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- R. K. Kar
- K. Ambwani
- D. Dutta
- Ratan kar
- Suresh C. Srivastava
- R. S. Singh
- Reshmi Chatterjee
- Amit K. Ghosh
- G. M. Narasimha Rao
- Ruchika Bajpai
- Kriti Mishra
- Rahul Mohan
- Vartika Singh
- Anjum Farooqui
- Naresh C. Mehrotra
- Dhruv Sen Singh
- Rajni Tewari
- Neerja Jha
- Swati Dixit
- Md. Firoze Quamar
- Birbal Sahni
- M. Firoze Quamar
Journals
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Kar, Ratan
- Major Floral Turnover at Mahadeo-Langpar Formational Boundary above K/T Iridium Layer: Is it Facies Controlled?
Abstract Views :185 |
PDF Views:2
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 180-188Abstract
The Um Sohryngkew river section at Therriaghat, Meghalaya, exposes Mahadeo (Maastrichtian) and Langpar (Danian) Formations extensively. The palynological investigation of the topmost Mahadeo and lowermost Langpar reveals an abrupt change in palynoflora at the formational boundary. The Maastrichtian index palynofossils viz. Azolla cretacea, Ariadnaesporites ariadnae, Mulleripollis bolpurensis etc. disappear at the uppermost Mahadeo. At the basal Langpar the assemblage is dominated by fungal and algal elements. On this basis the palynofacies turnover is demarcated within a 40 cm thick calcareous sandy shale underlain by the 3 cm thick highly carbonized shale. The palynological boundary corresponds with the lithological one demarcated by Pandey(1978, 1981), and is located 10 m above the foraminiferal, nannofossil, dinoflagellate boundary approximating the iridium rich level. The palynological data suggest no major catastrophic event at the iridium level with the major taxa continuing through. The major palynological break reported in this paper is at formational boundary and may be facies controlled as well.Keywords
Palynology, Mahadeo-Langpar Formations, Iridium Layer, K/T Boundary, Um Sohryngkew River, Meghalaya.
- Palynological Delimitation of the Coal Bearing Lower Gondwana Sediments in the Southern Part of Tatapani-Ramkola Coalfield, Chattisgarh, India
Abstract Views :183 |
PDF Views:2
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226007, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow-226007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 557-564Abstract
Coal and carbonaceous shale samples from bore-hole TRSS-1, located in the southern part of Tatapani Ramkola Coalfield have been palynologically analysed. Surface sediments exposed in the vicinity of the bore-hole, along Suknaiya nala, were also examined to ascertain their stratigraphic position vis-a-vis the bor' "oIe sediments. On the basis of quantitative dominance, three assemblage zones have been distinguished. which in ascending order are: (i) Parasaccites-Callumispora palynoassemblage zone, (ii) Scheuringipollenites maxim us palynoassemblage zone and (iii) Faunipollenites-Scheuringipollenites palynoassemblage zone. The first two assemblage zones have been demarcated in bore-hole TRSS-1 and represent Upper Karharbari and Lower Barakar palynozones respectively. The third assemblage zone has been recorded in Suknaiya nala and represents Upper Barakar palynozone.Keywords
Palynology, Gondwana Sediments, Palynomorphs, Assemblage Zones, Tatapani-Ramkola Coalfield, Chattisgarh.- Earliest record of slime moulds (Myxomycetes) from the Deccan Intertrappean beds (Maastrichtian), Padwar, India
Abstract Views :250 |
PDF Views:85
Authors
Ratan Kar
1,
R. S. Singh
1
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 107, No 8 (2014), Pagination: 1237-1239Abstract
No Abstract.Full Text
- Dwarfism and Lilliput Effect: A Study on the Glossopteris from the Late Permian and Early Triassic of India
Abstract Views :217 |
PDF Views:84
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
2 Department of Botany, Andhra University, Visakhapatnam 530 003, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
2 Department of Botany, Andhra University, Visakhapatnam 530 003, IN
Source
Current Science, Vol 107, No 10 (2014), Pagination: 1735-1744Abstract
The 'Lilliput effect' represents the phenomenon whereby there is a pronounced reduction in the size of biota associated with the aftermath of mass extinction. This fact has been supported by the evidence of dwarfism both in invertebrates and vertebrates recorded after the end-Permian mass extinction event. The extinct genus Glossopteris belonging to seed ferns Glossopteridales is one of the best known fossil taxon that flourished during the Permian and continued its existence till Triassic. In contrast to the Permian, the Triassic was a time when greenhouse conditions with an increased temperature and widespread aridity prevailed as evidenced by the global dataset. The new set of environmental conditions in the Triassic posed a major challenge for the existing Glossopteris lineage, whereby the smaller forms (dwarfs) with reduced leaf surface area continued and sustained. The present study from different late Permian and early Triassic formations of India is aimed at unravelling the changes in morphological traits of seven species of Glossopteris leaves whose existence continued surpassing the Permian-Triassic mass extinction event.Keywords
Dwarfism, Extinction Event, Glossopteris, Lilliput Effect, Permian–Triassic Boundary.Full Text
- Modern Pollen Rain in Kedarnath:Implications for Past Vegetation and Climate
Abstract Views :274 |
PDF Views:119
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 110, No 3 (2016), Pagination: 296-298Abstract
No Abstract.Full Text
- National Conference on Climatic Changes During the Quaternary: Special Reference to Polar Regions and Southern Ocean
Abstract Views :180 |
PDF Views:118
Authors
Rahul Mohan
1,
Ratan Kar
2
Affiliations
1 NCAOR, Goa, IN
2 BSIP, Lucknow, IN
1 NCAOR, Goa, IN
2 BSIP, Lucknow, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 2 (2010), Pagination: 447-448Abstract
No Abstract.Full Text
- Late Pleistocene and Early Holocene Climate of Ny-Alesund, Svalbard (Norway): A Study based on Biological Proxies
Abstract Views :201 |
PDF Views:2
Authors
Vartika Singh
1,
Anjum Farooqui
1,
Naresh C. Mehrotra
1,
Dhruv Sen Singh
2,
Rajni Tewari
1,
Neerja Jha
1,
Ratan Kar
1
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow – 226 007, IN
2 Centre for Advance Studies in Geology, Lucknow University, Lucknow – 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow – 226 007, IN
2 Centre for Advance Studies in Geology, Lucknow University, Lucknow – 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 2 (2011), Pagination: 109-116Abstract
Subsurface sediments of a 120 cm deep trench from Ny-Alesund, Svalbard, were analysed for pollenspores and other organic matter contents. This study is supported by two AMS 14C dates (27, 200 yrs BP and 8,762 yrs BP) at the bottom and topmost litho-unit of the trench, respectively. The pollen record provides an evidence of a warm interval at about 27,200 yr BP (Late Weichselian and MIS 3) and cooling episode around 8,762 yr BP. This is also supported by the amount and type of organic matter as well as sediment type and depositional history of the trench sediments.Keywords
Biological Proxies, Trench Section, Late Weichselian, Ny-Alesund, Svalbard.References
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- Late Pleistocene–Holocene Vegetation and Climate Change From the Western and Eastern Himalaya (India): Palynological Perspective
Abstract Views :229 |
PDF Views:85
Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeosciences, Lucknow 226 007, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 195-218Abstract
A palynological assay of the studies carried out from the Western and the Eastern Himalaya (India) during the Late Pleistocene and Holocene is presented here. The Western Himalaya is affected by both the Indian Summer Monsoon (ISM) and Western Disturbances, whereas the Eastern Himalaya receives precipitation only from the ISM. During the Late Pleistocene (~77 ka), a cold and arid climate supported steppe vegetation in the Western Himalaya. In the Eastern Himalaya, around 66 ka, a cool and dry climate supported the savannah vegetation with few scattered trees of Pinus and Tsuga. A number of warm-moist fluctuations are also perceptible during the Late Pleistocene. The impacts of Last Glacial Maximum, Holocene Climatic Optimum, Medieval Warm Period and Little Ice Age are well discernible in the vegetation in both the regions. Within a broad similarity, the climate change and associated vegetation succession varied from region to region; as the palynological records are characterized by the evidences of prolonged humid phases in the eastern sector, whereas the arid events are better marked in the western part. The similarities and incompatibilities in the climate and vegetation between the Western and Eastern Himalaya during the Late Pleistocene and Holocene are discussed in the present paper.Keywords
Climate Change, Himalaya, India, Palaeopalynology, Vegetation Dynamics.Full Text
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