10.6084/m9.figshare.3454847.v1 A.H. Al-Suwaidi A.H. Al-Suwaidi G.N. Angelozzi G.N. Angelozzi F. Baudin F. Baudin S.E. Damborenea S.E. Damborenea S.P. Hesselbo S.P. Hesselbo H.C. Jenkyns H.C. Jenkyns M.O. Manceñido M.O. Manceñido A.C. Riccardi A.C. Riccardi First record of the Early Toarcian Oceanic Anoxic Event from the Southern Hemisphere, Neuquén Basin, Argentina Geological Society of London 2016 Neuqu Toarcian Oceanic Anoxic Event bulk tenuicostatum excursion Southern Hemisphere Geology 2016-06-21 12:23:46 Dataset https://geolsoc.figshare.com/articles/dataset/First_record_of_the_Early_Toarcian_Oceanic_Anoxic_Event_from_the_Southern_Hemisphere_Neuqu_n_Basin_Argentina/3454847 <p>The first record of the Early Toarcian Oceanic Anoxic Event (<em>c</em>. 183 Ma) from the Southern Hemisphere is described from the Neuquén Basin, Argentina, identified chemostratigraphically on the basis of a relative increase in marine organic carbon and a characteristic negative carbon-isotope excursion (δ<sup>13</sup>C<sub>org</sub>) in bulk rock and fossil wood. The negative excursion of −6‰ in bulk organic carbon (falling to −31.3‰) crosses the boundary of the <em>tenuicostatum</em>–<em>hoelderi</em> Andean ammonite Zones, equivalent to the <em>tenuicostatum</em>–<em>falciferum</em>/<em>serpentinum</em> zones of Europe. These data indicate that the Early Toarcian Oceanic Anoxic Event was a global phenomenon. </p>