Plant Megaflora from the Siwalik (Upper Miocene) of Darjeeling District, West Bengal, India and its Palaeoclimatic and Phytogeographic Significance
Qualitative and chemical analysis of relic convergence so for cured from the Middle Siwalik sediments of Darjeeling precinct,West Bengal disclosed the incident of 35 new taxa owned by 18 angiospermous classifications. On the action of present dossier in addition to once famous dossier from skilled, the rebuilding of plants synopsises of Himalayan foundation piles all the while Siwalik period has happened approved and too considered on questions had connection with plant variety, endemism, and transient pathways of principally phytogeograpraphically main taxa. The reasoning of contemporary dispersion of all the renewed taxa from the domain shows that they are generally famous to happen in Northeast India, Bangladesh, Myanmar and Malayan domain unspecified area favourable critical environments are usable. About 1/3 taxa of total congregation establish to evolve soon in the Himalayan foundation hillsides of the on the east side of domain and staying 2/3 taxa are regionally obsolete. This displays that the critical changes must have captured place subsequently Mio-Piocene, opportunities. The supremacy of conifer items in present relics company displays the predominance of sweltering warm wet atmosphere accompanying much of precipitation all along the dethroning of sediments. Foliar physiognomic approach for rebuilding of palaeoclimate further plans that the Oodlabari district in the Himalayan bottom-cliffs of West Bengal experienced a sultry humidity (accompanying MAT 28.9∘C and MAP 448mm) all the while the Miocene ending. This is, still, a suggestion of correction the era atmosphere of the district accompanying discounted sleet.On the action of present relic association, the Coexistence breaks of various important limit ie. Mean annual hotness (MAT), Wormest temporal length of event or entity’s existence hotness (WMT), Coldest period hotness (CMT), and Mean annual snow (MAP) have happened supposed as 22∘C-26.5∘C, 17.8∘C -20∘C, 25∘C -30∘C, and 2650mm-3200mm individually. The additional approach, Leaf border study (LMA) implies the MAT advantage as 28.9∘C for the district all along Upper Miocene opportunities.
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.
Please see the link here: https://stm.bookpi.org/PMSDDWBIPPS/article/view/8793
Keywords: Megafossils, leaf impressions middle siwalik, upper Miocene, Himalayan foot hills, Darjeeling District, West Bengal, palaeoclimate, coexistence approach, foliar physiognomy approach, mat and map, phytogeography