Following votes by the Barremian Working Group,the International Subcommission on Cretaceous Stratigraphy and the International Commission on Stratigraphy,the Executive Committee of the International Union of Geologic...Following votes by the Barremian Working Group,the International Subcommission on Cretaceous Stratigraphy and the International Commission on Stratigraphy,the Executive Committee of the International Union of Geological Sciences unanimously approved in March 2023 the Global Stratotype Section and Point(GSSP)for the Barremian Stage(Lower Cretaceous).The base of the Barremian Stage is defined at the base of bed 171 of the Río Argos section,near Caravaca(SE Spain)and correlated by the first appearance of the ammonite species Taveraidiscus hugii.This event falls within the NC5C calcareous nannofossil Subzone,the Lilliputianella semielongata planktonic foraminiferal Zone,and the Dorothia ouachensis benthic foraminiferal Zone.It roughly coincides with the beginning of a slightly negative trend interval in theδ^(13)C curve.Indirect calibration to the magnetostratigraphic scale suggests that the boundary falls in the lowermost part of polarity chron M3r.According to the astrochronological analysis,a time interval of 0.74 myr separates the beginning of the late Hauterivian Faraoni Episode from the base of the Barremian,which is dated at 125.77 MA.展开更多
Rudolf Trümpy,friendly known as Ruedi,was one of the most eminent and influential Alpine Geologists of the 20th century.During his long and productive career he received numerous honours including the Wollaston M...Rudolf Trümpy,friendly known as Ruedi,was one of the most eminent and influential Alpine Geologists of the 20th century.During his long and productive career he received numerous honours including the Wollaston Medal and the Penrose Medal for his pioneering work on paleogeography and nappe development in the Alps and his involvement in international activities culminating in the IUGS presidency(1976-1980).In 1978 he was elected a Foreign Associate of the United States National Academy of Sciences and in 1984 he became member of the French Academy of Sciences.展开更多
文摘Following votes by the Barremian Working Group,the International Subcommission on Cretaceous Stratigraphy and the International Commission on Stratigraphy,the Executive Committee of the International Union of Geological Sciences unanimously approved in March 2023 the Global Stratotype Section and Point(GSSP)for the Barremian Stage(Lower Cretaceous).The base of the Barremian Stage is defined at the base of bed 171 of the Río Argos section,near Caravaca(SE Spain)and correlated by the first appearance of the ammonite species Taveraidiscus hugii.This event falls within the NC5C calcareous nannofossil Subzone,the Lilliputianella semielongata planktonic foraminiferal Zone,and the Dorothia ouachensis benthic foraminiferal Zone.It roughly coincides with the beginning of a slightly negative trend interval in theδ^(13)C curve.Indirect calibration to the magnetostratigraphic scale suggests that the boundary falls in the lowermost part of polarity chron M3r.According to the astrochronological analysis,a time interval of 0.74 myr separates the beginning of the late Hauterivian Faraoni Episode from the base of the Barremian,which is dated at 125.77 MA.
文摘Rudolf Trümpy,friendly known as Ruedi,was one of the most eminent and influential Alpine Geologists of the 20th century.During his long and productive career he received numerous honours including the Wollaston Medal and the Penrose Medal for his pioneering work on paleogeography and nappe development in the Alps and his involvement in international activities culminating in the IUGS presidency(1976-1980).In 1978 he was elected a Foreign Associate of the United States National Academy of Sciences and in 1984 he became member of the French Academy of Sciences.
