Occurrence of Persea Mill. from the Siwalik Forest of Darjeeling, Eastern Himalaya: Paleoclimatic and Paleogeographic Implications

查看全文 作　　者：Mahasin Ali [1,2]Khan;Subir [1]Bera

机构地区：[1]Centre of Advanced Study,Department of Botany,University of Calcutta,Kolkata-700019,India;[2]Department of Botany,Sidho-Kanho-Birsha University,Purulia 723104,India

出　　处：《Journal of Earth Science》索引2016年第27卷第5期,共8页

基　　金：financial assistance from the Department of Science and Technology, New Delhi 摘　　要：Fossil leaf remains of two new species of Persea Mill., belonging to the family Lauraceae collected from the lower part of the Siwalik sediments(Gish Clay Formation of Sevok Group, Middle Miocene) of Darjeeling foothills of eastern Himalaya, are described. The new species are Persea miogamblei sp. nov. and Persea neovillosa sp. nov.. On the basis of leaf architecture(size, shape and venation pattern) fossil leaves described in this article closely resemble modern leaves of Persea gamblei(King ex Hook. f.) Kosterm. and Persea villosa(Roxb.) Kosterm.. The geographic distribution of the fossils and their modern counterparts are discussed and on that basis tropical evergreen vegetation with a warm and humid climate at the time of deposition of the Siwalik sediments is suggested in contrast to the present day tropical deciduous vegetation in this area. The present finding also suggests probable migration of these lauraceous taxa to Southeast Asia. 关键词：喜马拉雅古气候鳄梨梨属古地理森林基础架构沉积物

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Occurrence of Persea Mill. from the Siwalik Forest of Darjeeling, Eastern Himalaya: Paleoclimatic and Paleogeographic Implications

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