Abstract:

This paper deals with the systematic analyses and determinations of spore and pollen fossils from the Early Cretaceous Bayanhua Formation of Ejinuor Basin in eastern Inner Mongolia.A total of 48 genera were studied,among which 1 genus and 8 species are newly discovered.The Bayanhua Formation contains two sporo-pollen assemblages:1)in the Upper Member,the“Cicatricosis porites-Concavissimis porites-Pinaceae”assemblage;and 2)in the Middle Member,the“Lygodiaceae-Pinaceae”as-semblage.No sporo-pollen is discovered in the Lower Member of this For-mation.Should the Rehe Group be designated as the Late Jurassic or the Early Cretaceous? This question has been strongly controversial in recent years.Weconsider that,after study and comparison,the Bayanhua Formation in theupper part of this group should be designated as the Early Cretaceous.