Plant Megaflora from the Siwalik (Upper Miocene) of Darjeeling District, West Bengal, India and its Palaeoclimatic and Phytogeographic Significance | Book Publisher International

 Qualitative and chemical analysis of relic assemblage so for cured  from the Middle Siwalik sediments of Darjeeling precinct,West Bengal told the occurrence of 35 new taxa owned by 18 angiospermous offspring. On the support of present dossier as well as then popular dossier from there, the rebuilding of plants sketches of Himalayan foot hillsides all the while Siwalik period has been finished and further examined on problems had connection with plant difference, endemism, and seasonal pathways of for the most part phytogeograpraphically important taxa. The reasoning of contemporary dispersion of all the recovered taxa from the domain shows that they are mainly popular to occur in Northeast India, Bangladesh, Myanmar and Malayan domain unspecified area favourable critical conditions are handy. About 1/3 taxa of total convergence erect to evolve presently in the Himalayan pad cliffs of the easterly region and surplus 2/3 taxa are regionally dead. This indicates that the critical changes must have captured place later Mio-Piocene, times. The supremacy of conifer ingredients in present relics assemblage displays the predominance of equatorial warm humid environment accompanying abundance of rainfall all the while the dethroning of sediments. Foliar physiognomic approach for rebuilding of palaeoclimate further suggests that the Oodlabari extent in the Himalayan paw-hillsides of West Bengal enjoyed a steamy trend (accompanying MAT 28.9∘C and MAP 448mm) all the while the Miocene period. This is, still, opposite to the day humidity of the district accompanying reduced storm.On the support of present relic assemblage, the Coexistence breaks of various important limit ie. Mean annual temperature (MAT), Wormest temporal length of event or entity's existence hotness (WMT), Coldest temporal length of event or entity's existence temperature (CMT), and Mean annual drizzle (MAP) have existed supposed as 22∘C-26.5∘C, 17.8∘C -20∘C, 25∘C -30∘C, and 2650mm-3200mm respectively. The different approach, Leaf border reasoning (LMA) suggests the MAT advantage as 28.9∘C for the extent all along Upper Miocene periods.

Author(s) Details:

Mahesh Prasad,
Birbal Sahni Institute of Palaeosciences, Lucknow -226007, U.P., India.

. Shashi,
Department of Botany, Shiv Harsh Kisan P.G. College, Basti-272001, U.P., India.

Shivendra Mohan Pandey,
Department of Botany, Shiv Harsh Kisan P.G. College, Basti-272001, U.P., India.

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