Eocene out-of-India dispersal of Asian dipterocarps
DSpace at IIT Bombay
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Title |
Eocene out-of-India dispersal of Asian dipterocarps
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Creator |
DUTTA, S
TRIPATHI, SM MALLICK, M MATHEWS, RP GREENWOOD, PF RAO, MR SUMMONS, RE |
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Subject |
VASTAN LIGNITE MINE
WESTERN INDIA FOSSIL RESINS COLLISION AGE HYDROCARBONS PHYLOGENY EVOLUTION SEQUENCES Early Eocene Dipterocarpaceae Biogeography Resin chemistry Palynology |
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Description |
The Dipterocarpaceae, a well known and economically important family of trees of the tropical rain forests of Asia, comprise over 470 species. These angiosperm trees contribute to 30% of the total area in typical lowland evergreen forests in Southeast Asia. Despite their remarkable diversity and regional ecological dominance, the origins and phytogeographical evolution of the family are poorly understood. The earliest dipterocarp fossils recorded in SE Asia come from Oligocene (34-23 Ma) sediments of Borneo. Here, we report an occurrence of Asian dipterocarps from approximately 53 Ma old sediments from western India based on fossil resin chemistry and palynological data. An important implication of our finding is that Asian dipterocarps must have originated in Gondwana and dispersed from India into Asia once the land connection between the Indian and Asian plate was well established during the middle Eocene (49-41 Ma). Moreover, the present study supports the hypothesis which suggests that many angiosperms did not originate in the SE Asian region, but dispersed into the area from western Gondwanaland. (C) 2011 Elsevier B.V. All rights reserved.
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Publisher |
ELSEVIER SCIENCE BV
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Date |
2012-06-26T08:28:37Z
2012-06-26T08:28:37Z 2011 |
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Type |
Article
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Identifier |
REVIEW OF PALAEOBOTANY AND PALYNOLOGY,166(1-2)63-68
0034-6667 http://dx.doi.org/10.1016/j.revpalbo.2011.05.002 http://dspace.library.iitb.ac.in/jspui/handle/100/14182 |
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Language |
English
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