Moving forward for a revised Late Jurassic-Early Cretaceous Geological Time Scale

AGUIRRE-URRETA, B.; MARTÍNEZ, M.; LESCANO, M.; NAIPAUER, M.; CONCHEYRO, A.; LÓPEZ-MARTÍNEZ, R.; VENNARI, V.; RAMOS, V.

Vienna

Congreso; EGU General Assembly 2019; 2019

The geologic time scale shows large uncertainties regarding the absolute age and durations of several stages in theLate Jurassic to Early Cretaceous. Recent studies are analysing these issues and the results differ from the GeologicTime Scale 2016 by several millions of years. New high precision techniques for absolute dating together with classic biostratigraphic, magnetostratigraphic and cyclostratigraphic approaches are being applied around to world totackle this problem. These studies range from Re-Os geochronology in the Boreal Realm to CA-ID TIMS U-Pbgeochronology in the southern Andes for the Upper Jurassic; astrochronology, geochronology and biostratigraphyfor the Valanginian-Hauterivian in the Mediterranean Tethys and the Andes; and magnetostratigraphy, biostratigraphy and geochronology for resolving the controversy on the absolute age of the Barremian-Aptian boundary.Although it is necessary to perform more chronostratigraphic, magnetostratigraphic and radiometric analyses fromregions of the world expanding the classic Tethyan Realm, we present here a summary of these topics showing thatthe Late Jurassic-Early Cretaceous geologic time scale is ready for revision