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Rajasthan is known for the dry geography including the great
Thar Desert. However, it had lush
evergreen vegetation with lagoons about 55 million years ago, says a new study, as palentologists have found the fossil of a coconut like fruit from the Kapurdi
village in Barmer district of Rajasthan.
According to the study which is published in the latest
issue of the Journal of Bioscience, the fruit has close relation with the present
day coconut palms. It indicates that the environmental conditions in the area
were supportive to the growth of coconut like palms which are usually found in the
coastal ecosystems with relatively good rain fall, says the study.
“Its presence indicates warm, humid, possibly coastal
conditions during the Early Eocene in Rajasthan, in contrast to the present-day
dry and desertic climatic conditions occurring there. This finding, along with
earlier described evergreen taxa at the site, indicates that the climate of
Rajasthan was much better and luxuriant to support the growth of these
evergreen taxa”, says the study.
Moreover, the new finding is also in line with earlier
studies which have recovered fossils of evergreen vegetation, crabs, fishes, turtles
and other aquatic organisms from here, indicating the existence of lagoon like
ecosystems 55 million years ago.
According to the study, the uplift of the Himalayas and the Tibetan
plateau could be the reasons which have contributed to a drastic change in the
environmental conditions of the region, making it dry and arid.
A close relative of today’s
coconut
The fruit fossil has two eyes and longitudinal ridges on the
surface, making it similar to coconuts. The fibers of the husk are also
longitudinally distributed as in a coconut fruit, says the study. Moreover, the
11.7 cm long and 5.8 cm wide fibrous fruit in ovoid shape resembles Cocos nucifera fruit than that of any
other subspecies among the coconut palms.
The fruit was earlier identified as Cocos sahnii, when famous botanist Professor Kailas Nath Kaul found its
fossil from the same area in 1951. But the study did not scientifically
describe the species, as the fossil was an impression of the hard inner layer
of the fruit on a stone. However, the new study has analyzed
another fossil which has the mesocarp of the fruit (which is similar to the husk
of the coconut fruit) intact, to establish its relation with coconut fruits.
Anumeha Shukla, Rakesh C Mehrotra and Jaswant S Guleria of
Birbal Sahni Institute of Palaeobotany, Lucknow has conducted the study.
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