Study of fossil wood from the Middle–Late Miocene sediments of Dhemaji and Lakhimpur districts of Assam, India and its palaeoecological and palaeophyto-geographical implications

Journal of Earth system science

R C Mehrotra1¹  S K Basumatary1¹  S K Bera1¹  G Srivastava1¹ 

[1] Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, India.$$

关键词: Tipam Group;    Anacardiaceae;    Euphorbiaceae;    Fabaceae;    palaeoclimate;    fossil wood;    Miocene;    Assam.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

In order to reconstruct the palaeoclimate, a number of fossil wood pieces were collected and investigated from two new fossil localities situated in the Dhemaji and Lakhimpur districts of Assam. They belong to the Tipam Group considered to be of Middle–Late Miocene in age and show affinities with Gluta (Anacardiaceae), Bischofia (Euphorbiaceae), Bauhinia, Cynometra, Copaifera-Detarium-Sindora, Millettia-Pongamia, and Afzelia-Intsia (Fabaceae). The flora also records a new species of Bauhinia named Bauhinia miocenica sp. nov. The assemblage indicates a warm and humid climate in the region during the deposition of the sediments. The occurrence of some southeast Asian elements in the fossil flora indicates that an exchange of floral elements took place between India and southeast Asia during the Miocene.

【 授权许可】

Unknown