Fourteen species of nonmarine gastropod opercula are found to be in high abundance in the Oligocene upper member of the ......

季风干旱的环境系统开始在渐新世期间开发了的亚洲人，而是干旱地区边界的准确位置在渐新世是不明确的。石块哺乳动物集合能被用来估......