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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Tewari, Rajni

New Global Opportunities for Hydrocarbon Exploration in Neoproterozoic Basins of Indian Subcontinent

Abstract Views :231 | PDF Views:2

Authors

Naresh C. Mehrotra ¹, Rupendra Babu ¹, Rajni Tewari ¹, Neerja Jha ¹, Prabhat Kumar ², Veeru Kant Singh ¹, Manoj Shukla

Affiliations
1 Birbal Sahni Institute of Paleobotany, 53, University Road, Lucknow-226007, IN
2 Zoology Department, Lucknow University, Lucknow-226007, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 4 (2008), Pagination: 543-546

Abstract

First record of Type I matured, Liptinite organic matter facies from the Gotan Limestone (Late Neoproterozoic) in Rajasthan is considered significant. This throws open an entirely new basin for hydrocarbon exploration from the Neoproterozoic sediments in Rajasthan and other similar prospective basins in India. The palynological assemblage recorded from the studied samples also contains larve of the petroleum fly Helaeomyia (=Psilopa Coquillet) petrolei, known to live in pools of crude petroleum. The significance of the find is discussed in this brief communication.

Keywords

Hydrocarbon Exploration, Neoproterozoic Basins, Rajasthan.

Full Text

Palynology of Permian Gondwana Sequence of Umrer Coalfield, Maharashtra

Occurrence of Plant Mega- and Microfossils from Barakar and Raniganj Formations of Manuguru Area, Godavari Graben, Andhra Pradesh

Abstract Views :167 | PDF Views:2

Authors

Rajni Tewari ¹, Neerja Jha ¹

Affiliations
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 1 (2006), Pagination: 101-112

Abstract

Plant mega- and microfossils are reported in the bore core 726 from Manuguru area, Godavari Graben, Andhra Pradesh. Plant megafossils Gangamopteris sp., Glossopteris indica, G.subtilis, G. sastrii, Glosspteris sp. cf G. teluinervis, Glossopteris sp. and equisetalean axes are recorded in the sediments lithologically identified as Baraker Formation while Noeggerathiopsis hislopii, Glossopteris communis and G. stenoneura occur in the sediments lithologically recognized as Raniganj Formation. Plant microfossil studies carried out in these sediments reveal presence of three palynoassemblages, one belonging to Barakar Formation at 596-636 m and two belonging to Raniganj Formation at 379-580 m. A review of distribution of plant megafossils in Permian sediments of Godavari Graben reveals that the megafloral taxa of present study have been recorded for the first time from the Lower Gondwana of Godavari Graben. A comparative analysis of mega- and microfloral assemblages with the known stratigraphic age of Lower Gondwana sediments of Godavari Graben has also been attempted.

Keywords

Glossopteris, Megafossils, Permian, Palynology, Lower Gondwana, Manuguru Area, Godavari Graben, Andhra Pradesh.

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Plant Remains from the Upper Siwalik Sediments of West Kameng District, Arunachal Pradesh

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Authors

Ashutosh Josht ¹, Rajni Tewari ², R. C. Mehrotra ², P. P. Chakraborty ³, Anirudh De ⁴

Affiliations
1 Geological Survey of India, Lucknow, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
3 Indian School of Mines, Dhanbad, IN
4 Tcntulbena, Kolkata, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 3 (2003), Pagination: 319-324

Abstract

Three subdivisions of Siwalik, vi/ , Lower, Middle and Upper are exposed m reverse stratigraphtc order in the Kameng District of Arunachal Pradesh. A rich assemblage of plant fossils is present in the Siwalik Group of rocks. The megaplant remains including one leaf compression and cuticular fragment from the Upper Siwalik of the West Kameng District have been described. The leaf compression shows its affinities with Termmaha catappa of Combretaceae whereas the cuticular fragment is assignable to Pihpancittis Roselt and Schneider and has been described as a new species named P arunachalensis sp nov. The presence of T calappcns very significant as it points to coastal depositional environment.

Keywords

Leaf Compression, Cuticular Fragment, Termmaha Catappa, Upper Pliocene-Pleistocene, Siwalik Group, West Kameng District, Arunachal Pradesh.

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Permian Megaspores from Kuraloi Area, Ib-River Coalfield, Mahanadi Basin, Orissa

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Authors

Rajni Tewari ¹, Naresh C. Mehrotra ¹, K. L. Meena ¹, S. S. K. Pillai ¹

Affiliations
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 74, No 6 (2009), Pagination: 669-678

Abstract

Heterogenous megaspores recovered from the Upper Permian sediments of Kuraloi Area, Ib-River coalfield, have been systematically described. The megaspore assemblage includes seven genera with seventeen species viz. Bokarosporites rotundus, Banksisporites indicus, B. utkalensis, Biharisporites spinosus, Biharisporites sp. A, Biharisporites sp. B, Jhariatriletes baculosus, J. srivastavae, J. damudicus, Manumisporites distinctus, Singhisporites baculatus, S. radialis, S. surangei, Ramispinatispora indica, R. nautiyalii and Ramispinatispora sp. Additionally, a new species of Ramispinatispora viz. R. mahanadiensis has been identified. Associated spore pollen assemblages are suggestive of a Late Permian age corresponding to Raniganj/Kamthi Formation. Raniganj megaspores are known from Damodar and Godavari Basins. The newly recorded megaspore assemblage from the Ib-River coalfield is comparable to that of Raniganj/Kamthi Formation of Godavari Graben. The diversity in exosporium ornamentations indicates structural diversity. Moreover, their prolific presence ultimately points towards occurrence of heterosporous source vegetation in the area.

Keywords

Megaspores, Raniganj, Ib-River Coalfield, Mahanadi Basin, Orissa.

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References

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Palynological Dating and Correlation of Surface and Subsurface Sediments from Wardha Valley Coalfield, Maharashtra

Abstract Views :204 | PDF Views:0

Authors

Neerja Jha ¹, K. Pauline Sabina ¹, Rajni Tewari ¹, N. C. Mehrotra ¹

Affiliations
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 77, No 2 (2011), Pagination: 137-148

Abstract

42 genera of palynomorphs have been reported from the qualitative and quantitative analysis of the palynoflora from both open cast mine and bore holes viz., Ballarpur open cast mine, Durgapur open cast mine and Bore hole CMWNM-57 on barrier between Kawadi/Majri open cast and Hindustan Lalpeth Colliery from the Wardha valley coalfield of Wardha basin. Two palynoassemblages have been recorded i.e., an Upper Karharbari palynoassemblage comprising dominance of radial monosaccate genus Parasaccites and subdominance of nonstriate disaccate genus Scheuringipollenites and a Lower Barakar palynoassemblage consisting of dominance of Scheuringipollenites and subdominance of striate disaccates chiefly Faunipollenites, suggesting an Early Permian age (Late Sakmarian to Early Artinskian) to the sediments. It is further authenticated by the occurrence of palynotaxa viz., Crucisaccites, Caheniasaccites, Indotriradites and Tiwariasporis. Upper Karharbari Formation has been demarcated for the first time in lithologically designated Barakar Formations in Ballarpur, Durgapur, Majri and Hindustan Lalpeth Colliery while the sample 57/2 of bore hole CMWNM from Kawadi area may belong to the Kamthi Formation on the basis of pinkish yellowish coarse grained to medium grained sandstone. An attempt has been made to correlate these palynoassemblages with other Lower Gondwana basins of Early Permian affinity.

Keywords

Palynomorphs, Early Permian, Upper Karharbari, Lower Barakar, Correlation, Wardha Valley Coalfield, Maharashtra.

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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

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 2 (2011), Pagination: 109-116

Abstract

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.

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