Upper Cretaceous strata of the Mahajanga Basin, northwestern Madagascar, yield some of the most significant and exquisitely preserved vertebrate fossils known from Gondwana. The sedimentology of these strata and their stratigraphic relations have been the focus of renewed geological investigations during the course of five expeditions since 1993. We here designate stratotypes and formalize the ...

Abstract The timing and mechanisms of the climatic environmental perturbations induced by emplacement Deccan Traps large igneous province (India) their contribution to Cretaceous-Paleogene (K-Pg) mass extinction are still debated. In many marine sediment archives, mercury (Hg) enrichments straddling K-Pg boundary have been interpreted as signature volcanism, but Hg may also derived from Chicxul...

Abstract Oceanic red beds (ORBs) are present in Upper Cretaceous and Danian deep-marine deposits the Basque–Cantabrian Basin of northern Spain. The presence regularity succession marl–limestone couplets is exceptional based on macroscopic, microscopic geochemical evidence collected. Five types identified colour, a high maximum sedimentation rate (3.6 cm ka –1 ) noted. oxidizing activity deep, c...

This report summarizes the international divisions and ages in the Geologic Time Scale, published in 2012 (GTS2012). Since 2004, when GTS2004 was detailed, major developments have taken place that directly bear and have considerable impact on the intricate science of geologic time scaling. Precam brian now has a detailed proposal for chronostratigraphic subdivision instead of an outdated and ab...

We report on new collections of cephalopods (ammonites and nautilids) from the Cretaceous-Paleogene (K-Pg) successions Corsicana Kincaid formations exposed along Brazos River in Falls County, Texas. An abundant fauna eight species comprising four genera ammonites is described Formation, including Discoscaphites mullinaxorum n. sp. The presence aptychi (probably lower jaws) Eubaculites, as well ...

Abstract Untangling the timing of environmental effects Deccan volcanism with respect to Chicxulub impact is instrumental fully assessing contributions both climate change over Cretaceous-Paleogene boundary (KPB) interval. Despite recent improvements in radiometric age calibrations, accuracy constraints and correlations insufficient resolve exact mechanisms leading 1 m.y. across KPB. We present...