Record details

Title
    Early Aptian ammonites from the top of the Maiolica and the anoxic "Selli level" (Lombardy, Southern Alp)
Statement of responsibility
    Giovanni Landra, Fabrizio Cecca, Zdeněk Vašíček
Other titles
    Ammoniti dell' Aptiano inferiore dal To p della Maiolica e dal "livello Selli" (Lombardia, Alpi meridionali)
Author
    Cecca, Fabrizio
    Landra, Giovanni
    Vašíček, Zdeněk
Language
    anglicky
Source title - serial
    Bollettino della Societa Paleontologica Italiana
Vol./nr.
    Vol. 39, no. 1
Pages
    p. 29-45
Year
    2000
Notes
    3 obr., 2 pl., 3 s.bibl.
    il.
    Italské resumé
    Zkr. název ser.: Boll. Soc. paleont. ital.
Subject group
    Ammonoidea
    apt
    břidlice černá
    křída
    popis taxonů
    prostředí anoxické
    sedimenty karbonátové
Geographical name
    Itálie severní
Keyword
    Alp
    Ammonites
    Anoxic
    Aptian
    Early
    Level
    Lombardy
    Maiolica
    Selli
    Southern
    Top
Abstract (in english)
   The paper deals with the decription of Early Cretaceous ammonite faunas black shale layers intercalated within the transition between the Maiolica limestones and the marks of the Marne di Bruntino Formation in a quarry near Cesana Brianza (Como province, Northern Italy). For the first time in Italy ammonites have been collected also in the regional equivalent of the "Livello Selli", corresponding to the oceanic anoxic event OAE 1a. The ammonites studied have been asigned to the Early Aptian by means of integrated bio- and magnetostratigraphy. In fact, ammonite biostratigraphic markers are scarce in a distal Mediterranean area such as the Lombardy basin because of the evolutionary stasis in the majority of the groups and the rarity of representatives of the family Deshayesitidae; the latter are absent at Cesana Brianza. From a palaeoecological point of view, most of the studied ammonites had apparently a pelagic mode of life and some of them were opportunists (Leptoceratoidinae).
   In the "Livello Selli" anoxia probably did not reach the upper part of the water column
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012