Jean Guex

TL;DR: In this paper, high-precision U/Pb geochronology from volcanic ashes was used to show that the Triassic-Juras-sic boundary and end-Triassic biological crisis from two independent marine stratigraphic sections correlate with the onset of terrestrial fl ood volcanism in the Central Atlantic Magmatic Province to <150 ka.

TL;DR: Analysis of a global diversity data set of ammonoid genera covering about 106 million years centered on the Permian-Triassic boundary shows that Triassic ammonoids actually reached levels of diversity higher than in the PerMian less than 2 million years after the PTB.

TL;DR: In this article, new zircon U-Pb ages are proposed for late Early and Middle Triassic volcanic ash layers from the Luolou and Baifeng formations (northwestern Guangxi, South China).

TL;DR: In this article, high-resolution ammonite correlations and carbon isotope marine record in the New York Canyon area allow to distinguish two negative carbon excursions across this boundary with different paleoenvironmental meanings.

TL;DR: Geochim et al. as discussed by the authors used ID-TIMS dating of single chemical-abraded zircons from volcanic ash layers within the Pucara Group, Aramachay Formation in the Utcubamba valley, northern Peru.