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Die geologische Zeitskala, auch stratigraphische Tabelle, zeigt die Abfolge der Perioden und Epochen in der Geschichte der Erde. © Geosphere Austria
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Trias
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< div id = "c11722" class = "frame frame-default frame-type-image frame-layout-0 frame-space-before-custom-5 frame-space-after-standard" > < div class = "ce-image ce-left ce-above" > < div class = "ce-gallery" data-ce-columns = "1" data-ce-images = "1" > < div class = "ce-row" > < div class = "ce-column" > < figure class = "image" > < a href = "../../fileadmin/_processed_/b/2/csm_welt_obertrias_0b8debb78a.jpg" title = "In der späten Trias (ca. 210 Millionen Jahre) kommt es innerhalb der Tethys zur Ablagerung zahlreicher Gesteine der Alpen. © Geosphere Austria" rel = "lightbox[lb{field:uid}]" class = "jnlightbox" data-caption = "In der späten Trias (ca. 210 Millionen Jahre) kommt es innerhalb der Tethys zur Ablagerung zahlreicher Gesteine der Alpen. © Geosphere Austria" data-lightbox = "lightbox-11722" > < img class = "image-embed-item" title = "Erde in der späten Trias" alt = "Paläoglobus" src = "../../fileadmin/_processed_/b/2/csm_welt_obertrias_18abb2d63c.jpg" width = "600" height = "458" loading = "lazy" > < / a > < figcaption class = "image-caption" >
In der spä ten Trias (ca. 210 Millionen Jahre) kommt es innerhalb der Tethys zur Ablagerung zahlreicher Gesteine der Alpen. © Geosphere Austria
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< div id = "c11721" class = "frame frame-custom-100 frame-type-image frame-layout-1 frame-space-before-standard frame-space-after-standard" > < div class = "ce-image ce-left ce-above" > < div class = "ce-gallery" data-ce-columns = "4" data-ce-images = "4" > < div class = "ce-row" > < div class = "ce-column" > < figure class = "image" > < a href = "../../fileadmin/user_upload/dokumente/Rocky_Austria/04_Entwicklungsgeschichte/05_Trias/karte_trias.jpg" title = "Südöstlich der landfesten Böhmischen Masse werden in der Tethys von der Lagune bis in die Tiefsee „alpine“ Gesteine abgelagert. © Geosphere Austria" rel = "lightbox[lb{field:uid}]" class = "jnlightbox" data-caption = "Südöstlich der landfesten Böhmischen Masse werden in der Tethys von der Lagune bis in die Tiefsee „alpine“ Gesteine abgelagert. © Geosphere Austria" data-lightbox = "lightbox-11721" > < img class = "image-embed-item" title = "Paläogeographie späte Trias" alt = "Karte" src = "../../fileadmin/_processed_/7/5/csm_karte_trias_78054b5860.jpg" width = "142" height = "106" loading = "lazy" > < / a > < figcaption class = "image-caption" >
Sü dö stlich der landfesten Bö hmischen Masse werden in der Tethys von der Lagune bis in die Tiefsee „ alpine“ Gesteine abgelagert. © Geosphere Austria
< / figcaption > < / figure > < / div > < div class = "ce-column" > < figure class = "image" > < a href = "../../fileadmin/user_upload/dokumente/Rocky_Austria/04_Entwicklungsgeschichte/05_Trias/korallen__adneter_tropf.jpg" title = "Korallen mit buntem Kalkschlamm prägen die dekorativen Gesteine („Adneter Tropf“) der späten Trias bei Adnet (S) (Bildbreite: 1 m). © Geosphere Austria" rel = "lightbox[lb{field:uid}]" class = "jnlightbox" data-caption = "Korallen mit buntem Kalkschlamm prägen die dekorativen Gesteine („Adneter Tropf“) der späten Trias bei Adnet (S) (Bildbreite: 1 m). © Geosphere Austria" data-lightbox = "lightbox-11721" > < img class = "image-embed-item" title = "Korallen" alt = "Fossilien" src = "../../fileadmin/_processed_/c/4/csm_korallen__adneter_tropf_1a5d5ed2d3.jpg" width = "142" height = "106" loading = "lazy" > < / a > < figcaption class = "image-caption" >
Korallen mit buntem Kalkschlamm prä gen die dekorativen Gesteine („ Adneter Tropf“ ) der spä ten Trias bei Adnet (S) (Bildbreite: 1 m). © Geosphere Austria
< / figcaption > < / figure > < / div > < div class = "ce-column" > < figure class = "image" > < a href = "../../fileadmin/user_upload/dokumente/Rocky_Austria/04_Entwicklungsgeschichte/05_Trias/megalodont.jpg" title = "Dreidimensionale „Dachstein“-Muschel Megalodon (Höhe: 12 cm) und deren kuhtrittförmige Querschnitte sind typisch für die lagunären Kalke der späten Trias. © Geosphere Austria" rel = "lightbox[lb{field:uid}]" class = "jnlightbox" data-caption = "Dreidimensionale „Dachstein“-Muschel Megalodon (Höhe: 12 cm) und deren kuhtrittförmige Querschnitte sind typisch für die lagunären Kalke der späten Trias. © Geosphere Austria" data-lightbox = "lightbox-11721" > < img class = "image-embed-item" title = "Muschel" alt = "Fossil" src = "../../fileadmin/_processed_/9/9/csm_megalodont_61f095ef5a.jpg" width = "142" height = "106" loading = "lazy" > < / a > < figcaption class = "image-caption" >
Dreidimensionale „ Dachstein“ -Muschel Megalodon (Hö he: 12 cm) und deren kuhtrittfö rmige Querschnitte sind typisch fü r die lagunä ren Kalke der spä ten Trias. © Geosphere Austria
< / figcaption > < / figure > < / div > < div class = "ce-column" > < figure class = "image" > < a href = "../../fileadmin/user_upload/dokumente/Rocky_Austria/04_Entwicklungsgeschichte/05_Trias/lunzer_flora.jpg" title = "Fiederblatt (Pterophyllum) aus den Lunzer Schichten eines historischen Kohlebergbaus in Lunz am See (NÖ) (Bildbreite: 12 cm). © Geosphere Austria" rel = "lightbox[lb{field:uid}]" class = "jnlightbox" data-caption = "Fiederblatt (Pterophyllum) aus den Lunzer Schichten eines historischen Kohlebergbaus in Lunz am See (NÖ) (Bildbreite: 12 cm). © Geosphere Austria" data-lightbox = "lightbox-11721" > < img class = "image-embed-item" title = "Fossiles Farnblatt" alt = "Fossil" src = "../../fileadmin/_processed_/f/8/csm_lunzer_flora_a332ed7742.jpg" width = "142" height = "106" loading = "lazy" > < / a > < figcaption class = "image-caption" >
Fiederblatt (Pterophyllum) aus den Lunzer Schichten eines historischen Kohlebergbaus in Lunz am See (NÖ ) (Bildbreite: 12 cm). © Geosphere Austria
2025-02-12 13:28:47 +01:00
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< div id = "c11719" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-custom-10" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < h3 > Paradiesischer Tethys-Schelf< / h3 > < p > In der Trias setzte sich die Dehnung der Lithosphä re am Westende der Tethys mit verminderter Intensitä t fort und die Erdoberflä che sank durch die Abkü hlung nach der permischen Aufheizung langsam ab. Die Schuttanlieferung aus dem wü stenhaften Hinterland ließ immer mehr nach. In der Folge kam es ü ber sandigen und tonigen Ablagerungen zur Bildung dunkler Flachwasserkalke in schlecht durchlü fteten flachen Meeresbereichen.< / p > < / div > < / div > < / div >
< div id = "c16696" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-standard" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < p > Am Beginn der mittleren Trias, vor etwa 240 Millionen Jahren, dehnte sich der ozeanische Bereich der Tethys immer weiter gegen Westen bis in den heutigen Alpenraum aus. Dabei wurden die direkt angrenzenden kontinentalen Bereiche wie das Ostalpin und Sü dalpin endgü ltig von einem Schelfmeer ü berflutet. Dieses Meer dehnte sich allmä hlich mit zahlreichen Buchten weit in den Raum des heutigen West- und Nordeuropa aus. Bedingt durch Meeresspiegelschwankungen verlagerte sich die Kü stenlinie mehrmals. Das Krustenstü ck, welches heute die Bö hmische Masse aufbaut, war wä hrend der gesamten Trias eine Insel innerhalb dieses Schelfmeeres.< / p > < / div > < / div > < / div >
< div id = "c11725" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-custom-10" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < h3 > Riffe und Lagunen des Korallenmeeres< / h3 > < p > Am Rand des Schelfmeeres zum Beckenbereich des Tethys-Ozeans entwickelte sich durch den zunehmend verbesserten Wasseraustausch ein Riffgü rtel. Dahinter lagen weite Lagunen. Auf diesen Karbonatplattformen lebten Kalk abscheidende Organismen wie Algen, Schwä mme und Korallen, die sich deutlich von jenen unterschieden, die vor dem Aussterbeereignis im Perm die Meere bevö lkerten.< / p > < / div > < / div > < / div >
< div id = "c16697" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-custom-10" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < p > Um 230 Millionen Jahre vor heute entstanden im Bereich der heutigen Sü dtiroler Dolomiten Vulkane, deren Aschen bis in den Bereich der heutigen Kalkalpen verweht wurden. Zusä tzlich nahm am Beginn der spä ten Trias die Schuttanlieferung vom nordwestlich gelegenen Festland kurzzeitig zu. Vor allem in Gebieten, die nä her am Festland lagen (heutiges Subpenninikum und Helvetikum), kam es zur Ablagerung von Sandsteinen, Tonsteinen und Gips. Letzte Auslä ufer dieser Sedimente reichten bis in den Bereich der heutigen Kalkalpen, wo das Wachstum der Riffe kurzfristig unterbrochen wurde. Lokal, etwa in Lunz am See, bildeten sich Sand- und Tonsteine mit Kohlelagen, danach entwickelten sich erneut groß e Karbonatplattformen.< / p > < / div > < / div > < / div >
< div id = "c16698" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-custom-10" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < p > Das Zusammentreffen nä hrstoffreicher Tiefenwä sser mit warmen Oberflä chenwä ssern des lichtdurchfluteten tropischen Schelfmeeres fü hrte bei gleichzeitiger Absenkung des Untergrundes zu einer enormen Kalkproduktion. Im heutigen Ostalpin und Sü dalpin wurden bereichsweise ü ber 3000 m mä chtige kalkige Sedimente gebildet, die heute die Landschaft der Nö rdlichen Kalkalpen maß geblich prä gen.< / p > < / div > < / div > < / div >
< div id = "c16699" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-standard" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < p > Die damaligen Bedingungen waren ä hnlich jenen, die heute in der Karibik oder am Groß en Barriere-Riff vor der Ostkü ste Australiens herrschen. Am Ende der Trias kam es zu einem weltweiten Absterben der Riffe.< / p > < / div > < / div > < / div >
< div id = "c11729" class = "frame frame-default frame-type-textpic frame-layout-0 frame-space-before-standard frame-space-after-standard" > < div class = "ce-textpic ce-left ce-above" > < div class = "ce-bodytext" > < h3 > Abhang in den weiten Ozean< / h3 > < p > Jenseits der Riffe, in Wassertiefen von wenigen 100 Metern, wurde der feine Kalkschlamm der fü r ihre Ammoniten berü hmten Hallstä tter Kalke abgelagert. Daran schloss sich der Kontinentalhang und schließ lich der Boden des etwa 4000 m tiefen Tethys-Ozeans an. Hier entstanden mit zunehmender Wassertiefe kieselige Ablagerungen, die heute charakteristisch fü r das Meliatikum sind.< / p > < / div > < / div > < / div >
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