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A revised Cenozoic geochronology and chronostratigraphy
Since the publication of our previous time scale (Berggren and others, 1985c = BKFV85) a large amount of new magneto- and biostratigraphic data and radioisotopic ages have become available. AnExpand
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
Earliest Pleistocene hominid cranial remains from Dmanisi, Republic of Georgia: taxonomy, geological setting, and age.
Paleontological, archaeological, geochronological, and paleomagnetic data from Dmanisi all indicate an earliest Pleistocene age of about 1.7 million years ago, supporting correlation of the new specimens with the Koobi Fora fossils. Expand
Age of the earliest known hominids in Java, Indonesia.
The hominid fossils, a juvenile calvaria of Pithecanthropus and a partial face and cranial fragments of Meganthropus, commonly considered part of the Asian Homo erectus hypodigm, are at least 0.6 million years older than fossils referred to as Homo erectu from Olduvai Gorge, Tanzania, and comparable in age with the oldest Koobi Fora Homo cf. Expand
The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins
Dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 � 0.3 million years ago, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. Expand
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
Paleocene-Eocene Thermal Maximum and the Opening of the Northeast Atlantic
The Paleocene-Eocene thermal maximum (PETM) has been attributed to a sudden release of carbon dioxide and/or methane. 40Ar/39Ar age determinations show that the Danish Ash-17 deposit, which overliesExpand
Cretaceous age for the feathered dinosaurs of Liaoning, China
The results of this dating study indicate that the lower Yixian fossil horizons are not Jurassic but rather are at least 20 Myr younger, placing them within middle Early Cretaceous time. Expand