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Mehrotra, R. C.
- Early Eocene (∼50 M. Y.) Legume Fruits from Rajasthan
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Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 111, No 3 (2016), Pagination: 465-467Abstract
The early Eocene (55-52 Ma) is one of the most biologically diverse intervals associated with extensive migration of biota from one land to another in the earth's history. This epoch has witnessed exceptionally warm temperature recorded in global deep marine environments, though Shukla et. al. have recently suggested cooler early Eocene temperature regime for the terrestrial biome on the basis of CLAMP analysis. The north-moving Indian subcontinent is said to be subducted beneath the Eurasian plate at this juncture, and the biota of each land mass marked its own way to move far and wide. To study these changes in deep time we have collected several plant fossils from the Gurha lignite mine (27.87398°N, 72.86709°E) in Rajasthan. Our collection contains several legume (family Fabaceae) fruits of which two are systematically described here.Full Text
- Quantification of Rainfall during the Late Miocene–Early Pliocene in North East India
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PDF Views:78
Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
2 Dr H. S. Gour Vishwavidyalaya, Sagar 470 003, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
2 Dr H. S. Gour Vishwavidyalaya, Sagar 470 003, IN
Source
Current Science, Vol 113, No 12 (2017), Pagination: 2253-2257Abstract
The monsoon rainfall contributes about 30% of the total global rainfall. The Asian monsoon system (ASM) is one of the largest systems and is of great significance in the global climate system. It consists of two subsystems, namely Indian summer monsoon (ISM)/southwest (SW) monsoon/South Asia summer monsoon (SASM) and East Asia monsoon (EAM).Full Text
References
- Wang, B. and Ding, Q. H., Dyn. Atmos. Oceans, 2008, 44, 165–183.
- Pant, G. B. and Rupa Kumar, K., Climates of South Asia, John Wiley, Chichester, 1997, p. 320.
- Kumar, P., Rupa Kumar, K., Rajeevan, M. and Sahai, A. K., Climate Dyn., 2007, 28, 649–660.
- Mahanta, R., Sarma, D. and Choudhury, A., Int. J. Climatol., 2013, 33, 1456–1469.
- Jain, S. K., Kumar, V. and Sahariad, M., Int. J. Climatol., 2013, 33, 968–978.
- Khan, M. A. et al., Global Planet. Change, 2014, 113, 1–10.
- Mosbrugger, V. and Utescher, T., Palaeogeogr. Palaeoclimatol. Palaeoecol., 1997, 134, 61–86.
- Utescher, T. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2014, 410, 58–73.
- Tiwari, R. P. and Mehrotra, R. C., Tertiary Res., 2000, 20, 85–94.
- Tiwari, R. P., Mehrotra, R. C., Srivastava, G. and Shukla, A., J. Asian Earth Sci., 2012, 61, 143–165.
- Mehrotra, R. C., Tiwari, R. P., Srivastava, G. and Shukla, A., Chin. Sci. Bull. (Suppl. I), 2013, 58, 104–110.
- Karunakaran, C., Geol. Surv. India, Misc. Publ., 1974, 30, 1–124.
- Ganju, J. J., Bull. Geol., Min. Metall. Soc. India, 1975, 48, 17–26.
- MacGinitie, H. D., Carnegie Inst. Washington Publ., 1941, 534, 1–94.
- Hickey, L. J., Geol. Soc. Am. Mem., 1977, 150, 1–183.
- Chaloner, W. G. and Creber, G. T., J. Geol. Soc. London, 1990, 147, 343–350.
- Mosbrugger, V., In Fossil Plants and Spores: Modern Techniques (eds Jones, T. P. and Rowe, N. P.), Geological Society of London, 1999, pp. 261–265.
- Liang, M. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2003, 198, 279–301.
- Uhl, D. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2007, 248, 24–31.
- Xing, Y. W. et al., Palaeogeogr. Palaeo-climatol. Palaeoecol., 2012, 358–360, 19–26.
- Bondarenko, O. V., Blochina, N. I. and Utescher, T., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2013, 386, 445–458.
- Mosbrugger, V., Utescher, T. and Dilcher, D. L., Proc. Natl. Acad. Sci. USA, 2005, 102, 14964–14969.
- Utescher, T., Bondarenk, O. V. and Mosbrugger, V., Earth Planet. Sci. Lett., 2015, 415, 121–133.
- Srivastava, G. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2016, 443, 57–65.
- Attri, S. D. and Tyagi, A., Climate Profile of India, Environment Monitoring and Research Centre, India Meteorological Department (IMD), New Delhi, 2010.
- Utescher, T. and Mosbrugger, V., The Palaeoflora database, 2015; www.palaeoflora.de
- Ramesh, B. R., Pascal, J. P., Nougier, C. and Datta, R., Endemic Tree Species of the Western Ghats India, French Institute of Pondicherry, Puducherry, CD-ROM, 1997.
- IMD, Climatological Tables of Observatories in India, Government of India Press, Nasik, 1931–1960.
- Boos, W. R. and Kuang, Z., Sci. Rep., 2013, 3, 1192.
- Lau, K. M. and Yang, S., Adv. Atmos. Sci., 1997, 14, 141–162.
- Zhang, S. and Wang, B., Int. J. Climatol., 2008, 28, 1563–1578.
- Shukla, A. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2014, 412, 187–198.
- Lin, D. et al., Geology, 2017, 45, 215–218.
- Valdiya, K. S., Prog. Phys. Geogr., 2002, 26, 360–399.
- Pascal, J. P., Ramesh, B. R. and Franceschi Dario de, Trop. Ecol., 2004, 45, 281–292.
- Mehrotra, R. C., Bera, S. K., Basumatary, S. K. and Srivastava, G., J. Earth Syst. Sci., 2011, 120, 681–701.
- Srivastava, G. et al., Palaeogeogr. Palaeoclimatol. Palaeoecol., 2012, 342–343, 130–142.
- Srivastava, G. and Mehrotra, R. C., J. Earth Syst. Sci., 2013, 122, 283–288.
- Pentamerous Fossil Flowers and Fruits from Rajasthan Reveals the Dominance of Flowering Plants in the Early Palaeogene of India
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 125, No 3 (2023), Pagination: 321-324Abstract
The dominance of angiosperms, achieved around the late Cretaceous–early Palaeogene time, can be observed through multiple well-preserved fossil flowers and fruits described from the early Palaeogene sediments of Bikaner and Barmer (Rajasthan, India). Here, we report twelve pentamerous fossil flowers categorized into three morphotypes mainly based on their petal’s shape and pattern. Fossil pollen Rhoipites anacardioides Ramanujam, extracted from the preserved androecium of one of the fossil flowers, has shown strong affinity with the modern pollen of Anacardiaceae. The pentamerous fossil fruit encompassing a single whorl of five carpels alternating with petals is similar to the extinct genus Chaneya Wang and Manchester. These fossils provide a cinematic picture of the beautiful flowering and fruiting phases during the early Palaeogene, well known for the major diversification of angiosperms.Keywords
Angiosperm, Anacardiaceae, Chaneya, Palana Formation, Rutaceae.Full Text
References
- Cui, D. F. et al., A Jurassic flower bud from China, Geol. Soc. Spec. Publ., London, 2022, 521.
- Singh, H. et al., Flowers of Apocynaceae in amber from the early Eocene of India. Am. J. Bot., 2021, 108(5), 1–10.
- Hazra, T. et al., First fossil legume flower of papilionoid affinity from India. J. Geol. Soc. India, 2021, 97, 267–270.
- Srivastava, R. et al., Pterospermumocarpon, a new malvalean fruit from the Sindhudurg Formation (Miocene) of Maharashtra, India, and its phytogeographical significance. J. Earth Syst. Sci., 2012, 121, 183–193.
- Reback, R. G. et al., Fruits of Euphorbiaceae from the Late Cretaceous Deccan intertrappean beds of India. Int. J. Plant Sci., 2021, 183(2), 128–138.
- Smith, S. Y. et al., Fossil fruits and seeds of Zingiberales from the Late Cretaceous–early Cenozoic Deccan Intertrappean beds of India. Int. J. Plant Sci., 2021, 182(2), 91–108.
- Ramteke, D. D. et al., Singpuria, a new genus of Eudicot flower from the latest Cretaceous Deccan Intertrappean Beds of India. Acta Palaeobot., 2020, 60(2), 323–332.
- Manchester, S. R. et al., Morphology and anatomy of the angiosperm fruit Baccatocarpon, incertae sedis, from the Maastrichtian Deccan Intertrappean Beds of India. Acta Palaeobot., 2019, 59(2), 241–250.
- Shukla, A. and Mehrotra, R. C., Early Eocene plant megafossil assemblage of western India: paleoclimatic and paleobiogeographic implications. Rev. Palaeobot. Palynol., 2018, 258, 123–132.
- Agnihotri, P. et al., First fossil record of a nymph (Ephemeroptera, Teloganellidae) from the Indian subcontinent. Zootaxa, 2020, 4838(1), 137–142.
- Wang, Y. F. and Manchester, S. R., Chaneya, a new genus of winged fruit from the Tertiary of North America and eastern Asia. Int. J. Plant Sci., 2000, 161, 167–178.
- Traverse, A., Why one ‘does’ paleopalynology and why it works. In Paleopalynology, Springer, Berlin, Dordrecht, 2007, 2nd edn, pp. 45–813; doi:10.1007/978-1-4020-5610-9.
- Ramanujam, C. G. K., Palynology of the Neogene Warkalli beds of Kerala state in South India. J. Palaeontol. Soc. India, 1987, 32, 26–46.
- Wodehouse, R. P., The oil shales of the Eocene Green River formation. Bull. Tor. Bot. Club, 1933, 60, 480–524.
- Assis, A. C. et al., Pollen morphology of selected species of Anacardiaceae and its taxonomic significance. Rodriguésia, 2021, 72, e01422020.
- Feng, X. X. and Jin, J. H., First record of extinct fruit genus Chaneya in low-latitude tropic of South China. Sci. China Earth Sci., 2012, 55, 728–732.
- Sauquet, H. et al., The ancestral flower of angiosperms and its early diversification. Nat. Commun., 2017, 8, 16047.