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

D. S. N. Raju ¹

Affiliations
1 Palaeontology Laboratory, Oil & Natural Gas Commission, Madras, IN

Abstract

No Abstract.

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D. S. N. Raju ¹, B. C. Jaiprakash ¹, C. N. Ravindran ², R. Kalyansunder ², P. Ramesh ²

Affiliations
1 Palaeontology Lab., KDMIPE, ONGC, Dehra Dun-248195, IN
2 Regional Geology Lab., ONGC. No.3, First Lane, Nungambakkam High Road Madras 600034, IN

Abstract

A Major hiatus of varying time span ofiess than 1 Ma to greater than 30Ma encompasses the Cretaceous/Tertiary boundary (KTB) in several parts of the Cauvery, Krishna-Godavari (KG) and other pericratonic basins of India. The succession in the north and northeastern parts of Cauvery basin is apparently continuous, whereas in other areas of this basin, either the sediments of Late Maastrichtian or Middle-Late Maastrichtian or even Middle Campanian-Maastrichtian are unrepresented due to erosion/nondeposition. A north-northeasterly tilt within the Cauvery basin with some tectonic blocks subsiding is inferred during Late Maastrichtian. An additional event of global significance that occured across orvery close to the KTB in KG basin is volcanism within alimited duration of 3.8 to 5.5 Ma equivalent to Deccan volcanism. The succeeding transgression in Paleocene-Early Eocene was in pulses at levels ranging from Zone PI-P7. This hiatus appears to be linked with the rise of a giant hot mantle plume just prior to the eruption of Deccan volcanism during Abathompalus mayaroensis Zone of Latest Maastrichtian around 66.5Ma to 67.5Ma.

Keywords

Stratigraphy, K/T Boundary, Cauvery Basin, Krishna-Godavari Basin.

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B. C. Jaiprakash ¹, D. S. N. Raju ¹

Affiliations
1 Palaeontology Laboratory, KDM Institute of Petroleum Exploration, ONGC, Dehra Dun 248 195, IN

Abstract

Uvigerina danvillensis Howe and Wallace and Hantkenina trinididecrsis Bronnimann are described and illustrated from Late Eocene succession of Cambay basin. The presence of these two species at two levels indicates possible incursions of moderately deep marine conditions in an inner shelf set-up.

Keywords

Foraminifera, Micropaleontology, Cambay Basin, Gujarat, Eocene.

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D. S. N. Raju ¹, B. C. Jaiprakash ¹, Arun Kumar ¹, R. K. Saxena ¹, Alok Dave ¹, T. K. Chatterjee ¹, C. M. Mishra ¹

Affiliations
1 Geological Laboratories, KDM Institute of Petroleum Exploration, ONGC, Kaulagarh Road, Dehra Dun - 248195, IN

Abstract

The latest Paleontological data suggest that the duration of Deccan trap eruption in Krishna-Godavari basin varies from place to place and could be anywhere between <0.5 Ma and 6 Maacross KTB. Three groups of fossils viz., Planktic foraminifera, Nannoplanktics and Dinoflagellate cysts suggest that the initiation of volcanism was during latest Maastrichtian within the upper part of Abathomphalus mayaroensis Zone, Micula murus Zone and Triblastula utinensis Zone between 67 and 66.5 Ma. There are conflicting evidences in dating the upper age limit of the volcanics probably due to diverse methods employed in calibration of forarniniferal and nannoplanktic scales or selective retrieval of very small sized planktics of zones P0 and P1 in well cuttings.

Keywords

Micropalaeotogy, Deccan Volcanism, Age, Krishna-Godawari Basin.

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B. C. Jaiprakash ¹, Jagmohan Singh ¹, D. S. N. Raju ¹

Affiliations
1 KDM Institute of Petroleum Exploration, Oil & Natural Gas Commission, Dehradun - 248 195, IN

Abstract

Temporal distribution of planktonic and benthonic foraminifera across the K/T boundary in the Palakollu deep well section of Krishna-Godavari (KG) Basin, India, suggests that the lower Deccan trap flows have erupted during Zone M-18 of the latest Maastrichtian (66.5-65.5 m.y.) to Danian and the upper flows in lower Zone P₂ of the Early Paleocene (6 1.2-60.7 m.y.). The span of volcanism will be approximately 6 m.y.

Keywords

Cretaceous/Tertiary Boundary, Deccan Voicanism, Age, Krishna-Godavari Basin, Andra Pradesh.

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D. S. N. Raju ¹

Affiliations
1 Palaeontology Laboratory, KDMIPE, ONGC, Kaulagarh Road, Dehrudun 248195, IN

Abstract

The Kutch stages of Biswas, 1965 and the Andaman-Nicobar stages of Srinivasan, 1978 are correlated following a reasonable tie-up of ranges of the Miogypsinidae and planktonic scale.

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Kapesa Lokho ¹, D. S. N. Raju ²

Affiliations
1 Wadia Institute of Himalayan Geology, 33- GMS Road, Dehradun- 248001, IN
2 10 Siddharth Enclave, GMS Road, Dehradun- 248001, IN

Abstract

A small but varied assemblage of planktonic and benthic foraminifers comprising at least six genera and seven species is documented from the Upper Bhubhan Formation exposed at Thuampui in Aizawl District of Mizoram (NE India). The fossils from Thuampui are generally poorly preserved and some are even deformed, nevertheless they are important for determination of age and paleobathymetry. Based on this foraminiferal assemblage an early Middle Miocene age equivalent to planktonic foraminiferal zones N8-N9 and a paleobathymetry of 50 m is suggested for the fossiliferous Upper Bhubhan Formation at Thuampui of Mizoram.

Keywords

Bhubhan Formation, Early Middle Miocene, Foraminifera, Mizoram.

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Kapesa Lokho ¹, D. S. N. Raju ², R. J. Azmi ¹

Affiliations
1 Wadia Institute of Himalayan Geology, 33 GMS Road, Dehra Dun - 248 001, IN
2 MSR Residency, Pragathi Marg, JN Road, Rajahmundry - 53 3103, IN

Abstract

Planktic and benthic foraminifera including uvigerinids are documented from the Upper Bhuban Formation, exposed at Thingdawl village, Kolasib district, Mizoram. The foraminiferal assemblage is poorly preserved and consists of index fossils useful for precise biochronology and interpretation of the depositional environment. A total of ten benthic and six planktic foraminiferal species are described. Six species belong to the genus Uvigerina, four to Ammonia, one species each of Globorotalia, Globigerinoides, Clavatorella, Praeorbulina and two species of the genus Orbulina. Based on lithological and foraminiferal assemblage, middle neritic to upper part of outer neritic paleobathymetry is inferred for the deposition of this part of the Upper Bhuban Formation. The foraminiferal assemblage suggests late Early Miocene to early Middle Miocene, (∼16 Ma) equivalent to planktic foraminiferal zones N8-N9 for the Upper Bhuban Formation.

Keywords

Bhuban Formation, Miocene, Uvigerinids, Foraminifera, Assam-Arakan Basin, Mizoram.

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