥陶纪三叶虫的发现

本文对阿尔金山所发现的奥陶纪三叶虫化石12属、13种,其中8个新种作了详细描述和对比,根据三叶虫、头足类、笔石等对本区奥陶纪地层的划分作了探讨.笔者认为:环形山组的时代为中奥陶世早-中期,相当于新疆柯坪萨尔干组;额兰塔格组属早奥陶世中-晚期,可与华北下马家沟组,华南大湾组,北美白石组,西昆仑库维希组进行对比;尧勒萨依组应划归下奥陶统;拉配泉群应为中—上奥陶统.     

华南上扬子区中奥陶统十字铺组的岩相与生物相

华南上扬子区中奥陶统十字铺组是跨越达瑞威尔阶中上部到桑比阶底部的一个岩石地层单位,自命名以来,许多学者对其进行过研究报道,但迄今缺乏系统综述。通过查阅大量相关资料并结合野外观察和研究,对十字铺组的岩相和生物相进行了总结:十字铺组以发育一套钙质泥岩夹有少量泥质灰岩并产有丰富的华美正形贝动物群为特色;在靠近古陆的上扬子台地西部,十字铺组的同期地层类型多样,主要为碎屑岩;而向东,在距古陆较远的地区,发育着岩相稳定的碳酸盐岩,以牯牛潭组为主。十字铺组及其同期地层中的腕足类化石,在黔北、黔东北及川西南等地的多样性较高,而向其他方向(更近岸或更远岸)多样性都呈下降的趋势。     

副蝴蝶虫(Parablackwelderia)在山东的发现及其地层学意义

在山东莱芜-新泰地区盘车沟剖面固山组底界上下首次发现了副蝴蝶虫(Parablackwelderia).研究表明Parablackwelderia是独立的属,而非Blackwelderia的晚出异名.长期以来,作为我国华北寒武纪崮山组和崮山阶(期)的标准地区,山东的崮山组被认为与崮山阶完全相当,这个认识在莱芜-新泰地区需...     

Middle and Late Cambrian trilobite communities from Fenghuang (Dama) of western Hunan, China

Middle and Late Cambrian trilobite faunas from the Dama section in western Hunanare are composed of 63 genera and subgenera, 84 species, and two forms of gen. et sp. indetermined. Which include a mixture of cosmopolitan agnostoids and polymeroids. Three new species,Hardyoides damaensis,Meringaspis damaensis and Rhyssometopus (Rodtrifinis) nitidus, are described by present author in 2004. Besides, Erixanium is recognised for the first time in study area, which is significant for biostratigraphical correlation of the Late Cambrian in the Austalo-Asia region. According to distribution regularity vertical, the Middle and Late Cambrian trilobites can be divided into 9 trilobite communities for the Dama section. Based on the trilobite communities analysis, the author concludes that from the east Mt. Lailong to Dama through Fenghuang, further east, reach in Chenxi,the palaeoenvironments were changed from a shallow-water of oxygen-rich (platform margin slope ) into a deep-water of oxygen-poor setting (basin).     

Stratigraphy and ecostratigraphic distribution of foraminiferal morphogroups from the Upper Jurassic of the Makar’yev section (Unzha River,Volga River basin)

Investigation of the Upper Callovian to Lower Kimmeridgian microfossils from the Makar’yev reference section (Unzha River, East European Platform) has been carried out. The section is characterized by ammonite debris and abundant associations of benthic and planktic foraminifers. It is a perfect object for stratigraphic and paleoecological researches. The biostratigraphic distribution of foraminifers from the Makar’yev section allows one to identify standard foraminifera zones of the East European Platform, as well as to upgrade some of them. The analysis of vertical and lateral ammonites and foraminiferal distribution, completed with litho stratigraphy, has precised the stratigraphic volume and position of boundaries of several lithological units.An improved stratigraphic scheme for the Kostroma area of the Moscow Depression is proposed. Analysis of the composition, structure, and dynamic changes of the foraminiferal assemblages has been performed. The morphofunctional analysis of foraminiferal genera has for the first time identified how foraminiferal morphogroups differing in their life style and feeding strategy varied with short-term paleoenvironmental changes. These morphogroup changes allow establishing four ecostratigraphic levels. These paleoecological data have been calibrated along with geochemical factors. They have shown a crisis of foraminiferal association during the Late Oxfordian and Early Kimmeridgian. A similar crisis has also been discovered in the north of Siberia, which may be an argument for its global distribution. The analysis of the taxonomic composition and the density of foraminiferal associations, in parallel with the structure of the association, has revealed a succession of transgressive and regressive events during the Late Callovian-Early Kimmeridgian. It allows the typification of each assemblage in relation with each event and underlines the occurrence of second-order sea-level fluctuations (middle part of the Middle Oxfordian and the earliest Kimmeridgian).