贵州剑河巴水崖、镇远朱砂凯里组研究--八郎潜在的国际中、下寒武统层型剖面的辅助剖面研究

贵州剑河县巴水崖和镇远县朱砂凯里组剖面中下部都有Oryctocephalus indicus的产出，说明Oryctocephalus indicus的分布具有普遍性。两个剖面中、下寒武统界线的划分和潜在的八郎鸟溜剖面中、下寒武统界线候选层型剖面的划分基本一致，可作为潜在的八郎鸟溜中、下寒武统层型剖面的辅助剖面。     

贵州黔东南中,下寒武统凯里组下部Redlichia的发现及意义

本文描述了贵州黔东南中，下凯里组下部Ｒｅｄｌｉｃｈｉａ的两个新亚各Ｒｅｄｌｉｃｈｉａ及Ｒ．（Ｒ．）和一个未定种Ｒｅｄｌｉｃｈｉａ（Ｒｅｄｌｉｃｈｉａ）ｓｐ．，并讨论了Ｒｅｄｋｉｃｈｉａ在中下寒武统界线划分对比的作用及意义。     

全球中、下寒武统界线研究现状及展望

美国、中国、摩洛哥、俄罗斯、西班牙等国的地层古生物学者均在进行中、下寒武统界线层型剖面及标准点(GSSP)的研究,并相继提出潜在的中寒武统FAD分子如Oryctocephalus indicus,Ovatoryctocara granulata, Acadoparadoxides mureroensis, Hupeolenus和Arthricocephalus chauveaui及潜在中、下寒武统界线层型剖面.早及中寒武世之交,广泛分布的三叶虫极少,能够作全球完美的中寒武统FAD分子至今几乎没有.Oryctocephalus indicus分布比较广泛,三大生物区均有产出,特征明显.首现点正好是三叶虫大量灭绝、新的三叶虫大量出现的演化点,是一个相对最佳的中寒武统FAD分子.而中国台江八郎乌溜剖面岩性单一且连续,底栖及游泳的三叶虫非常丰富.Oryctocephalus indicus首现点距Redlichia、Bathynotus灭绝点分别是0.8及1.2m,处于三叶虫的重要演化阶段.疑源类的演化及微量元素、碳同位素变化特征和中、下寒武统界线划分一致或基本一致.界线之上为著名的中寒武世凯里生物群,剖面点距320国道仅5km,是一个潜在的、好的中、下寒武统界线层型剖面.     

贵州黔东地区中-下寒武统凯里组发育特征

贵州黔东地区中－下寒武统凯里组主要由粉砂质泥岩，页岩及灰岩组成，富产三叶虫，其中台江八郎乌溜－曾家岩的凯时组含著名的中寒武世凯里生物群、早寒武世台江生物群，2001年成为国际中－下寒武统层型界线候选部，对其深入研究具有重大科学和实用意义。就我省黔东地区凯里组的岩石地层，生物地层，年代地层，沉积环境等进行研究及总结，亦确认黔东凯里组是一个十分重要的地层单位。     

贵州台江早寒武世台江动物群的发现及意义

贵州台江八郎凯里组剖面中下部中、下寒武统界线之下厚达１５米左右的粉砂质泥岩、页岩中存在着一个类似凯里动物群的台江动物群,由８个门类３９个属组成,核心为蠕形动物,三叶虫数量很多。形成于内陆棚浅海环境。时代为早寒武世末期,介于著名的早寒武世早期澄江动物群和中寒武世早期凯里动物群之间,对于早期后生动物的演化研究具有重要的意义。     

对云南晋宁梅树村震旦系-寒武系界线层型(候选)剖面的一些新认识

本文介绍了全球范围内当前已知的前寒武系-寒武系界线层型候选剖面中最优秀的云南晋宁梅树村剖面的最新研究材料。认为该剖面小歪头山段与下伏白岩哨段岩性甚为接近,两者应予合并。梅树村阶进一步划分出来的各亚组合带不能成立。许多材料都说明白岩哨段顶部和大海段顶部均有短期沉积间断。梅树村剖面前寒武系-寒武系界线点选择在“B”点,也即Anabarites trisulcatus组合带与Paragloborilus subglobosus组合带分界点上最合适。     

凯里动物群中Scenella的再研究

研究了贵州台下中寒武统凯里组产出的凯里动物群中的Ｓｃｅｎｅｌｌａ，据其形态，构造及保存特征，认为Ｓｃｅｎｅｌｌａ应属单板类。指出其与毛家仁等（１９９４）所定的Ｓｃｅｎｅｌｌａ ｒａｄｉａｎｓ Ｂａｂｃｏｃｋ ｅｔ ｒｏｂｉｓｏｎ 及Ｂａｂｃｏｃｋ和Ｒｏｂｉｓｏｎ（１９８８）定的Ｓｃｅｎｅｌｌａ ｒａｄｉａｎｓ Ｂａｂｃｏｃｋ ｅｔ Ｒｏｂｉｓａｎ有所区别，据此建立一新种。     

川北曾家地区二叠纪──早三叠世地层学研究

川北曾家地区二叠纪－早三叠世的生物地层研究表明，该区二叠系有４个生物带：Ｎａｎｋｉｎｅｌａｌａｔａ－Ｐｉｓｏｌｉｎａｓｔａｆｆｅｌｉｎｏｉｄｅｓ组合带，Ｎｅｏｓｃｈｗａｇｅｒｉｎａ－Ｖｅｒｂｅｅｋｉｎａｖｅｒｂｅｅｋｉ组合带，Ｃｏｄｏｎｏｆｕｓｉｅｌａ－Ｒｅｉｃｈｅｌｉｎａｃｈａｎｇｈｓｉｎｇｅｎｓｉｓ组合带和Ｐｓｅｕｄｏｔｉｒｏｌｉｔｅｓ－Ｃｈａｏｔｉａｎｏｃｅｒａｓ组合带；下三叠统也有４个生物带：Ｃｌａｒａｉａｗａｎｇｉ－Ｏｐｈｉｃｅｒａｓ组合带，Ｃｌａｒａｉａａｕｒｉｔａ－Ｃｌａｒａｉａｓｔａｃｈｅｉ组合带，Ｅｕｍｏｒｐｈｏｔｉｓｍｕｌｔｉｆｏｒｍｉｓ－Ｅｎｔｏｌｉｕｍ组合带和Ｔｉｒｏｌｉｔｅｓ组合带。在此基础上，结合火山沉积事件、沉积物注入和分布的明显变化及陆上暴露标志等的研究，建立了该区二叠系－下三叠统层序地层格架，划分出７个层序，并分析了相应的环境演变和不同的构造背景     

四川峨眉高桥震旦系——寒武系界线

四川峨眉高桥震旦系—寒武系界线剖面构造简单,沉积连续,化石丰富,是我国研究震旦系与寒武系界线重要剖面之一。本文系统地介绍了峨眉山地区震旦系—寒武系的研究历史,剖面详细分层及岩性和生物特征。论述了本区晚震旦世至早寒武世初期沉积环境的变迁、生物演化及震旦系—寒武系界线划分。本文以首次多门类带壳动物的大量出现作为划分震旦系与寒武系界线的主要依据。寒武系的下界划分在麦地坪组下部以小壳动物Anabarites—Circotheca为代表的化石组合的底界上,并与国内外相当时代的地层及界线进行了对比。     

苏皖地区孤峰组放射虫动物群及其古环境意义

苏皖地区下二叠统孤峰组４条剖面中含有极其丰富的放射虫化石，经鉴定计９属２７种，它们主要由阿尔拜虫类ａｌｂｉｌｌｅｌｌｉｄｓ，球形多囊虫类ｓｐｈｅｒｉｃａｌ ｐｏｌｙｃｙｓｔｉｎｅ和十字多囊虫类ｓｔａｕｒａｘｏｎ ｐｏｌｙｃｙｓｔｉｎｅ组成，并且可以划分成３个组合带，即Ｐｓｅｕｄｏａｌｂａｉｌｌｅｌｌａ ｆｕｓｉｆｏｒｍｉｓ－Ｐ．ｌｏｎｇｔａｎｅｎｓｉｓ，Ｆｏｌｌｉｃｕｃｕｌｌｕｓ ｍｏｎａｃａｎｔ     

Proposal and prospects for the global Lower-Middle Cambrian boundary

In recent years paleontologists have been working on the global stratotype section and standard point (GSSP) for the Lower-Middle Cambrian boundary in North America, China, Morocco, Spain and Russia. Continually, they suggest the potential first appearance datum (FAD) of the Middle Cambrian, such as Oryctocephalus indicus, Ovatoryctocara granulata, Acadoparadoxides mureroensis, Hupeolenus and Arthricocephalus chauveaui as being relevant to the potential stratotype section for the Lower-Middle Cambrian boundary. There are only a few trilobites distributed widely enough in the Early to Middle Cambrian connection, so virtually no trilobite(s) can act as the FAD for the global Middle Cambrian. The easily identified Oryctocephalus indicus is widely distributed in three realms of the global Cambrian. Its first appearance position is linked to the extinction of old species coevolution of new ones. It appears to be a comparatively good FAD of Middle Cambrian. The continuous and unbroken Wuliu section (Balang, Taijiang County, Guizhou Province, China) includes O. indicus and co-occurs with many benthic and nektonic trilobites. The evolution of acritarchs in the section, the changed characteristics of trace elements (REE and C isotopes) are generally consistent with the evolution of trilobites both above and below the boundary. Strata above the boundary yield the famous Kaili Biota. The Wuliu section is easily accessible from a main highway.     

Bathynotus: A key trilobite taxon for global stratigraphic boundary correlation between Cambrian Series 2 and Cambrian Series 3

The Cambrian trilobite Bathynotus is a special morphology of Redlichiid,which is characterized by a wider thorax axis and an 11th macropleural segment bearing a long,backwardly directed spine.Additionally,its 12th and 13th pleural segments are narrow and they terminate at a fulcrum where they fuse together and to the posterior edge of the long macropleural spine.The genus is widely distributed,occurring in North America,Siberia,the Altay-Sayan fold belt of Russia,South China,the Tarim Basin of China,and Australia.It occurs primarily in deposits of the upper part of the continental slope,at the transition between stable platform settings and subsiding margins of the late Early Cambrian.Here,we recognize three species of Bathynotus from China,including B.holopygus which is widespread around the world.Although six species of Bathynotus have been reported from Siberia and the Altay-Sayan fold belt area of Russia,data presented here suggest that only three of these species are valid.Bathynotus exhibits a short geological range,with its first occurrence late in the unnamed Cambrian Series 2 and the last appearance datum of Bathynotus at the boundary of Cambrian Series 2 and Cambrian Series 3.The late appearance datum (LAD) of Bathynotus provides an important global stratigraphic marker of the boundary between Cambrian Series 2 and Cambrian Series 3.     

Bathynotus --A key trilobite taxon? for global stratigraphic boundary correlation between Cambrian Series 2 and Series 3

The Cambrian trilobite Bathynotus is a special morphology of Redlichiid, which is characterized by a wider thorax axis and an 11th macropleural segment bearing a long, backwardly directed spine. Additionally, its 12th and 13th pleural segments are narrow and they terminate at a fulcrum where they fuse together and to the posterior edge of the long macropleural spine. The genus is widely distributed, occurring in North America, Siberia, the Altay-Sayan fold belt of Russia, South China, the Tarim Basin of China, and Australia. It occurs primarily in deposits of the upper part of the continental slope, at the transition between stable platform settings and subsiding margins of the late Early Cambrian. Here, we recognize three species of Bathynotus from China, including B. holopygus which is widespread around the world. Although six species of Bathynotus have been reported from Siberia and the Altay-Sayan fold belt area of Russia, data presented here suggest that only three of these species are valid. Bathynotus exhibits a short geological range, with its first occurrence late in the unnamed Cambrian Series 2 and the last appearance datum of Bathynotus at the boundary of Cambrian Series 2 and Cambrian Series 3. The late appearance datum (LAD) of Bathynotus provides an important global stratigraphic marker of the boundary between Cambrian Series 2 and Cambrian Series 3.     

New data regarding acritarch biostratigraphy from the Early-Middle Cambrian Kaili Formation in Chuandong, Guizhou Province, China

Previous studies have evaluated acritarchs from the Balang and Pingzhai sections of the Early-Middle Cambrian Kaili Formation in east Guizhou, China. The results of these studies suggest that the acritarchs in these sections have potential biostratigraphic significance. More recently, 34 samples collected from 83m lower part of the Lower-Middle cambrian Kaili Formation in the Jianshan section of Chuandong, Guizhou Province were prepared for palynological analysis. Analysis of these samples revealed a distinct change in the acritarch assemblages at the bed, which was approximately 46m above the bottom of the Kaili Formation. These findings suggest a boundary represented by an important alteration of the ecological environment. In addition, the position of the acritarch biostratigraphic change is somewhat higher than the boundary between Cambrian Series 2 and Series 3 based on trilobites found in the same section. This indicates that the distinct change in acritarch assemblages is similar to the change in trilobite assemblages that occurs around the boundary between Cambrian Series 2 and Series 3. Therefore, acritarch biostratigraphy can provide data that can be used to define the base of Cambrian Series 3 in this region, and possibly worldwide.     

扬子地台早寒武世早期小壳动物的古生态及其生物分区初探

文章讨论了早寒武世早期小壳动物的生存条件及几类常见软舌螺(Microcornus, Actinotheca, Neogloborilus, Paragloborilus, Adyshevitheca, Sulcavitus等)的生活环境及生存方式,并在古生态分析的基础上,对扬子地台早寒武世早期小壳动物的地理分区进行了探讨,提出扬子地台自西向东可分为三个不同的生物地理区,即底栖生物区;浮游、游泳、底栖生物混生区;浮游、游泳动物区。其分区界线大致与三叶虫的分区界线相吻合。     

Provincialism of the late Middle through middle Late Cambrian paraconodonts and protoconodonts

Quantitative paleoprovincialism is studied, using a coefficient of similarity (CS) formula. The results indicate that the provincialism of the late Middle through middle Late Cambrian paraconodonts and protoconodonts did exist. The provincialism of Ordovician conodonts can be traced back to late Middle Cambrian. The North China Province and South China Province can be recognized in late Middle Cambrian, whereas the North China Province, South China Province and Balitca Province can be recognized respectively in early Late Cambrian and middle Late Cambrian. The possibility that the larger units of provincialism, i.e. Faunal Regions existed in the areas mentioned above is discussed. It is inferred that the Midcontinent Faunal Region and the Atlantic Faunal Region had existed in early Late Cambrian and middle Late Cambrian. The North China Province was the secondary unit of provincialism in the Midcontinent Faunal Region, while the Baltica Province was that in the Atlantic Faunal Region. The South China Province is the secondary unit of provincialism between the two largest units of provincialism. Moreover, the comparison with the trilobite provincialism which has been accumulated on a solid basis of research is made, and the paleogeographic positions of North China Massif, South China Massif and Tarim Massif are revised.     

前寒武纪的划分

本文采用尹赞勋提出的地球历史发展的两大阶段:天文时期与地质时期,并同意废弃隐生宙与显生宙。本文着重讨论了生物的发展,从无机到有机,到蛋白质,到细胞,到后生动物的阶段性。建议地质时期代的划分,根据生物发展阶段特征,前寒武纪划分为无生代、隐生代、始生代与原生代。另把古生代下限延至900Ma,包括震旦纪。小壳动物应归属震旦纪,而不是寒武纪。     

扬子地区寒武系油气藏地质条件

中国扬子地区是一个元古代末形成的克拉通地区。将沉积学和构造地质学相结合,对扬子地区寒武系的油气地质条件进行了研究。研究结果表明,扬子地区寒武系是中国南方古生界最好的烃源岩发育层系之一,又具有较为理想的生储盖组合系列及油气保存条件,是中国南方古生界油气勘探的重要目的层系     

A restudy of Oryctocephalus indicus (Reed, 1910)

Restudy on morphology of Oryctocephalus indicus (Reed, 1910), based on specimens from Guizhou, China and Nevada USA, suggests that the subspecies regarded previously as Oryctocephalus indicus indicus (Reed, 1910), O. indicus latus Zhao et Yuan 2002, and O. indicus kobayashi Saito, 1934, are synonymous, and Oryctocephalus americanus Sundberg et McCollum, 2003 is a similar form of O. indicus. Oryctocephalus indicus is rediagnosed as having a glabella that is subconical in outline and tapering forward slightly; a thorax that comprises 12 segments, and a small pygidium that bears 2?3 axial rings with a terminal piece and a postaxial ridge. Oryctocephalus indicus is widely distributed in eastern Guizhou and ranges through a great interval of Kaili Formation. Its first appearance is almost identical with these events of trilobite extinction-recovery occurring at the end of the Early Cambrian, the alternation of acritach assemblages, the change of trace elements (REE) and stable isotopes (carbon) at the Wuliu-Zengjiaya section. As one of the key forms for defining the traditional Lower - Middle Cambrian boundary (the base of Cambrian Series 3 and Stage 5 in the new Cambrian chronstratigraphic standard), O. indicus has received detailed study and has more advantages than other species such as Ovatoryctocara granulata Tchernysheva, 1962 or Arthricocephalus chauveaui Bergeron, 1899.