The Cretaceous biotas of Songliao Basin are divided in ascending order into the Jehol Biota in the faulted period, the Songhuajiang Biota in the depressed period and the Mingshui Biota in the atrophied period. The three major biotas are well developed and widely distributed. This paper summarizes systematically the main characters of each biota and reveals the general biota features, the general vertical distribution patterns and their significance on the research of biostratigraphy, ecological environment and paleoclimate.
