Record details

Title
    Fauna, Stratigraphy and Depositional Environment of the Hettangian-Sinemurian (Early Jurassic) of Adnet (Salzburg, Austria)
Statement of responsibility
    Florian Böhm, Oskar Ebli, Leopold Krystyn, Harald Lobitzer, Miloš Rakús, Miloš Siblík
Other titles
    Fauna, Biostratigraphie und Sedimentologie des Hettang und Sinemur (Unterlias) von Adnet, Salzburg, Österreich
    Geologie ohne Grenzen - Festschrift 150 Jahre Geologische Bundesanstalt (Variant.)
Author
    Böhm, Florian
    Ebli, Oskar
    Krystyn, Leopold
    Lobitzer, Harald
    Rakús, Miloš
    Siblík, Miloš
Language
    anglicky
Source title - serial
    Abhandlungen der Geologischen Bundesanstalt
Vol./nr.
    Vol. 56, no. 2
Pages
    p. 143-271
Year
    1999
Notes
    53 obr., 4 tab., 30 pl.
    il.
    Německé resumé
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Abh. Geol. Bundesanst. (Wien)
Subject group
    Algophytae
    Ammonoidea
    Brachiopoda
    dajka klastická
    Foraminifera
    izotopy C
    izotopy O
    izotopy stabilní
    jura-spodní
    nannofosílie
    popis taxonů
    rét
    složení železomanganové
    stratotyp
    trace fossils
    trias
    vápenec
    zóny biostratigrafické
Geographical name
    Rakousko-Salzburg
Keyword
    Adnet
    Austria
    Depositional
    Early
    Environment
    Fauna
    Hettangian-Sinemurian
    Jurassic
    Salzburg
    Stratigraphy
Abstract (in english)
   In this paper we give detailed descriptions of the Early Liassic variegated limestones outcropping in the quarries of Adnet. These limestones formed during and shortly after the drowning of the Late triassic reefs, which had flourished along the Tehyan continental margins for most of the Triassic but vanished completely at the beginning of the Jurassic. We describe a peculiar facies from the Adnet quarries that formed at the transition from the former reef to the basin shortly after the end-Triassic reef drowning. This facies consists of variegated massive to bedded limestones with rich faunas of siliceous sponges, crinoids, foraminifera, brachiopods and ammonites. The term "Schöll-Formation" is introduced for this lithologic unit with the type section at the Langmoos Quarry, Adnet. The Schnöll-Formation comprises the period from the upper Planorbis Zone until the Marmorea Zone, i.e. it is of Hettanigan age. It can be subdivided in two members, the lower Langmoos-Mb.
   with abundant sponges and sponge spicules and the upper Guggen-Mb., dominated by crinoidal debris. The Sinemurian of the Adnet area is made up by the lower Adnet-Formation, red, thin-bedded, often nodular limestones. It starts with the condensed Basal Unit, red limestones intercalated between two ferromanganese crusts, the lower "Marmorea Crust" of Hettangian (-Sinemurian?) age and the upper "Basal Sinemurian Crust" that formed during the higer Sinemurian. The latter crust is often connected with deepwater stromatolites. Three lithostratigraphic members of the Sinemurian Adnet-Formation are recognized in the Adnet quarries: The thin-bedded, nodular-marly Schmiedwirt-Mb., the decimetre-bedded, marl-poor Lienbacher-Mb., and the crinoidal limestones of the Motzen-Mb. The depositional relief during the Sinemurian is reconstructed from the attitude of geopetal fabrics. We find a northeast dipping palaeoslope with an angle of 10 to 15 degrees in the area close the Rhaetian reef.
   The vertical relief was probably on the order of 50-80 m
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012