Podrobnosti záznamu

Název
    The latest Ordovician Hirnantia Fauna (Brachiopoda) in time and space
Údaj o odpovědnosti
    Jia-Yu Rong, Xu Chen, David A.T. Harper
Autor
    Chen, Xu
    Harper, David A. T.
    Rong, Jia-Yu
Jazyk
    anglicky
Zdrojový dokument - seriál
    Lethaia
Svazek/č.
    Vol. 95, no. 3
Strany
    p. 231-249
Rok
    2002
Poznámky
    12 obr., 4 s. bibl.
    il.
    Zkr. název ser.: Lethaia
Předmětová skupina
    ashgill
    Barrandien
    Brachiopoda
    diachronismus
    llandovery
    ordovik
    pražská pánev
    silur
    stratigrafická hranice
    vymírání
    zóny biostratigrafické
Geografické jméno
    Argentina-San Juan
    Čína jihozápadní
    ČR-Čechy
    Kazachstán
    Polsko-Kielce
    Španělsko
    Thajsko
    Velká Británie
Klíčové slovo
    Brachiopoda
    Fauna
    Hirnantia
    Latest
    Ordovician
    Space
    Time
Abstrakt (anglicky)
   The diachronous temporal and spatial distribution of the Hirnantia brachiopod fauna and the complicated pattern of terminal Ordovician events are documented through biostratigraphical analysis of the Ordovician-Silurian boundary strata in S China, Sibumasu, Xizang and elsewhere. The duration of these events (longer than the half Myr derived fro isotopic excursions) indicates that they were not abrupt and instantaneous. The presence of some core taxa of the Hirnantia fauna in the upper P. pacificus Biozone (known from their earliest occurrence in China) signals the start of increased water ventilation due to the invasion of cool water across the Yangtze Basin. Low- and higher-diversity Hirnantia faunas related to onshore, shallow-water and to offshore, deeper-water environments, respectively, developed first in the basal and upper N. extraordinarius-N. ojsuensis Biozone. Disappearance of most of the fauna in the early N.
   persculptus Biozone suggests that the glacial maximum started to decline. The presence of the Hirnantia fauna in the upper N. persculptus to the loer P. acuminatus biozones indicates the continuation of cool water environments in some places. The diachronous disappearance of deteriorating environments (earlier in later Hirnantian and finally in the early Rhuddanian) is associated with geographical heterogeneity. Occurrences of atrypids, pentamerids and spiriferids along with key elements of the Hirnantia fauna in N Guizhou provide a link between the Late Ordovician radiation and Early Silurian recovery of these major brachiopod groups
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    2. 10. 2007
Datum importu
    8. 8. 2012