THE EVOLUTIONARY SUCCESSION OF CRETACEOUS ANGIOSPERM POLLEN IN CHINA

In the past decade, the earliest angiospermous inflorescence known in the world and pollen extracted from it were discovered in Jixi, Helongjian, China. Some of the Chinese palynologistis have made thorough inquiries on the evolutionary trends of Cretaceous angiosperm pollen in some areas and a number of geological time intervals, as shown in the following six papers: Evolutionary trends of Cretaceous angiosperm pollen from the Songliao Basin, NE China (Albian Maastrichtian, Gao Rui qi, 1981); A review on the study of Early Cretaceous angiosperm pollen in China (Barremian-Cenomanian, Song Zi chen, 1986); Evolution of angiosperm pollen of the early Late Cretaceous in the western Tarim Basin, South Xinjiang (Cenomanian-Santonian, Zhang et Zhan, 1986); Evolutionary succession of angiosperm pollen of Mid Cretaceous in Jiangxi area (Mid Late Albian-Turonian, Yu, Han and Wu, 1985); The study of Early Cretaceous angoispem pollen in Northern China (Yu, 1990), and Early Cretaceous angiospermous pollen from Eren Basin, Inner Mongolia (Hua, 1991). These previous studies on evolution of angiosperm pollen of Cretaceous from various areas have offered a foundation to establish systematic evolutionary succession of Cretaceous in China. Therefore a composite evolutionary sequence of angiospermous pollen has been constructed. After reviewing the previous data, at present ten evolutionary stages of angiospermous pollen of Cretaceous are suggested in China. Those associated marine fossils from western Tarim Basin are specially empolyed for dating evolutionary stages for Mid Cretaceous and controlling age-limit for other stages.

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Clc Number:

Q914.88 Q913.84