Cataclysms: A life spent chasing planetary catastrophe

日期:2019-04-04 10:19:03 作者:邱抟闩 阅读:

Patrick Kelley Worldwide Photography/NGS Creative By Stephen Drury IN 1980, Luis and Walter Alvarez and co-workers found irrefutable signs that a mighty asteroid impact occurred 66 million years ago. It coincided with the demise of the dinosaurs, among many other taxa, and with vast but short-lived magma outpourings called flood basalts in western India. Its crater survives off Mexico’s Yucatan peninsula. Many Earth scientists greeted the causality the team ascribed to such coincidences with alarm: