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Dr. Naresh Chandra Mehrotra Ph.D. in Geology from Lucknow University took over as Director, Birbal Sahni Institute of Palaeobotany w.e.f. 1st March 2005. Dr. Mehrotra joined Oil and Natural Gas Commission in 1980 as Palynologist after serving Birbal Sahni Institute of Palaeobotany (1972–77) and Wadia Institute of Himalayan Geology (1977–1980). At K.D.M.Institute of Petroleum Exploration, Dehra Dun, he worked for Science and Technology project to evaluate the hydrocarbon potential of Andaman Basin and established Paleogene–Neogene palynostratigraphy of Andaman Islands.Dr. Mehrotra visited University of Saskatchewan, Canada (1982–1984) as post-Doc Fellow on Government of India National Scholarship to carry out studies on “Phytoplankton in Oil Exploration”.He joined the Regional Geological Laboratories ONGC at CRBC, Calcutta in 1986 to establish Palynology Laboratory and served as Head of Regional Geological Laboratory. In 1991 he returned to the Central Palynological Laboratory at Dehra Dun and served as Head of the Palynology Laboratory at KDMIPE (1996 – Feb., 2005). The responsibilities at ONGC labs included palynostratigraphic data backup to exploration efforts in the form of various contract, sponsored, research and essential projects. It involves preparation of paleogeographic and paleoenvironmental facie's maps; potential source rock facie's delineation; development of sequence biostratigraphy; and data integration to support geological modeling. Dr Mehrotra has thirty-eight years of professional experience in exploration palynology including systematics and morphology of dinoflagellate cysts and spores and pollen; palynostratigraphic, palaeoenvironmental and source rock evaluation research related to hydrocarbon exploration. In ONGC Dr. Mehrotra rose to the position of Deputy General Manager and Head Palynology. |
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Major Scientific contributions of N.C. Mehrotra
| Major Scientific contributions of N.C. Mehrotra |
Stratigraphy of sedimentary basins of India is built upon the fossil data. In the past few decades, palynofossils have played a major role in building the biostratigraphy of petroliferous basins of India, more significantly in areas where micropaleontological data is poor, besides solving many complex stratigraphic problems and suggesting new areas for exploration.
“Palynology in Hydrocarbon Exploration – the Indian Scenario” (Part-I) is a co-authored memoir in which 50 years of published information on petroliferous basins is detailed. The volume includes numerous scientific contributions which have helped build the palynostratigraphy of Cambay, Mumbai Offshore, Krishna-Godavari, Cauvery and Assam-Arakan basins and their source rock evaluation. This is based on integrated palynological data tied up with lithostratigraphy. The volume serves as a handy database for stratigraphic studies.
High resolution palynological biostratigraphy is based on phytoplankton. Dinoflagellates, one such important group of microfossils was least understood and documented by most Indian palyologists till mid eighties when a series of joint publications by Mehrotra and Sarjeant (7 Publs.) were brought out from East Coast of India. The latter were the first to document, describe and illustrate their complex morphologies from India. These proved very useful to biostratigraphers, particularly those associated within hydrocarbon exploration because of their immense biostratigraphic value and paleoceanographic significance.
“Palynology in Hydrocarbon Exploration (Part-II) : Spatial and temporal distribution of selected spores/pollen and dinoflagellate cyst taxa from the Mesozoic – Tertiary sediments of Petroliferous basins of India” includes stratigraphic ranges of palynotaxa; their botanical affinities; ecology; and paleoceanography. Forty-five detailed stratigraphic range tables are included, summarizing the large volume of palynological data. The volume has a concluding chapter dealing with evolution of angiosperms, plate tectonics, migration routes, provincialism and implications in exploration of hydrocarbons.
Published two atlases covering Mesozoic and Tertiary dinoflagellate cysts from Krishna-Godavari Basin. A maximum sequence stratigraphic resolution of 0.4 to 1 million year has been established for Krishna-Godavari and Mumbai Offshore basins. Also successfully reconstructed the paleogeography and paleoenvironmental models to understand relative sea level changes and develop sequence biostratigraphy. The work on source rock evaluation has helped in identifying depocentres for the development of petroleum source rocks. The above information is of immense value in refining existing geological models for reducing exploration risk.
The information disseminated will bring out remarkable changes in the field of high-resolution biostratigraphy to give lead in hydrocarbon exploration particularly the stratigraphic traps. The following 5 major publications will serve as a ready reckoner for instant use in interpretation to biostratigraphers and basin modelers for hydrocarbon exploration:
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| Mehrotra |
NC, Venkatachala BS, Swamy SN & Kapoor PN, 2002. Palynology in hydrocarbon exploration – the Indian Scenario – Geol. Society of India, Bangalore. Memoir No. 48, 2002, pp. 162, figs. 1–28, plates 1–20 |
| Mehrotra |
NC & Aswal HS, 2003. Atlas of Dinoflagellate Cysts from Mesozoic–Teritary Sediments of Krishna–Godavari Basin, Volume–I: Late Jurassic–Cretaceous Dinoflagellate Cysts; Paleonotographica Indica, KDMIPE, ONGC special publication, No. 7:145 p., 36 plates. |
| Mehrotra |
NC & Singh Kamla, 2003. Atlas of Dinoflagellate Cysts from Mesozoic–Teritary Sediments of Krishna–Godavari Basin, Volume–II: Tertiary Dinoflagellate Cysts; Paleonotographica Indica, KDMIPE, ONGC special publication, No. 8: 134 p., 36 plates. |
| Mehrotra |
NC, Venkatachala BS, & Kapoor PN, 2005. Palynology in Hydrocarbon Exploration, Part–II: Spatial and temporal distribution of significant spores/pollen and dinoflagellate cyst taxa from the Mesozoic–Tertiary sediments” – (Geological Society of India memoir No. 61, pp 1-128, 45 stratigraphic range charts). |
| Mehrotra |
NC, Singh BD, Kapoor PN & Garg Rahul 2008 (Editors). Proceedings Symposium on Palynology in Fossil Fuel Exploration. Geological Society of India Memoir, 71: 1-179. |
Initiated development of high impact palynological studies at BSIP, related to fossil fuel exploration and palaeoclimate. Thrust is given to multidisciplinary and multi-institutional integrated approach. First record of Type I matured liptinite organic matter from Late Neoproterozoic sediments is considered significant from hydrocarbon exploration. Establishing an Hydrocarbon Study Centre at BSIP for providing Consultancy Services to operators is in the process.
Recently established Polar Research Cell and initiated Glaciological Studies at BSIP to fully utilize integrated palaeobotanical data in understanding the past climatic changes especially during the last 10,000 years. Such studies on palaeoclimate would help in better understanding of present climatic changes and conceptualising future predictive models.
Dr. Mehrotra has to his credit some 53 research papers, published in National and International Journals including 2 monographs (Memoir Geol. Soc. 48 & 61), 2 volumes of atlas on fossil dinoflagellate cysts (ONGC Spl. Publs.) and one Edited Memoir Geol. Soc. 71. Additionally, about 100 Unpublished Technical Reports (ONGC).
He has following awards and honours to his credit: Awarded Government of India National Scholarship in Geology for post–Doctoral studies at the University of Saskatchewan, Saskatoon, Canada on "Phytoplankton in Oil Exploration" (1982); Birbal Sahni Birth Centenary Award, Indian Science Congress Association for life time achievements in the development of Palaeobotany(2007); S.N. Bhalla Gold Medal-2006, Palaeontological Society of India, Lucknow for outstanding life time contributions (2007); L.R. Rama Rao Centenary Award, Geological Society of India, Bangalore for Life Time contribution to Indian biostratigraphy and Palaeontology (2009); Palaeobotanical Society Diamond Jubilee Award, Palaeobotanical Society, Lucknow – Life time contribution for development of Palaeobotany (2009); President, Palaeobotanical Society, Lucknow; Member, Governing Body, Wadia Institute of Himalayan Geology, Dehradun, Department of Science & Technology, Govt. of India; National Centre for Antarctic & Ocean Research (NCAOR), Goa, Ministry of Earth Sciences, Govt. of India; Chairman, Research Advisory Council (Local), Regional Science Centre, Lucknow, Ministry of Culture, Govt. of India; Member Council and Fellow, Geological Society of India, Bangalore; ONGC honored with several Internal Awards for outstanding contributions in Biostratigraphy during 1987-2000. Provided useful Palynological backup data in hydrocarbon exploration in different prospective basins ; Organised Conferences / Symposium as Chairman – Six (2005-2009), including two international on Palaeobotany; two on Palynology / Micropalaeontology in Hydrocarbon Exploration; one on Polar Research; International Collaborations (Principal Investigator) with Brazil and China on Biostratigraphy / Palaeoclimate. |
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Some of his recent publications are:
| Some of his recent publications are: |
Publications: Sixty-one research papers including 2 monographs (Memoir Geol. Soc. 48 & 61), 2 volumes of atlas (ONGC Spl. Publs.) and one Edited Memoir Geol. Soc. 71. Additionally, about 100 Unpublished Technical Reports (ONGC) – important 15 listed.
| Major Publications (Books/Memoirs/Atlas) |
| Mehrotra NC, Venkatachala BS, Swamy SN & Kapoor PN, 2002. Palynology in hydrocarbon exploration – the Indian Scenario – Geol. Society of India, Bangalore. Memoir No. 48, 2002, pp. 162, figs. 1–28, plates 1–20 |
Mehrotra NC & Aswal HS, 2003. Atlas of Dinoflagellate Cysts from Mesozoic–Teritary Sediments of Krishna–Godavari Basin, Volume–I: Late Jurassic–Cretaceous Dinoflagellate Cysts; Paleonotographica Indica, KDMIPE, ONGC special publication, No. 7:145 p., 36 plates. |
Mehrotra NC & Singh Kamla, 2003. Atlas of Dinoflagellate Cysts from Mesozoic–Teritary Sediments of Krishna–Godavari Basin, Volume–II: Tertiary Dinoflagellate Cysts; Paleonotographica Indica, KDMIPE, ONGC special publication, No. 8: 134 p., 36 plates. |
Mehrotra NC, Venkatachala BS, & Kapoor PN, 2005. Palynology in Hydrocarbon Exploration, Part–II: Spatial and temporal distribution of significant spores/pollen and dinoflagellate cyst taxa from the Mesozoic–Tertiary sediments” – (Geological Society of India memoir No. 61, pp 1-128, 45 stratigraphic range charts). |
Mehrotra NC, Singh BD, Kapoor PN & Garg Rahul 2008 (Editors). Proceedings Symposium on Palynology in Fossil Fuel Exploration. Geological Society of India Memoir, 71: 1-179. |
| Research Papers Published in full in Standard Refereed Journals |
Singh RY & Mehrotra NC, 1977. Palynological evidence on the age of Mikir Formation, Curr. Sci. 46(4): 128-129. |
Mehrotra NC & Sinha AK, 1978. Discovery of Microplankton and the evidences of the younger age of Sangchamalla Formation (Upper Flysch) of Malajohar area in the Tethyan zone of Kumaun Himalaya. Him. Geol. 8(2): 1001-1004. |
Mehrotra NC, Pal D & Srivastava AK, 1979. Aspects and prospects of palynology in solving the Quaternary Geology Problems of Himalaya with special reference to the Karewa sediments of Kashmir Valley. Him. Geol. 9(1): 371-384. |
Mehrotra NC, 1980. Tertiary palynology of Himalaya – a review, Him. Geol. |
Mehrotra NC & Sinha AK, 1981. Further studies on microplankton from the Sangchamalla Formation (Upper Flysch) of Malla Johar area in the Tethyan zone of Higher Kumaun Himalaya. Contemporary Geosci. Res. Him. 1: 151-160. |
Mehrotra NC & Sah SCD, 1981. Mikir Formation of Mikir North. Cachar Hills, Assam – Its stratigraphic status, age and geological evolution of depositional basin. Bull. Ind. Geol. Assoc. 14(1): 1-13. |
Mehrotra NC, 1981. Palynostratigraphic correlation of Mikir Formation with Lower Paleogene sediments of Shillong Plateau. Geophytology 11(2): 133-142. |
Mehrotra NC, 1981. Fossil dinoflagellates from Garampani Limestone sediments of Garampani area in North Cachar Hills, Assam. Geosci. Jour. 2(1): 13-22. |
Mehrotra NC & Sah SCD, 1982. Palynostratigraphic correlation of Mikir Formation in the type area, Geosci. Jour. 3(2): 113-134. |
Mehrotra NC & Sharma J, 1982. Record of Aquilapollenites from Andaman Offshore well AN –1, Bulletin ONGC 19(2): 1-4. |
Mehrotra NC, 1983. Palynology of Mikir Formation in the type area. Geosci. Jour. 4(1): 1-34. |
Sharma J & Mehrotra NC, 1984. Discovery of Late Triassic sediments from Andaman Islands : Further palynological evidences. Bulletin ONGC 21(2): 69-73. |
Mehrotra NC & Rawat Ravi, 1992. Neogene dinoflagellate cysts from Bengal Basin, India. In, ‘Neogene and Quaternary dinoflagellate cysts and acritarchs’ (eds. Head and Wrenn); Special Publication; American Association of stratigraphic Palynologists Foundation, USA: 197-217. |
Mehrotra NC & Kapoor PN, 1999. Palynology in hydrocarbon exploration– advancements in Indian perspectives. Jour. Geol. Soc. India, 53: 637– 648. |
Aswal HS & Mehrotra NC, 1999. Late Jurassic – Cretaceous dinoflagellate cyst biochronostratigraphy of Krishna –Godavari Basin, India, Bulletin ONGC 36(2): 45 – 62. |
Raju DSN, Bhandari Anil, Mehrotra NC & Ali QA, 1999. Cretaceous and Cenozoic Biochronohorizons valuable for Indian basins – A preliminary table and notes, Bulletin ONGC 36(2): 97 – 103. |
Mehrotra NC, Swamy SN & Rawat RS, 2001. Reworked Carboniferous palynofossils from Panna Formation, Bombay Offshore : A clue for hidden exploration target Jour. Geol. Soc. India 57: 239–248. |
Mehrotra NC, Rawat RS, Juyal NP & Swamy SN, 2001. Palynostratigraphy and Paleoenvironment of Panna Formation, Bombay Offshore, Bulletin ONGC 38(2): 7–26. |
Aswal HS & Mehrotra NC, 2001. Mesozoic–Cenozoic Dinoflagellate Cyst Bio–chronostratigraphy of Krishna–Godavari Basin, India – A summary. Bulletin ONGC 38(2): 91–100. |
Singh Kamla & Mehrotra NC, 2001. Tertiary dinoflagellate cyst biochronostratigraphy of Krishna–Godavari Basin, India. Bulletin ONGC 38(2): 47–65. |
Singh Kamla, Aswal HS & Mehrotra NC, 2002. Palynostratigraphic Studies of Middle Eocene-Oligocene Sediments in Ichapur Area, West Bengal, India. Indian J. Petrol. Geol. 11(1): 57-64. |
Mehrotra NC, Aswal HS, Singh Kamla & Raju DSN 2008. High Resolution Biochronostratigraphy of Petroliferous Basins of India based on Dinoflagellate Cysts with supportive Spores-Pollen Data. Memoir Geol. Soc. India, No. 71: 45-65 |
Mehrotra NC, Babu R, Tewari R, Jha N, Kumar P, Singh VK and Shukla M 2008. New Global opportunities for Hydrocarbon Exploration in Neoproterozoic Basins of Indian Subcontinent. J. Geol. Soc. India, vol. 72, pp. 543-546. |
Misra, R., Mehrotra, N.C. and Shyam, R. 2007. Redefining Stratigraphy in Pranhita-Godavari, Gondwana Basin India: Palynological Substantiation. ONGC Bull. Spl Issue, KDMIPE, Dehradun, vol 42(2), pp1-15. |
Mehrotra, N. C., Venkatachala, B.S. and Kapoor, P.N. (2009). Palynology in Hydrocarbon Exploration : High Impact palynological studies in Western Offshore and Krishna Godavari Basin. J. Geol. Soc. India vol. 75, pp. 364-379. |
Tewari, Rajni, Mehrotra, N.C., Meena, K.L. and Pillai, S.S.K. (2009). Permian Megaspores from Kuraloi Area, Ib-River Coalfield, Mahanadi Basin, Orissa. J. Geol. Soc. India, vol. 74, pp. 669-678. |
Singh, Vartika, Farooqui, Anjum, Mehrotra, N.C., Ravindra, R., Singh, D., Tewari, Rajni, Jha, Neerja. and Kar, R. 2011. Late Pleistocene and Early Holocene climate of Ny-Aleusund Svalbard, Norway: A study based on biological proxies. J. Geol. Soc. India, vol. 78, pp. 109-116. |
Neerja Jha, Pauline Sabina K and Mehrotra N.C 2011. Early Triassic palynomorphs from Manuguru area of Godavari Graben, Andhra Pradesh, India , Jour. Geological Society of India, vol. 78, pp. 164-174. |
Madhav Kumar, Tewari Rajni, Chatterjee, S & Mehrotra N.C. 2011, Charcoalified plant remains from the Lashly Formation of Allan Hills, Antarctica: Evidences of forest fire during the Triassic Period, Episodes, Vol. 34, no. 2, pp. 109-118. |
| Research Papers Published in full in Standard Refereed Journals (with foreign collaborators) |
Mehrotra NC, & Sarjeant WAS, 1984a. The dinoflagellate cyst genus Polygonifera; emendation & taxonomic stabilization. J. Micropaleont, London, 30(1): 43-53. |
Mehrotra NC & Sarjeant WAS, 1984b. Archeopyle type in the dinoflagellate cyst genus Imbatodinium : some new observations. Micropaleontology 30(2): 213-222. |
Mehrotra NC & Sarjeant WAS, 1984c. Dinogodinium, a dinoflagellate cyst genus exhibiting variation in archeopyle character. Micropaleontology 20(3): 292-305. |
Mehrotra NC & Sarjeant WAS, 1986. Early to Middle Cretaceous dinoflagellate cysts from the Priyavadavadi shallow well–1, Cauvery Basin, India. Geobios.,19 (6):705-753. |
Mehrotra NC & Sarjeant WAS, 1987. Late Cretaceous to Early Tertiary dinoflagellate cysts from Narasapur well–1, Godavari–Krishna Basin, South India. Geobios. 29(2): 149-191. |
Mehrotra NC & Sarjeant WAS, 1990. Late Triassic Palynomorphs from the Andaman Islands : A reply to Kumar. Modern Geology, 14: 255–264. |
Mehrotra NC & Sarjeant WAS, 1999. Late Cretaceous to Early Tertiary dinoflagellates from Krishna–Godavari Basin – A cyst morphological and dating review, Palaeobotanist, 47: 50 – 59. |
Spicer, R.A., Bera, Subir, Bera, Sreelekha De, Spicer, Teresa E.V., Srivastava, Gaurav,Mehrotra, Rakesh, Mehrotra, Naresh & Yang, Jian, 2011. Why do foliar physiognomic climate estimates sometimes differ from those observed? Insights from taphonomic information loss and a CLAMP case study from the Ganges Delta. Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 302, pp. 381–395. |
| Research Papers Published in Conference / Symposium / Seminar volumes |
Mehrotra NC & Sah SCD, 1980. Taxonomic revision of some reticulate trilete spores and their significance in the stratigraphy of Mikir Formation. Proc. IV Int. Palynol. Conf., Lucknow (1976-77) 2: 649-662. |
Sah SCD & Mehrotra NC, 1988. Tertiary palynology of India. – A review. Three decades of Strat. & Palynol. In India. Geol. Survey India Spl. Publication. 11(2): 17–34. |
Mehrotra NC & Thakur RA, 1992. Dinoflagellate cysts from Bengal Basin. Proceedings Seminar on Geoscientific Studies in the Bay of Bengal and the Andaman Sea, Geol. Surv. India, Calcutta, 1990. Geol. Survey India, Spl. Pub. No. 20, 127– 132. |
Mehrotra NC & Thakur RA, 1991. Palynostratigraphic, Paleoclimatic and Paleoenvironmental studies of subsurface Gondwana sediments of Bengal Basin. In Proc. Conf. Integrated Expl. Res. Achievements and perspectives (eds. Pandey & Benerjee); KDM Inst. Petr. Expl., ONGC, Dehra Dun: 213-223. |
Mehrotra NC & Thakur RA, 1991. Dinoflagellate cyst assemblages from the subsurface of Bengal Basin. Proc. second seminar on Petroliferous Basins of India, KDMIPE, Dehra Dun: 83-92. |
Mehrotra NC, Berry CM & Nautiyal DD, 1995. Palynostratigraphy and source rock evaluation studies on Oligocene – Miocene subsurface sediments of Surat Depression. Proc. PETROTECH, New Delhi. Technology Trends in Petroleum Industry, 43 – 52. |
Nair PKK & Mehrotra NC, 1996. Application of pollen–spore morphology in paleoenvironmental studies and oil prospecting. Contrs. XV Indian Colloq. Micropal. Strat. Dehra Dun: 663 – 669. |
Berry CM, Mehrotra NC & Nautiyal DD, 1996. Hydroacarbon potential in the Gulf of Cambay – a palynological perspective. Contrs. XV Indian Colloq. Micropal. Strat., Dehra Dun: 707 – 710. |
Mehrotra NC, Nautiyal DD & Berry CM, 1996. Dinocyst biostratigraphy of payzones of the Gulf of Cambay. Contrs. XV Indian Colloq. Micropal. Strat., Dehra Dun: 683 – 694. |
Mehrotra NC, Saxena RK & Sharma J, 2000. Palynological interpretation of the Pre – Barail sediments in the Upper Assam Basin, India, Proceedings XVI ICMS, Goa, 1998. ONGC Bulletin, Spl. vol. 37(1): 145 – 156. |
Pundeer BS & Mehrotra NC, 2000. Palynology and depositional environment of Basal Sandstone, Upper Assam Shelf, Proceedings XVI ICMS, Goa, 1998. ONGC Bulletin, Spl. vol. 37(1): 139 – 144. |
Singh Kamla, Aswal HS & Mehrotra NC 2002. Sequence Biostratigraphy of Cenozoic Sediments in East Godavari Subbasin, Krishna-Godavari Basin, India. Proc. First APG Conf. & Exbn. Mussoorie: 479-487. |
| Short Research Papers |
Mehrotra NC, 2005. Advances in the study of Dinoflagellate Cysts and Spore-Pollen Stratigraphy in India. In – DSN Raju et al. (Editors) An overview of Litho-Bio-Chrono-Sequence Stratigraphy and Sea-Level Changes of Indian Sedimentary Basins. Assoc. Petrol. Geolos. Spl. Publ. 1: 129-130. |
Mehrotra NC, 2007. Industrial palynology and its relevance to Society. IGC Bull. 1: 110-112. |
| M.S. Swaminathan Festschrift volume |
Mehrotra, N.C. 2011. Development of Palynological Studies in Hydrocarbon Exploration in India – A review, Review Paper - M.S. Swaminathan Festschrift volume of the Journal of Palynology, pp. 299-314. |
| Invited Lecture |
Mehrotra, N.C. 2011. High impact Palynology in Hydrocarbon Exploration in Petroliferous Basins of India with recent achievements from Frontier Areas. Fifteenth IGC Foundation Lecture, Banaras Hindu University, Varanasi, August 11, 2011, pp. 43. (To be published soon in – Journal Indian Geological Congress) |
| Research papers in Press |
Tewari Rajni & Mehrotra, Naresh. C. Dispersed fossil plant cuticles from North-East India: Implications in Palaeclimatic interpretations. J. Geol. Soc. India. |
Tewari Rajni & Naresh. C. Mehrotra. Gymnospermous seeds from Early Permian Sequence of Umrer Coalfield, Wardha Basin, Maharashtra. J. Geol. Soc. India. |
Naresh C. Mehrotra, Rajni Tewari, Mitsuro Arai, Maria Judite Garcia and Mary E.C Bernardes-de-Oliveira. Stratigraphic ranges of dinoflagellate cysts from Cretaceous Petroliferous basins of India and Brazil, Palaeobotanist. |
| Research papers Submitted |
Tewari, R. and Mehrotra, N.C. (under review). Dispersed fossil plant cuticles from North-east India: Implications on Palaeoclimatic interpretation. J. Geol. Soc. India |
Tewari, R., Chatterjee, S., Kumar, M., Kar, R. and Mehrotra, N. C. Triassic forest fire in Antarctica: Evidence from floral and sedimentary organic matter in Lashly Formation of Allan Hills, South Victoria Land J. Biosci., Bangalore. |
| Important Technical Reports of ONGC (Unpublished) |
Singh Pratap, Mehrotra NC, Singh DN, Sharma J & Porwal DK, 1986. Paleogene–Neogene Biostratigraphy of Andaman–Nicobar Islands and its relationship with Sumatran Arc to the South east. Parts I and II, pp. 1–240, plates 60 & figs. 60. KDMIPE, ONGC, unpublished report. |
Mehrotra NC & Nautiyal DD, 1995. Dinoflagellate cyst studies in the Oligocene –Miocene sands of Surat Depression with reference to finer biozonation cataloguing of significant taxa and paleoenviornmental aspects. pp. 1–18. KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Rawat RS, Juyal NP, Sharma J & Swamy SN, 1997. Palynostratigraphy and paleoenvironment of Basal Clastic sediments of Panna Formation of Bombay Offshore, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Singh Kamla & Aswal HS, 1998. Dinoflagellate cyst biostratigraphy of Mesozoic–Tertiary sequence of Krishna–Godavari Basin and its correlation and calibration with foraminiferal biostratigraphy and calcareous nannoplankton chronostratigraphy, pp. 43, figs. 35 & tables 3. KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Juyal NP, Rawat RS, Saxena RK & Swamy SN, 1998. Palynostratigraphy, paleoenvironment and source rock palynology of sediments from Wedge out prospects, KDMIPE, ONGC unpublished report. |
Mehrotra NC, Aswal HS & Asher R, 1999. Part I : Biostratigraphic sequence stratigraphy of Cretaceous sediments of East Godavari subbasin, K.G. Basin and storage of dinocyst data. Part II : Atlas of Late Jurassic–Cretaceous dinoflagellate cysts of Kirshna–Godavari Basin, pp. 136, plates20, figs. 41. KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Singh Kamla & Asher R, 1999. Part I : Biostratigraphic sequence stratigraphy of Oligocene–Miocene sediments of K.G. Basin and storage of dinoflagellate data. Part II : Atlas of Tertiary dinoflagellate cysts of Kirshna–Godavari Basin, pp. 119, plates 23, figs 25. KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Swamy SN, Rawat RS, Kapoor PN & Shyam Radhey, 2000. Dinoflagellate cyst biozonation across paleogene sediments in Bombay Offshore and development of source rock, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Swamy SN, Rawat RS, Kapoor PN & Shyam Radhey, 2001. Dinoflagellate cyst biozonation across paleogene sediments in Bombay Offshore and development of source rock, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Swamy SN, Rawat RS, Kapoor PN & Shyam Radhey, 2002. Dinoflagellate cyst biozonation across paleogene sediments in Bombay Offshore and development of source rock, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Swamy SN, Kapoor PN & Shyam Radhey, 2003. Microfacies analysis, diagenetic history and biostratigraphy of Panna, Bassein & Mukta formations in Central Graben Area East of B#55 & Panna Structure, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Swamy SN, Kapoor PN & Shyam Radhey, 2003. Multimicrofossil Biostratigraphy, Paleoenvironmental Analysis and Source Rock Evaluation of Sediments in Bassein East, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Rawat RS, Kapoor PN, Chakraborty AK, Uppal S, Shyam Radhey & Saxena KK, 2004. Microfacies, Diagenesis, Biostratigraphy and Source Rock Potential of Paleogene and Neogene Sediments of B–163/ 66/HEM Area, KDMIPE, ONGC, unpublished report. |
Mehrotra NC, Sharma DC, Rawat RS, Kapoor PN, Singh SD, Sinha AK, Begam Jorida Baruah, Joyshree Shyam Radhey & Saxena KK, 2004. Multimicrofossil Biostratigraphy, Paleoenvironmental analysis and Source Rock Evaluation of Panna, Bassein, Mukta, Heera and Bombay Formations in Bassein East, KDMIPE, ONGC, unpublished report. |
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