Open AccessThe Great Dinosaur Extinction Controversy
Author(s) -
Glen William
Publication year - 1997
Publication title -
eos, transactions american geophysical union
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.316
H-Index - 86
eISSN - 2324-9250
pISSN - 0096-3941
DOI - 10.1029/97eo00233
Subject(s) - meteorite , astrobiology , extinction event , group (periodic table) , paleontology , extraterrestrial life , cretaceous , geology , extinction (optical mineralogy) , platinum group , earth science , demography , chemistry , platinum , physics , sociology , biological dispersal , population , organic chemistry , biochemistry , catalysis
In 1980 a scientific upheaval was triggered by the advent of the Alvarez‐Berkeley group hypothesis. It explained the death of the dinosaurs and most of the life on Earth 65 million years ago by effects of the impact of a meteorite 10 km wide. Although numerous previous impact hypotheses had been largely ignored, that of the Alvarez group arrested the attention of scientists because it was based on an unprecedented form of evidence: highly anomalous concentrations of platinum group elements in seemingly meteoritic ratios within the pinkie‐thick Cretaceous/Tertiary boundary clay.