白垩纪至早第三纪地层在我国东部地区分布很广,过去认为陆相红层岩性、岩相变化很大,古生物化石缺乏,很难划分和对比。解放后,在红层盆地中找到了许多盐、铜、石油等重要矿产,促进了对红层的科学研究工作。六十年代初期以来陆续在一些盆地中发现了古脊椎动物化石,同时在若干盆地进行了微体古生物的研究工作,建立了一些盆地的地 Cretaceous to early Tertiary strata are widely distributed in the eastern part of China. In the past, the lithofacies and lithofacies of the terrigenous red beds changed greatly, and paleontological fossils were lacking. It is difficult to distinguish and contrast them. After the liberation, many important minerals such as salt, copper and oil were found in the red beds and promoted the scientific research on the red beds. Since the early 1960s, ancient vertebrate fossils have been found in some of the basins. In the meantime, some studies have been conducted on microfacies paleontology in some basins, and some of the basins