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白垩纪至第三纪早期,古地中海(Tethys)自我国西部、西南部不断消退,青藏高原逐步形成,使得由晚白垩世以来残存的海相盆地逐渐转成陆相沉积;在东部,边缘海域的形成也使海相地层过渡为陆相地层;这些重大的变迁及全球性的气候变化,使我国早第三纪的古气
From the Cretaceous to the early Tertiary, the ancient Mediterranean (Tethys) gradually disappeared from the western and southwestern parts of China and gradually formed the Qinghai-Tibet Plateau, which gradually transformed the marine sediments from the Late Cretaceous to the continental sediments. In the eastern and marginal seas The formation of marine strata also make the transition to terrestrial strata; these major changes and global climate change, so that China’s ancient Tertiary age