A new palaeoscolecid, Guanduscolex minor Hu, Luo et Fu gen. et sp. nov., with preserved soft parts of introvert and intestines comes from the Lower Cambrian Guanshan fauna of Yunnan, South China. Microstructural detai...A new palaeoscolecid, Guanduscolex minor Hu, Luo et Fu gen. et sp. nov., with preserved soft parts of introvert and intestines comes from the Lower Cambrian Guanshan fauna of Yunnan, South China. Microstructural details of the cuticle revealed by scanning electron microscopy （SEM） show that each annulation bears three rows of plates and each plate bears 9-10 marginal and 4-5 central nodes. This discovery sheds new light on the relationships and evolutionary pathway of the palaeoscolecids and other early priapulids.展开更多
Twenty black shale samples, which are free from the influence of weathering, were collected from the Chengjiang Fauna-bearing horizon, central Yunnan Province, yielding a Pb-Pb isochron age of 534±60 Ma. Although...Twenty black shale samples, which are free from the influence of weathering, were collected from the Chengjiang Fauna-bearing horizon, central Yunnan Province, yielding a Pb-Pb isochron age of 534±60 Ma. Although this age is younger than both the Rb-Sr isochron age and 40Ar-39Ar age, it should represent the lower isotopic age limit of the Chengjiang Fauna.展开更多
The Guanshan Fauna is a soft-bodied fauna dominated by arthropods （including trilobites, trilobitoides, Tuzoia, Isoxys, and bradorids） in association with priapulids, brachiopods, anomalocaridids, vetulicoliids, spo...The Guanshan Fauna is a soft-bodied fauna dominated by arthropods （including trilobites, trilobitoides, Tuzoia, Isoxys, and bradorids） in association with priapulids, brachiopods, anomalocaridids, vetulicoliids, sponges, chancellorids, and echinoderms. This paper reports and describes a new arthropod from the yellowish green mudstone at the lower part of the Wulongqing Formation, Canglangpuan Stage, Lower Cambrian in Kunming, Yunnan, China. The stratigraphic and geographic distribution, classification, fossil preservation, life style of this new arthropod and comparisons with other fossil arthropods are also discussed in details. The discovery and research of the non-mineralized arthropod, Guangweicaris Luo, Fu et Hu gen. nov. from the Guanshan Fauna adds new members to the taxonomic list and provides new information to the evolution of early arthropods. Furthermore, this study would shed new light into the ＂Cambrian Explosion＂ and the evolution of early life.展开更多
A plane-formed tourmalite is exposed, which has a transition belt with underlying tourmaline-albite-granite and has a distinct line as intrusive body with top countryrock (dimicaceous shist), in Amoshan Mountain of Xi...A plane-formed tourmalite is exposed, which has a transition belt with underlying tourmaline-albite-granite and has a distinct line as intrusive body with top countryrock (dimicaceous shist), in Amoshan Mountain of Ximeng County, Yunnan Province in which there is valuable tin. The tin deposit was regarded as the展开更多
This is a brief report of a new occurrence of eocrinoids from the Early Cambrian Wulongqing Formation in Yunnan, China. The eocrinoids from the Guanshan fauna are among the earliest known eocrinoids. Different from ma...This is a brief report of a new occurrence of eocrinoids from the Early Cambrian Wulongqing Formation in Yunnan, China. The eocrinoids from the Guanshan fauna are among the earliest known eocrinoids. Different from many other Early and Middle Cambrian eocrinoids, the Guanshan eocrinoids are char-acterized by the absence of sutural pores and epispires, the long and spiral brachioles, the extremely long stalk, and the ratio of the length of the stalk versus that of the calyx. The discovery of the eocri-noids from the Guanshan fauna not only provides new information to the investigation of the early evolution of this animal group, but also shed new light on the occurrence and migration of early eocrinoids.展开更多
Isotopic geochronology has long been confined to the determination of diagenesis age. Up to now, it is an open problem for determining the minerogenetic ages of a great many metallic deposits, rather than uranium.
To determine the Mesozoic and Cenozoic red rock series, volcanogenic intercalations in them have been taken for dating by geologists. But the validity of this method is limited because the intercalation does not occur...To determine the Mesozoic and Cenozoic red rock series, volcanogenic intercalations in them have been taken for dating by geologists. But the validity of this method is limited because the intercalation does not occur in all the red rock series. Thus, we try to use illite in red beds and red cements of some karst breccias near Guilin to determine their Rb-Sr isotopic ages. The results are promising.展开更多
This particular section represents a stratotype section for the Lower Cambrian Meishucunian Stage and is also a Chinese candidate for the global stratotype section and point for the Precambrian-Cambrian boundary. In J...This particular section represents a stratotype section for the Lower Cambrian Meishucunian Stage and is also a Chinese candidate for the global stratotype section and point for the Precambrian-Cambrian boundary. In January, 1984, having taken votes, the IUGS-IGCP Project 29 Working Group on Precambrian-Cambrian Boundary recommended the Meishucun section as a global展开更多
文摘A new palaeoscolecid, Guanduscolex minor Hu, Luo et Fu gen. et sp. nov., with preserved soft parts of introvert and intestines comes from the Lower Cambrian Guanshan fauna of Yunnan, South China. Microstructural details of the cuticle revealed by scanning electron microscopy （SEM） show that each annulation bears three rows of plates and each plate bears 9-10 marginal and 4-5 central nodes. This discovery sheds new light on the relationships and evolutionary pathway of the palaeoscolecids and other early priapulids.
基金This research project was granted jointly by the National Natural Science Foundation of China(Grant No.40073001)the Key Project(97D0072)of Yunnan Provincial Foundation.
文摘Twenty black shale samples, which are free from the influence of weathering, were collected from the Chengjiang Fauna-bearing horizon, central Yunnan Province, yielding a Pb-Pb isochron age of 534±60 Ma. Although this age is younger than both the Rb-Sr isochron age and 40Ar-39Ar age, it should represent the lower isotopic age limit of the Chengjiang Fauna.
基金This study was supported by the Major Basic Research Project of the Ministry of Science and Technology of China （No. 2002CCA03300） the National Natural Science Foundation of China （No. 40672004）+1 种基金 the National ＂973＂ Project （No. 2006CB806401）the jointproject between the Yunnan Institute of Geological Science and the Shenzhen Palaeontological Museum （No. YIGS- 2006-01）.
文摘The Guanshan Fauna is a soft-bodied fauna dominated by arthropods （including trilobites, trilobitoides, Tuzoia, Isoxys, and bradorids） in association with priapulids, brachiopods, anomalocaridids, vetulicoliids, sponges, chancellorids, and echinoderms. This paper reports and describes a new arthropod from the yellowish green mudstone at the lower part of the Wulongqing Formation, Canglangpuan Stage, Lower Cambrian in Kunming, Yunnan, China. The stratigraphic and geographic distribution, classification, fossil preservation, life style of this new arthropod and comparisons with other fossil arthropods are also discussed in details. The discovery and research of the non-mineralized arthropod, Guangweicaris Luo, Fu et Hu gen. nov. from the Guanshan Fauna adds new members to the taxonomic list and provides new information to the evolution of early arthropods. Furthermore, this study would shed new light into the ＂Cambrian Explosion＂ and the evolution of early life.
文摘A plane-formed tourmalite is exposed, which has a transition belt with underlying tourmaline-albite-granite and has a distinct line as intrusive body with top countryrock (dimicaceous shist), in Amoshan Mountain of Ximeng County, Yunnan Province in which there is valuable tin. The tin deposit was regarded as the
基金Supported by the Major Basic Research Project of Ministry of Science and Technol-ogy of China (Grant No. 2002CCA03300)the State Key Laboratory of Palaeo-biology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) (Grant No. 053110)
文摘This is a brief report of a new occurrence of eocrinoids from the Early Cambrian Wulongqing Formation in Yunnan, China. The eocrinoids from the Guanshan fauna are among the earliest known eocrinoids. Different from many other Early and Middle Cambrian eocrinoids, the Guanshan eocrinoids are char-acterized by the absence of sutural pores and epispires, the long and spiral brachioles, the extremely long stalk, and the ratio of the length of the stalk versus that of the calyx. The discovery of the eocri-noids from the Guanshan fauna not only provides new information to the investigation of the early evolution of this animal group, but also shed new light on the occurrence and migration of early eocrinoids.
基金Project supported by the National Natural Science Foundation of China
文摘Isotopic geochronology has long been confined to the determination of diagenesis age. Up to now, it is an open problem for determining the minerogenetic ages of a great many metallic deposits, rather than uranium.
文摘To determine the Mesozoic and Cenozoic red rock series, volcanogenic intercalations in them have been taken for dating by geologists. But the validity of this method is limited because the intercalation does not occur in all the red rock series. Thus, we try to use illite in red beds and red cements of some karst breccias near Guilin to determine their Rb-Sr isotopic ages. The results are promising.
文摘This particular section represents a stratotype section for the Lower Cambrian Meishucunian Stage and is also a Chinese candidate for the global stratotype section and point for the Precambrian-Cambrian boundary. In January, 1984, having taken votes, the IUGS-IGCP Project 29 Working Group on Precambrian-Cambrian Boundary recommended the Meishucun section as a global
