Illora Sen's research while affiliated with University of Calcutta and other places

Publications (5)

Article
To assess the pattern of climatic evolution during the late Miocene to early Pleistocene in the largest fluvio-deltaic sedimentary system on the Earth, the Bengal Basin (BB), a quantitative palaeoclimatic reconstruction was made, based on 20 fossil wood floras. Those floras show that moisture-loving taxa have decreased considerably since the Miocen...
Article
Polar transport of the phytohormone auxin is a well-known physiological phenomenon recorded in different extant plant groups including bryophytes and pteridophytes. Earlier, this phenomenon has been recorded in an Upper Devonian (375 million-year) arborescent progymnosperm, Archaeopteris. Since then further record of such occurrence of polar auxin...
Article
Thirteen taxa of fossil dicotyledonous woods are described from the Tipam Sandstone (Mio-Pliocene) and Dupi Tila Formations (Plio-Pliestocene) of Bangladesh. Their anatomical characters suggest affinities to Anacardiaceae, Burseraceae, Clusiaceae, Dipterocarpaceae, Fabaceae, Lecythidaceae, Meliaceae and Moraceae. These fossil woods demonstrate a hi...
Article
Full-text available
The paper describes a fossil wood of Fabaceae, Hopeoxylon assamicum Lalitha and Prakash from the Tertiary deposits of Burdwan District, West Bengal. Xylotomical features of the fossil wood closely resemble the wood anatomy of extant genus Sindora Miq. This is the first record of the occurrence of Sindora from the Tertiary of West Bengal. Distributi...

Citations

... It was formed due to the collision of the Indian and Eurasian plate and preserves palaeoenvironmental records dating back to the late Mesozoic (Alam 1989;Roy and Roser 2013). Interestingly, the BB records a large number of fossil woods which helped to explore the vegetation and climate of this region during the Neogene (Chowdhury and Tandon 1952;Ghosh and Taneja 1961;Ghosh and Kazmi 1961;Deb and Ghosh 1974;Ghosh and Roy 1978, 1979a, b, c, d, 1980, 1981, 1982Ghosh 1979, 1980;Prakash 1980, Bande andSrivastava 1989;Acharya andRoy 1986, Agarwal et al. 1989;Bera and Banerjee 1990, Bera et al. 2000Awasthi et al. 1994Awasthi et al. , 2000Poole and Davies 2001, Sen et al. 2004Mehrotra and Bhattacharyya 2002;Mehrotra et al. 2006Mehrotra et al. , 2017Sen and Bera 2005;Biswas et al. 2019). Fossil woods, especially selected features of dicotyledonous wood, have ecologic and/or phylogenetic significance such as the presence/absence of growth rings, mean tangential diameter of vessel lumina, vessel frequencies, vessel grouping, perforation plate, porosity, intervessel pits, paratracheal and apotracheal axial parenchyma and rays cellular composition. ...
... Fossil wood provides a unique dataset for palaeoenvironmental and palaeoclimatic reconstructions (Falcon-Lang, 2005). The Nearest Living Relative (NLR) of the present fossil specimen, along with NLRs of earlier described fossil taxa from the same region (Ghosh, 1943;Banerjee, 1990, 2001;Guleria, 1992;Sen et al., 2004Sen et al., , 2012Biswas et al., 2019) support the prevalence of tropical evergreen forests indicating warm and humid climatic conditions in the region. This is consistent with our earlier quantitative climatic parameters indicating a week monsoonal tropical climate made by a CLAMP (Climate Leaf Analysis Multivariate Program) analysis on different morphotypes of fossil leaves from the sub-Himalayan West Bengal (Khan et al., 2014) and Chotanagpur Plateau of eastern India, adjacent to the present study area (Hazra et al., 2020). ...