Scientists subsequently found enhanced iridium levels at more than 100 end Cretaceous sites worldwide and shocked quartz at more than 30 sites.
Scientists subsequently found enhanced iridium levels at more than 100 end Cretaceous sites worldwide and shocked quartz at more than 30 sites.
世界各地的白垩纪末期遗址中，科学家发现了超过100处有铱含量高得异常的层位，采集到变形石英标本的遗址也超过30处。