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

作　　者：Mahasin Ali Khan Subir Bera Mahasin Ali Khan Subir Bera(Centre of Advanced Study, Department of Botany, University of Calcutta, Kolkata-700019, India Department of Botany Sidho-Kanho-Birsha University, Purulia 723104, India)

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》2016年第5期883-890,共8页地球科学学刊（英文版）

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.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：PERSEA fossil leaves Middle Miocene Siwalik paleoelimate Darjeeling. 

分 类 号：Q914[天文地球—古生物学与地层学] P532[生物学—古生物学]