PALYNOFLORA FROM THE QUANTOU FORMATION OF SONGLIAO BASIN, NE CHINA AND ITS BEARING ON THE UPPER-LOWER CRETACEOUS BOUNDARY
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Abstract:
In the Songliao Basin of northeastern China is well developed a non marine Cretaceous sequence composed of 10 lithological formations (see Li Wen ben and Liu Zhao sheng, 1994, fig.16). Although all the formations are rich in fossils including bivalves, gastropods, conchostracans, ostracods, fishes, reptiles, charophytes, sporomorphs and plant megafossils, researchers on different fossil groups have not yet reached a consensus to chronological problems for each formation. Unfortunately, the divergence of view points even exists among the palynologists. For the Upper Lower Cretaceous boundary, palynologists have given two different proposals: between the Quantou and Denglouku formations (Li Wen ben and Liu Zhao sheng 1994) and between the Qinshankou and Quantou formations (Gao Rui qi, 1982; Gao Rui qi et al ., 1999). Obviously, the dispute is mainly caused by the different datings of the Quantou Formation.
