TY - DATA T1 - High-resolution dynamics of Early Jurassic marine extinctions: the case of Pliensbachian–Toarcian ammonites (Cephalopoda) PY - 2016/06/21 AU - Guillaume Dera AU - Pascal Neige AU - Jean-Louis Dommergues AU - Emmanuel Fara AU - Rémi Laffont AU - Pierre Pellenard UR - https://geolsoc.figshare.com/articles/dataset/High-resolution_dynamics_of_Early_Jurassic_marine_extinctions_the_case_of_Pliensbachian_Toarcian_ammonites_Cephalopoda_/3454760 DO - 10.6084/m9.figshare.3454760.v1 L4 - https://ndownloader.figshare.com/files/5426876 L4 - https://ndownloader.figshare.com/files/5426879 L4 - https://ndownloader.figshare.com/files/5426882 KW - dynamic KW - NW Tethyan KW - disturbance KW - coeval marine transgression KW - ammonite species KW - Arctic domains KW - origination rates KW - climate change KW - 1 Ma KW - Jurassic marine extinctions KW - Dispansum events KW - extinction pulses KW - Toarcian crisis KW - Pliensbachian KW - mass extinction KW - 772 ammonite species KW - Dispansum Chronozone KW - Toarcian diversity collapse KW - Gibbosus event KW - carbon cycle KW - Geology N2 - The Pliensbachian–Toarcian interval was marked by major environmental disturbances and by a second-order mass extinction. Here, we reappraise the taxonomic, spatiotemporal and selective dynamics of extinctions over the whole interval, by analysing a high-resolution dataset of 772 ammonite species from NW Tethyan and Arctic domains. On average, 40–65% of ammonite species disappeared during each subchronozone, but higher extinction pulses (reaching 70–90%) prevailed from the Margaritatus to the Dispansum Chronozone. The main extinctions, corresponding to the Gibbosus, Pliensbachian–Toarcian boundary, Semicelatum, Bifrons–Variabilis, and Dispansum events, differed in their dynamics, suggesting episodes of ecological stress related to climate change, regression, disturbance in the carbon cycle or anoxia. The multi-pulsed volcanic activity in the Karoo–Ferrar province could well have triggered these ecological changes. In addition, ammonites experienced a morphological bottleneck during the Gibbosus event, 1 Ma before the Early Toarcian diversity collapse. Typically, drops in richness were related both to high extinctions and to declines in origination rates. This feature could result from strengthened ecological stresses related to the temporal overlap of environmental disturbances. After the Early Toarcian crisis, the recovery of ammonites was rapid (2 Ma) and probably influenced by a coeval marine transgression. ER -