The stratum characteristic and era of Ying cheng formation of the Cretaceous in Songliao Basin

摘要

In the Songliao Basin of China is well-developed Cretaceous stratigraphy. Although the system of lithology stratigraphy has been established, the dispute is mainly caused by chronostratigraphy system. The Rehe Biota growth period in Early Cretaceous with the distinct regional character. Plant fossils such as Ruffordia goeppertii, Acanthopteris gothanii, Coniopteris burejensis, Arctoperis rarinervis et al. and, a spot of angiospermae fossils such as Clavatipollenites, Polyporites, Tricolpopollenites et al have been obtained from Yingcheng Formation, they are Early Cretaceous. LA-ICPMS and Shrimp zircon ages of volcanic rock samples from Yingcheng range from 101.4±1.9Ma-113.8±1.5Ma, falling into the Late Aptian to Middle Albian stage.