Podrobnosti záznamu

Název
    Chulitnacula, a new paleobiogeographically distinctive gastropod genus from Upper Triassic strata in accreted terranes of southern Alaska
Údaj o odpovědnosti
    Jiří Frýda, Robert B. Blodgett
Další názvy
    Chulitnacula, nový, paleobiogeograficky významný gastropodový rod ze svrchnotriasových vrstev srostlých teránů jižní Aljašky
Autor
    Blodgett, Robert B.
    Frýda, Jiří
Jazyk
    anglicky
Zdrojový dokument - seriál
    Journal of the Czech Geological Society
Svazek/č.
    Vol. 46, no. 3-4
Strany
    p. 299-306
Rok
    2001
Poznámky
    1 obr., 2 fot., 2 s.bibl.
    České resumé
    il.
    Zkr. název ser.: J. Czech geol. Soc.
Předmětová skupina
    Gastropoda
    nový taxon
    paleobiogeografie
    prostředí mělkovodní
    Protorculidae
    taxonomie
    terán
    trias-svrchní
Geografické jméno
    USA-Alaska
Klíčové slovo
    Accreted
    Alaska
    Chulitnacula
    Distinctive
    Gastropod
    Genus
    New
    Paleobiogeographically
    Southern
    Strata
    Terranes
    Triassic
    Upper
Abstrakt (anglicky)
   A new protorculid gastropod genus, Chulitnacula, is based on Protorcula alaskana Smith, 1927, from the Chulitna terrane of south-central Alaska. The type species also occurs in two other accreted terranes of southern Alaska: (1) in the Farewell terrane (Nixon Fork subterrane) of southwestern Alaska; and (2) in the Alexander terrane of southern Alaska. This taxon is a common to dominant element in shallow-water, near shore late Norian age strata of all of these terranes. It appears to be biogeographically significant in that while it so abundant in these southern Alaska accreted terranes, it is completely unknown elsewhere in Upper Triassic para-autochthonous rocks of western North America (i.e. Nevada, Sonora). The occurrence of Chulitnacula alaskana (Smith, 1927) in the Chulitna, farewell (Nixon Fork subterrane) and Alexander terranes suggests that they were in close reproductive communication in the Late Triassic.
   The absence of this taxon in either the Wrangellia terrane of southern Alaska and British Columbia, as well as in the related Wallowa terrane of northeastern Oregon and adjacent western Idaho is worthy of note. This absence plus many other major differences in their respective Late Triassic gastropod faunas indicate that the Chulitna-farewell-Alexander terrane association was far removed from the Wrangelia-Wallowa terrane couplet. While both faunal association are characteristically tropical in aspect, their biogeographically differing faunas indicate that they were probably very distantly separated from one another in the Panthalassa Ocean at this time
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    30. 5. 2007
Datum importu
    8. 8. 2012