POTASSIUM–ARGON age determinations have been carried out mainly on minerals with a high potassium content, particularly micas and potassium feldspars, found in intermediate to acid igneous rocks, but ...

Preface, by O.A. Schaeffer and J. Zähringer.--History of the K-Ar method of geochronology, by F.G. Houtermans.--Determination of radiogenic argon, by T. Kirsten.--Potassium analysis, by O.

KNOWLEDGE of the history and evolution of the mammalian fauna of Australia was meagre until the recent work of Stirton et al. 1. They located a sequence of faunas in Central Australia, but precise ...

Berkeley -- Scientists at the University of California, Berkeley, and the Berkeley Geochronology Center have pinpointed the date of the dinosaurs' extinction more precisely than ever thanks to ...