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Intercalibration of standards, absolute ages and uncertainties in 40Ar/39Ar dating
The 40Ar/39Ar dating method depends on accurate intercalibration between samples, neutron fluence monitors, and primary 40Ar/40K (or other external) standards. The 40Ar/39Ar age equation may beExpand
Synchronizing Rock Clocks of Earth History
This calibration of tephras in marine deposits in Morocco to calibrate the age of Fish Canyon sanidine provides tight constraints for the astronomical tuning of pre-Neogene successions, resulting in a mutually consistent age of ∼65.95 Ma for the Cretaceous/Tertiary boundary. Expand
Evolution of the northern Main Ethiopian rift: birth of a triple junction
Models for the formation of the archetypal rift-rift-rift triple junction in the Afar depression have assumed the synchronous development of the Red Sea-Aden-East African rift systems soon afterExpand
Chronology of volcanism and rift basin propagation - Rungwe volcanic province, East Africa
Continental rifts are segmented along their lengths into 50 to 100 km-long extensional basins, suggesting a genetic relationship with regularly segmented oceanic rifts. To investigate the spatial andExpand
Late Cenozoic Moisture History of East Africa
Lake sediments in 10 Ethiopian, Kenyan, and Tanzanian rift basins suggest that there were three humid periods at 2.7 to 2.5 million years ago, superimposed on the longer-term aridification of East Africa. Expand
The age of the Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei caldera – Italy) assessed by 40Ar/39Ar dating method
Abstract The Neapolitan Yellow Tuff (NYT) is the product of the largest known trachytic phreatoplinian eruption. It covered an area larger than 1000 km2 with an estimated volume of about 40 km3 ofExpand
Intercalibration of astronomical and radioisotopic time
The 40Ar/39Ar radioisotopic dating technique is one of the most precise and versatile methods available for dating events in Earth's history, but the accuracy of this method is limited by theExpand
Time Scales of Critical Events Around the Cretaceous-Paleogene Boundary
Radiometric dating establishes the mass extinction that killed the dinosaurs as synchronous with a large asteroid impact between the Cretaceous-Paleogene boundary and associated mass extinctions with the Chicxulub bolide impact to within 32,000 years. Expand
Mid-Pleistocene Acheulean-like stone technology of the Bose basin, South China.
Stone artifacts from the Bose basin, South China, imply that Acheulean-like tools in the mid-Pleistocene of South China imply that Mode 2 technical advances were manifested in East Asia contemporaneously with handaxe technology in Africa and western Eurasia. Expand