Abstract: 19 phyla of fossils from Cretaceous already discovered in the Songliao basin have been analysed in respect to their depositional environment,distribution and relative amount and ecology.Terrestrial and fresh-water organisms are found to predominate the biota,with thriving individuals,monotanous genera and species,low differentiation,abundance of new species,strong local features,simple ornamentation,absence of typical marine life etc.Comprehensive studies are also made of the trace elements in the fossils and: their wall rocks,isotopes,salts,minerals,organic geochemicals and other facies indices,together with the regional geologic setting and the scope of transgression in the northeastern part of Asia at the time.From pale ontology,geology and geochemistry,there is ample proof that the Cretaceous rocks in the Songliao basin are of continental origin and that at the time of deposition of Cretaceous,the basin was an inland lake,with fresh water for most of the time,and brackish or saline water sometimes.

摘要： 松辽盆地是一个大型的中、新生代的断拗盆地,面积达26万平方公里.盆地的主要发育时期是白垩纪,自登娄库组至明水组厚达6000多米,发现了极其丰富的陆相生物化石,如介形类、叶肢介、瓣鳃类等共19个化石门类.