1. Quaternary Palynology Laboratory, Birbal Sahni Institute of Palaeosciences (BSIP), Lucknow, Uttar Pradesh, India;
2. CLSM & Raman Spectroscopy Laboratory, Birbal Sahni Institute of Palaeosciences (BSIP), Lucknow, Uttar Pradesh, India;
3. Botanic Garden, Floriculture and Landscape Division, CSIR-National Botanical Research Institute (NBRI), Rana Pratap Marg (NBRI), Lucknow, Uttar Pradesh, India