Jyotsana Rai

Jyotsana Rai
Birbal Sahni Institute of Palaeobotany · Microplankton

Ph.D.

About

70
Publications
28,975
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844
Citations
Citations since 2017
9 Research Items
317 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
Skills and Expertise

Publications

Publications (70)
Article
Full-text available
Serpulids are marine filter‐feeding annelids that live in calcareous tubes. Their distribution, colonization, and proliferation are dependent on physical environmental variables, including energy conditions. This article documents the occurrences of serpulid colonies over opportunistic colonizing trace fossil of Ophiomorpha‐rich sedimentary unit in...
Chapter
Full-text available
The transition from super hot Cretaceous to transient Palaeogene climate and therein reasonably fast northward movement of island Indian plate from equatorial tropics to buckling with Tibetan plate after subducting and engulfing the Tethys Sea and giving rise to lofty Himalayas, affected the oceanic current patterns and both fanua and flora drastic...
Article
Explosive volcanic events often produce pyroclastic materials that can be recognized from the geological record. These discrete pyroclastics form regional marker beds. Here we report the occurrence of a tephra layer interbedded within very thick coal beds near Mukah, Sarawak, Borneo. Traceable for tens of kilometers in the Mukah area of Sarawak, th...
Article
Two samples were analysed from the lowermost Patasar Shale Member of the Patasar Tank section on the western margin of the Wagad Uplift in the Kachchh Basin of Gujarat, western India. One of the samples produced an abundant, diverse and well-preserved palynobiota. The other sample produced a significantly sparser association, but of similar charact...
Article
Bay of Bengal is a shallow marine basin exposed to seasonal fluctuation in precipitation and run-off. Thus, salinity, temperature, nutrient and productivity vary along the latitudinal and onshore-offshore gradient in the Bay of Bengal. These parameters directly affect primary productivity, including that of dinoflagellate cysts. The spatial distrib...
Article
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The present paper deals with the record of rich and highly diversified calcareous nannofossil assemblage of Late Albian to Early Maastrichtian age from the subsurface sediments of Jaisalmer Basin, western India. The nannofossil assemblage include, 222 species belonging to 86 genera and 22 families including 6 nannolith families which are Braarudosp...
Article
Full-text available
We document two new forms of the bennetitalean genus Williamsonia, Williamsonia sp. A and Williamsonia sp. B, along with other fossil flora, such as horsetails and conifers, wood logs, flowers, and seeds (Carpolithes sp.) from the Middle Oxfordian Kanthkot Ammonite Beds (KAB), Washtawa Formation, exposed in the Wagad region of the Kachchh Basin, we...
Article
The 2-m-thick Wood-Log Bed is a highly ferruginous Middle Oxfordian rock unit exposed in the dry bed of the river Tramau in the Wagad Uplift of the eastern Kachchh Basin, western India, and composed of several layers. The bed contains, at several levels, permineralised conifer wood logs, seeds (Carpolites), cones (Araucarites), leaves (Brachyphyllu...
Article
Full-text available
Two gymnospermous fossil woods Araucarioxylon wagadensis n. sp. and Podocarpoxylon gangtaensis n. sp. have been described for the first time from the younger part of the Gadhada formation exposed around the core of the central dome of the Gangta Bet. The ammonites recorded from the Gangta Bet by earlier workers suggest that these fossil woods come...
Article
Full-text available
We report here moderately diversified, fairly well-preserved calcareous nannofossil assemblage of Priabonian age comprising twenty three species from the Rewak Formation exposed along the Siju-Rewak road section, West Garo Hills, Meghalaya. Out of the fifty five samples, forty seven were collected from the lower part of the Rewak Formation and only...
Data
Full-text available
Article
The environmental and climatic conditions prevalent during the transition from Cretaceous-Tertiary boundary (KTB) that caused extinction of marine and terrestrial fauna have been among the intensively studied geological phenomena. Cataclysmic meteoritic impact, Deccan volcanism, sea level fluctuation, acid rain, ocean acidification, contamination o...
Article
Full-text available
An integrated study based on calcareous nannofossils, organic-walled dinoflagellate cysts, and ammonites from the Washtawa and Kanthkot formations of the Wagad Uplift have allowed a detailed documentation of the stratigraphic position of these formations within the Oxfordian and Kimmeridgian sediments of the Kachchh Basin, western India. The nannof...
Article
Full-text available
Dino agellates are one of the major phytoplankton groups of the marine system. The onshore-offshore trends exhibited by dino agellate cysts are important criteria to decipher palaoenvironmental and palaeo-oceanographic changes. Several studies have been carried out on the organic-walled dino agellate cyst distribution pattern in surface sediment...
Article
Full-text available
Uddandam P., Rai J., Prasad V., Joshi H. & Nigam R. 2015. Holocene calcareous nannoplanktons from the western continental shelf of Bay of Bengal. Geophytology 45(2): 00-00. Sixty six surface sediment samples from the northern and western Bay of Bengal were analysed for the study of calcareous nannoplanktons. The samples were also studied for the na...
Conference Paper
Full-text available
A moderately diversified, well preserved, low frequency nannofossil assemblage with over twenty species is recorded from one (S-13) calcareous marl sample of the Ariyalur Formation situated north of the village Aladi. The assemblage includes the latest Maastrichtian index species Micula prinsii . Preservation is good and although specimens are over...
Article
Full-text available
Geoheritage sites are those sites identified and protected for their value in geoscience and aesthetics. Worldover, serious efforts are being made to identify, categorize an protect such sites. A more or less complete stratigraphic record of Barremian-Danian along with diverse fossil, sedimentary structural and other features occur in the region bo...
Article
Full-text available
We report here Mio - Pliocene age calcareous nannofossil assemblage from limited levels of Tuirial Bungalow, Tuirial Prayer Point and Ruata Quarry sections near Aizawl, Mizoram which is the north-easternmost state of India. Tripura- Mizoram accretionary belt is the southern extension of the Surma Basin which is an outer arc basin lying within the g...
Article
Full-text available
Early-Middle Albian calcareous nannofossil assemblage comprising 55 species has been recovered from the Pariwar Formation, Jaisalmer Basin, western India. The nannofossils are moderate to well-preserved and are calibrated with Early-Middle nannofossil zones CC7-CC8 of Albian age. The present record of nannofossils indicates a marine depositional en...
Article
Full-text available
A more or less complete Upper Cretaceous – Palaeocene age sequence is preserved in the Ariyalur- Pondicherry depression of the Cauvery basin. The Cretaceous-Tertiary boundary (KTB) has been recognized in this basin. Geochemical and isotopic anomalies with sequence stratigraphic framework from this 236 m thick Maastrichtian-Danian section in this ba...
Chapter
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The Kallamedu Formation, deposited during Late Maastrichtian is the thickest and largest sprawling non-marine/coastal stratigraphic unit of the Ariyalur Group, Cauvery basin, South India. However, it had attracted scanty attention from geoscientists owing to its poorly fossiliferous and weathered nature besides the paucity of good exposures. Unders...
Data
The present paper deals with the record of well preserved and diverse early-middle Albian nannofossils recovered from Tanot # 1 (Oil India Limited), drilled in the Jaisalmer Basin, Rajasthan, western India. Early Cretaceous (Aptian-Albian) marine sediments are known from the western (Jaisalmer and Kachchh basins) and the eastern continental margins...
Article
Full-text available
A fairly rich and moderately diversified nannofossil assemblage comprising thirty-eight species belonging to eighteen genera and one calcareous dinoflagellate species are described from subsurface samples of Tanot #1 well (Oil India Limited) representing the Bandah Formation of the Jaisalmer Basin. The assemblage though contains little overgrowth i...
Article
Full-text available
Late Paleocene to early Eocene (~56 to 51 Ma) interval is characterized by five distinct transient warming (hyperthermal) events (Paleocene–Eocene thermal maximum (PETM), H1/ETM2/ELMO, H2, I1 and I2) in a super greenhouse globe associated with negative carbon isotope excursions (CIEs). Although well-documented marine records exist at different lati...
Data
Bulletin of the Mizunami Fossil Museum, no. 39 (2013), p. 39–45, 2 figs., 1 pl. © 2013, Mizunami Fossil Museum Three species of crabs are here reported from the Lower Miocene Khari Nadi Formation at Matanomadh and Lakhpat sections, Western India. Philyra karkata new species is included. Palaeocarpilius cf. P. rugifer Stoliczka, 1871 is first report...
Article
Full-text available
A moderately diversified, well preserved, low frequency nannofossil assemblage with over twenty species is recorded from one (S-13) calcareous marl sample of the Ariyalur Formation situated north of the village Aladi. The assemblage includes the latest Maastrichtian index species Micula prinsii. Preservation is good and although specimens are overg...
Article
Full-text available
The oldest rocks within the Kachchh Basin belong to the sediments of Kaladongar Formation exposed in Kuar Bet, Pachchham Island (western India). The Formation's lowest unit, the Dingi Hill Member has yielded a moderately diversified calcareous nannofossil assemblage that includes the marker species of Lotharingius contractus and Triscutum sullivani...
Article
Full-text available
Siliceous spicules of endoskeletal dinoflagellates constitute a very small fraction of siliceous microfossil assemblage from Southern Ocean. They are represented by a solitary genus Actiniscus with its type species A. pentasterias. They are bilaterally symmetrical. It is useful in deriving palaeoecological interpretations. Their association with ag...
Article
Full-text available
Jurassic nannofossils are scarcely known from the Indian subcontinent. We report here a well-diversified and moderately preserved Early Callovian nannofossil assemblage comprising twenty-one species recovered from the Kuldhar Member, Jaisalmer Formation, Rajasthan, western India, which is exposed along the banks of the Masrudi river, adjacent to th...
Article
Full-text available
The world-famous Mesozoic rocks of Kutch exposed in the western sector of India have been originally classified into the Patcham, Chari, Katrol and Umia formations in ascending order along with a later scheme of Jhurio, Jhumara, Jhuran and Bhuj formations. Ammonites are the best for dating marine Mesozoic succession the world over. The Kutch Mesozo...
Article
Siliceous spicules of endoskeletal dinoflagellates form a very small part of the siliceous microfossil assemblage from Neill Island, Ritchie's Archipelago, Andaman Island and Nicobar Island. They are represented here by a solitary genus Actiniscus, with two species - Actiniscus pentasterias and Actiniscus elongatus. Light microscopy, supported by s...
Article
Abstract We report the first record of Bathonian–Callovian calcareous nannofossils from a marine sedimentary sequence of the eastern Karakoram block, in northern India. The calcareous mudstones and packstones, occasionally bearing red chert nodules, yielded calcareous nanofossils and Middle Jurassic Choffatia furcula ammonoids. Middle to Upper Jura...
Article
Full-text available
A moderately preserved but diverse nannofossil assemblage comprising over twenty five species has been recovered from the calcareous mudstone of the basal part of Jara Dome in the northwestern part of Kachchh mainland. The assemblage contains Ansulasphaera helvetica, Axopodorhabdus cylindratus, Calolithus martelae, Crepidolithus crassus, Cyclagelos...
Article
We hypothesized that ratios of pro- to anti-inflammatory cytokines can be associated with hepatic, cardiac, and renal function after a severe trauma and can be used as predictors for clinical outcome. Furthermore, insulin-like growth factor-I (IGF-I) in combination with its principle binding protein (IGFBP-3) equilibrates pro- to anti-inflammatory...
Article
Background We hypothesized that ratios of pro- to anti-inflammatory cytokines can be associated with hepatic, cardiac, and renal function after a severe trauma and can be used as predictors for clinical outcome. Furthermore, insulin-like growth factor-I (IGF-I) in combination with its principle binding protein (IGFBP-3) equilibrates proto anti-infl...
Article
Hepatocyte growth factor (HGF) has been shown to modulate the acute-phase response in vitro. The specific in vivo role of HGF in this multifactorial response, however, remains unknown. This study examines the effects of exogenous HGF on the acute-phase response in thermally injured rats. Prospective, randomized, laboratory study. Shriners Hospital...
Article
The effects of exogenous recombinant human growth hormone (rhGH) on hepatic acute phase reactant proteins, cytokine expression, and liver morphology were studied in thermally injured rats to define whether rhGH alters the acute phase response. Sprague-Dawley rats (56 males) receiving a 60% TBSA third-degree scald burn were randomly divided into two...
Article
Electrical injuries currently remain a world-wide problem. This study determines whether electrical injuries at our institution have changed in the past 30 years, and identifies electrical burn complications and any high-risk groups. From 1967 to 1997, 185 children admitted to our institute were identified with electrical burns. Fifty-five percent...
Article
Introduction: Electrical injuries currently remain a world-wide problem. This study determines whether electrical injuries at our institution have changed in the past 30 years, and identifies electrical burn complications and any high-risk groups. Methods: From 1967 to 1997, 185 children admitted to our institute were identified with electrical bur...
Article
A total of 184 cases of acute diarrhoea, in patients aged 1-36 months, were studied clinicobacteriologically. Enteropathogens were isolated in 22.28% cases. Campylobacter jejuni was isolated from 2.17% cases only. Salmonellae were isolated from 7.6% cases and 64.28% of them were S typhimurium. More than 75% of all isolates of salmonellae, shigellae...
Article
The nucleating behavior of partially wettable, water insoluble planar substrate has been studied. The rate and probability of nucleation were found to be enhanced in ion induced nucleation. It is found that there exists a threshold for angle of contact above which the effect of ions is dominant. The effect of ions is more pronounced at low supersat...
Article
The equipment and the experimental techniques used for the measurement of the ratio (R) of the parallel and perpendicular electric field components of atmospherics are described. The atmospherics were recorded at Roorkee, India, on June 22 and 24, 1985, when there were just one or two scattered cloud cells without lightning and substantial noise wa...
Article
The development of abnormal growth in the form of needles, dendrites and rod-like platelets in single crystals of tin iodide (SnI2) as a function of the concentration of feed solution in silica gels is reported. A brief description of the preparation of the material and the growth procedure is given. The effects of gel aging, of the concentration o...
Article
(010) cleavage surfaces of magnesium orthosilicate crystals were chemically etched in concentrated HCl solution, in HCl vapour at room temperature and in NaOH and KOH melts at 400 °C. These cleavage surfaces were also thermally etched at various temperatures ranging from 1100 to 1200 °C, and the chemical and thermal etch patterns were compared. It...

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