Previous studies on deep modern benthic foraminifera in the Mediterranean Sea are not abundant and generally are focused at the fossilizing polythalamous component of the foraminiferal assemblages.We present prelimina...Previous studies on deep modern benthic foraminifera in the Mediterranean Sea are not abundant and generally are focused at the fossilizing polythalamous component of the foraminiferal assemblages.We present preliminary results of living(Rose Bengal stained)benthic foraminiferal faunas in bathyal and abyssal sediments.Benthic foraminiferal density, species composition and biomass are determined at 10 sites across a transect from the展开更多
Noeggerathiales are an extinct group of sporebearing plants of uncertain systematic position that are known from Carboniferous and Permian age Euramerican and Cathaysian floras that occurred in present-day Europe,Nort...Noeggerathiales are an extinct group of sporebearing plants of uncertain systematic position that are known from Carboniferous and Permian age Euramerican and Cathaysian floras that occurred in present-day Europe,North America,and East Asia.The order Noeggerathiales includes over 50 species of more than 20 fossil genera,but their paleoecology is not well understood yet.Previously this group had been found only in extrabasinal floras or those inhabiting clastic wetlands.Noeggerathiales have never been recorded in coal ball floras.Thus,it is up to now uncertain whether this group has contributed to the formation of coal.Recent investigations of an Early Permian peat-forming flora of the Taiyuan Formation near Wuda,Inner Mongolia,which was preserved in a volcanic ash fall has provided evidence that noeggerathialean plants not only existed in the peat-forming vegetation but could even be the dominant group in some areas of the coal swamp.The Noeggerathiales in this particular peat-forming forest include Tingia unita,Paratingia wudensis,and a new species of Paratingia.Exceptionally well-preserved specimens indicate that these noeggerathialean plants are small trees with a canopy of compound leaves and strobili near the top of an unbranched(monocaulous)stem.展开更多
In the Tarim Basin (in the Xinjiang Uygur Autonomous Region, Northwest China), the Frasnian-Famennian (F-F) boundary and boundary events within the Upper Devonian are revealed by applying the chemo-biostratigraphic me...In the Tarim Basin (in the Xinjiang Uygur Autonomous Region, Northwest China), the Frasnian-Famennian (F-F) boundary and boundary events within the Upper Devonian are revealed by applying the chemo-biostratigraphic method. At Bachu County, Tarim Basin, the F-F boundary is placed near the base of the Middle Member of the Bachu Formation. This result indicates that the important oil-reservoir bed, Donghe Sandstone, has an age no later than the Frasnian. Nickel anomalies and gypsum beds in the F-F boundary beds might have an origin of rifting-hydrothermal process.展开更多
The base of the Quaternary System is defined by theGlobal Stratotype Section and Point(GSSP)of theGelasian Stage at Monte San Nicola in Sicily,Italy,currently dated at 2.58 Ma.The base of the PleistoceneSeries is rede...The base of the Quaternary System is defined by theGlobal Stratotype Section and Point(GSSP)of theGelasian Stage at Monte San Nicola in Sicily,Italy,currently dated at 2.58 Ma.The base of the PleistoceneSeries is redefined by the same GSSP,having previouslybeen defined by the GSSP at Vrica,Calabria,Italy,whichis dated at 1.806 Ma.These important changes to thegeological time scale were formulated through extensiveconsultation with the Quaternary community throughthe International Union for Quaternary Research(INQUA),proposed by the International Commission onStratigraphy’s(ICS)Subcommission on QuaternaryStratigraphy,endorsed by the voting membership of theICS,and ratified in June 2009 by the Executive Committeeof the International Union of Geological Sciences.Twocompeting proposals had been advanced:a‘Neogene’proposal advocated by the ICS Subcommission on NeogeneStratigraphy,and a‘Quaternary’proposal championedby the ICS Subcommission on Quaternary Stratigraphy.The status quo position would have persisted hadneither proposal received a majority of votes.Theseproposals are compared and evaluated,the‘Quaternary’proposal is presented in detail,and future directions arediscussed.展开更多
文摘Previous studies on deep modern benthic foraminifera in the Mediterranean Sea are not abundant and generally are focused at the fossilizing polythalamous component of the foraminiferal assemblages.We present preliminary results of living(Rose Bengal stained)benthic foraminiferal faunas in bathyal and abyssal sediments.Benthic foraminiferal density, species composition and biomass are determined at 10 sites across a transect from the
基金supported by the Chinese Academy of Science Project (KZCX2-EW-120)the National Basic Research Program of China (2012CB821901)+1 种基金the National Natural Science Foundation of China (41072010,41172006,41372011)a grant from the University Research Foundation of the University of Pennsylvania
文摘Noeggerathiales are an extinct group of sporebearing plants of uncertain systematic position that are known from Carboniferous and Permian age Euramerican and Cathaysian floras that occurred in present-day Europe,North America,and East Asia.The order Noeggerathiales includes over 50 species of more than 20 fossil genera,but their paleoecology is not well understood yet.Previously this group had been found only in extrabasinal floras or those inhabiting clastic wetlands.Noeggerathiales have never been recorded in coal ball floras.Thus,it is up to now uncertain whether this group has contributed to the formation of coal.Recent investigations of an Early Permian peat-forming flora of the Taiyuan Formation near Wuda,Inner Mongolia,which was preserved in a volcanic ash fall has provided evidence that noeggerathialean plants not only existed in the peat-forming vegetation but could even be the dominant group in some areas of the coal swamp.The Noeggerathiales in this particular peat-forming forest include Tingia unita,Paratingia wudensis,and a new species of Paratingia.Exceptionally well-preserved specimens indicate that these noeggerathialean plants are small trees with a canopy of compound leaves and strobili near the top of an unbranched(monocaulous)stem.
基金the National Natural Science Foundation of China(Grant No.49972015) the Research Fund for the Doctoral Program of Higher Education of the Education Ministry of China.
文摘In the Tarim Basin (in the Xinjiang Uygur Autonomous Region, Northwest China), the Frasnian-Famennian (F-F) boundary and boundary events within the Upper Devonian are revealed by applying the chemo-biostratigraphic method. At Bachu County, Tarim Basin, the F-F boundary is placed near the base of the Middle Member of the Bachu Formation. This result indicates that the important oil-reservoir bed, Donghe Sandstone, has an age no later than the Frasnian. Nickel anomalies and gypsum beds in the F-F boundary beds might have an origin of rifting-hydrothermal process.
文摘The base of the Quaternary System is defined by theGlobal Stratotype Section and Point(GSSP)of theGelasian Stage at Monte San Nicola in Sicily,Italy,currently dated at 2.58 Ma.The base of the PleistoceneSeries is redefined by the same GSSP,having previouslybeen defined by the GSSP at Vrica,Calabria,Italy,whichis dated at 1.806 Ma.These important changes to thegeological time scale were formulated through extensiveconsultation with the Quaternary community throughthe International Union for Quaternary Research(INQUA),proposed by the International Commission onStratigraphy’s(ICS)Subcommission on QuaternaryStratigraphy,endorsed by the voting membership of theICS,and ratified in June 2009 by the Executive Committeeof the International Union of Geological Sciences.Twocompeting proposals had been advanced:a‘Neogene’proposal advocated by the ICS Subcommission on NeogeneStratigraphy,and a‘Quaternary’proposal championedby the ICS Subcommission on Quaternary Stratigraphy.The status quo position would have persisted hadneither proposal received a majority of votes.Theseproposals are compared and evaluated,the‘Quaternary’proposal is presented in detail,and future directions arediscussed.
