Podozamites(Conifers)from the Lower Cretaceous of Beishan, Gansu Province and its palaeoclimatic implications
LI Aijing1, DU Baoxia1, ZHANG Mingzhen2, LIN Shaohua1, PENG Jing1, ZHANG Jing1, LIU Guolong2, JIAO-BA Dunzhu2, MA Guorong1, HUI Jianguo1
1 Key Laboratory of Mineral Resources in Western China(Gansu Province),Lanzhou University,Lanzhou 730000,Chin; 2 Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
Abstract：The extinct genus Podozamites belongs to conifers,and is an important component of the Mesozoic flora of the Northern Hemisphere. In this study,three species of Podozamites were reported from the Lower Cretaceous of the Beishan area,Gansu Province,China,including Podozamites sp.,Podozamites aff. distans and Podozamites bullus. On the basis of the global records and palaeogeographic distribution of the Podozamites species,as well as palaeoclimatic zones of the Mesozoic,the palaeoclimatic significance of this genus is addressed. The results show that Podozamites were more abundant and mainly distributed in warm and humid climate zones of the northern Hemisphere during Late Triassic to Middle Jurassic. The abundance of Podozamites declined,along with the expansion of arid climatic zones,and the distribution also migrated along with warm-humid climatic zones during the Late Jurassic to Early Cretaceous. The palaeogeographic distribution of Podozamites species was mainly influenced by shifts of warm-humid climatic zones during the Mesozoic. Podozamites might have been more adaptive to warm and moist conditions and thus can serve as an indicator genus of warm-humid climates.
LI Aijing,DU Baoxia,ZHANG Mingzhen et al. Podozamites(Conifers)from the Lower Cretaceous of Beishan, Gansu Province and its palaeoclimatic implications[J]. JOPC, 2023, 25(2): 485-496.
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