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Sharma, V.
- Late Miocene Planktonic Foraminifera of Interview Island, Bay of Bengal
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Authors
V. Sharma
1,
Ravindra Kumar
1
Affiliations
1 Department of Geology, University of Delhi, IN
1 Department of Geology, University of Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 6 (1986), Pagination: 508-511Abstract
A sequence of clayey to sandy limestone exposed on the eastern coast of Interview Island, Bay of Bengal is studied for foraminiferal content. Twenty-seven species of planktonic foraminifera are reported. The species assemblage consisting of Globorotalia plesiotumida, Globigerinoides extremus, Neogloboquadrina acostaensis and Globorotalia (Tenuitella) anfracta suggests a Late Miocene age for the limestone unit. The assemblage is referable to Zone 17 of Blow (1969) and Zone 17A of Srinivasan and Kennett (1983) and represents the Neillian Stage (Srinivasan, 1978).
- Late Miocene to Early Pliocene Radiolarian Biostratigraphy of Neill Island, Andaman Sea
Abstract Views :189 |
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Authors
V. Sharma
1,
G. K. Sharma
1
Affiliations
1 Deparment of Geology, University of Delhi, IN
1 Deparment of Geology, University of Delhi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 1 (1989), Pagination: 76-82Abstract
104 species of radiolaria are recorded from a Late Miocene-Early Pliocene sequence exposed at Neill Island. The assemblage shows presence of a few reworked radiolarian species. The radiolarian zones proposed for low latitude areas are applicable in the present study. Two zones, viz., Didymocyrtis penultima Zone and Stichocorys peregrilla Zone, have been recognized in the sequence. Based on the study of pianktonic foraminifera of the same sequence by earlier workers, an integrated scheme of radiolarian and foraminiferal zones is presented.Keywords
en- Radiolarian Occurrences in Surface Sediments of the Indian Ocean in Relation to Bottom Water Circulation
Abstract Views :179 |
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Authors
V. Sharma
1,
A. K. Mahapatra
1
Affiliations
1 Department of Geology, University of Delhi, Delhi 110007, IN
1 Department of Geology, University of Delhi, Delhi 110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 3 (1990), Pagination: 251-261Abstract
Occurrences of radiolaria in the surface sediments collected at 22 stations in the Indian Ocean are noted. While some samples contain abundant radiolaria, others show extremely poor concentration, or, are practically devoid of them. A distinct relationship is found between radiolarian abundance and deep water current systems. It is suggested that the occurrence of radiolaria is largely controlled by currents which are responsible for dissolving radiolarian skeletons. The assemblage is dominated by warm-water species and also contains a few cold-water forms. The cold-water species are believed to be transported by the Antarctic Bottom Waters (AABW) to the present area.Keywords
Marine Geology, Indian Ocean, Palaeontology (Invertebrate).- Late Miocene (N eillian) Planktonic Foraminifera from Baratang Island, Andaman Sea
Abstract Views :175 |
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110007, IN
1 Department of Geology, University of Delhi, Delhi 110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 37, No 5 (1991), Pagination: 482-491Abstract
Neogene sequences exposed on the southwestern part of the Baratang Island have been assigned Early to Middle Miocene (?) and Late Miocene age. Biostratigraphically, the Late Miocene sequence is referable to Globorotalia (Globorotalia) plesiotumida Zone. A predominantly warm-water assemblage of planktonic foraminifera contains some cold-water species. Presence of these cold-water forms is linked with the Late Miocene climatic cooling.Keywords
Miocene Foraminifera, Baratang Island, Biostratigraphy, Neogene.- Lithofacies Analysis, Benthic Foraminifera and Depositional Environments of the Chhasra Member: A Transgressive Tide and Storm Affected Early Miocene Sequence in Kachchh, India
Abstract Views :188 |
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 2 (1991), Pagination: 119-149Abstract
A 40m thick Early Miocene sequence occurring near Naliya has been investigated for its sedimentary facies and benthic foraminiferal biofacies. The changing depositional environments of the sequence have been interpreted to represent (a) supratidal to (b) supratidal-intertidal and (c) subtidal (limited clastic influx) to ultimately subtidal (increased clastic influx) palaeoenvironments. The lowest part of the section shows evidence of emergence which together with benthic foraminiferal population dominated by Pararotalia nipponica - Loxostomwn lobatwn (water depths of 05-10m) suggests a supratidal environment.
The middle part of the stratigraphic interval has been subdivided into a lower and upper part on the basis of an intervening calcrete (calcretised shell limestone) horizon. The lower part of this interval represents lagoonal and high intertidal environments.
The upper part of this interval shows development of cross bedded and wave-rippled sandstones representing beach ridge-tidal inlet sequence. Other lithofacies include shell layers having predominance of one kind of organism. Some of these shell banks are wave sorted. Biofacies II -Hanzawaia nipponica - Cibicides lobatulus characterises this part of the section and indicates water depths of - 5Om.
The upper part of the sequence is composed of silt which contains Ammonia beccarii -Pseudorotalia gaimardi in abundance. This interval is frequently interspersed by oyster-Pecten beds and indicates subtidal environment with increased influx of siliciclastics.
The changing depositional environments show that these Early Miocene rocks represent a transgressive, tide-dominated, storm affected sequence.
Keywords
Lithofacies Analysis, Foraminifera, Chhasra Member, Kachchh, Gujarat, Early Miocene Sequence.- Radiolarian Biostratigraphy of Early Pliocene Sequences, Car Nicobar Island, Northeast Indian Ocean
Abstract Views :172 |
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Authors
V. Sharma
1,
Surender Singh
1
Affiliations
1 Department of Geology, University of Delhi, Delhi-110007, IN
1 Department of Geology, University of Delhi, Delhi-110007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 3 (1993), Pagination: 199-213Abstract
A study of the radiolarian assemblage from the Sawai Bay Formation (Early Pliocene) exposed in Car Nicobar bland shows the presence of age diagnostic radiolarian taxa. Based on the radiolarian zonation applicable for the tropical Indian Ocean, three radiolarian zones are identified in this formation. These, in ascending order, are: Phormostichoartus doliolum zone, P. fistula zone and Stichocorys peregrina Zone. The radiolarian events (first and last appearances) recognised in the Car Nicobar sequences are discussed in relation to those in the Central Indian Ocean Basin. The proposed radiolarian zones are correlated with the previously proposed planktonic foraminiferal zone in the study area, and an htegrated biostratigraphic scheme is presented.Keywords
Car Nicobar, Pliocene, Radiolarian Zonation, Micropaleontology, Northeast Indian Ocean.- Cretaceous and Middle Eocene Radiolaria from Ejected Sediments of mud Volcanoes of Baratang Island in Andaman Sea of the Northeastern Indian Ocean
Abstract Views :168 |
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Authors
Affiliations
1 Department of Geology, Northern Illinois University, DeKalb, Illinois 601 15, US
2 Department of Geology, University of Delhi, Delhi-110 007, IN
1 Department of Geology, Northern Illinois University, DeKalb, Illinois 601 15, US
2 Department of Geology, University of Delhi, Delhi-110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 4 (1995), Pagination: 463-469Abstract
Radiolarians from seven samples of ejected sediments of mud volcanoes of Baratang Island in the Andaman Sea provide additional evidence for the presence of Cretaceousand MiddIe Eocene strata beneath the island. A general NNE-SSW alignment of the mud volcanoes suggests the structural control for their occurrence due to regional tectonics.Keywords
Radiolaria, Mud Volcanoes, Cretaceous, Eocene, Andaman Sea, Indian Ocean- Early Miocene Radiolarian and Planktonic Foraminiferal Biostratigraphy, North Passage Island, Andaman Sea
Abstract Views :171 |
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Department of Geology, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
2 Department of Geology, Banaras Hindu University, Varanasi 221 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 2 (1993), Pagination: 154-162Abstract
The Early Miocene sequences of North Passage Island iu the Andaman Sea have been studied for their siliceous and calcareous microfossil assemblages. 95 species of radiolaria and 27 species of planktonic foraminifera belonging to these two major groups of microfossils have been documented. An integrated radiolarian ancl planktonic foraminifera1 biostratigraphy is presented.Keywords
Radiolaria, Planktonic Foraminifera, Biostratigraphy, Micropaleontology, Early Miocene, Andaman-Nicobar Islands.- Stratigraphy and Microfauna of Car Nicobar Island Bay of Bengal
Abstract Views :187 |
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Authors
Affiliations
1 Department of Geology, Banaras Hindu University, Varanasi, IN
1 Department of Geology, Banaras Hindu University, Varanasi, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 14, No 1 (1973), Pagination: 1-11Abstract
The paper gives a complete stratigraphic sequence of Car Nicobar strata for the first time since the work of Schwager. The Sawai Bay formation (consisting of a mudstone member and a limestone member) and the Malacca limestone formation belonging to Archipelago Group are proposed with their type localities defined at Car Nicobar island. Based on the known stratigraphic ranges of planktonic foraminifera, the following three zones are distinguished in ascending order: (1) Globorotalia tumida flexuosa zone, (2) Globigerina nepenthes zone, and (3) Globorotalia multicamerata-Pulleniatina obliqueloculata (s.s.) zone. An Early to Middle Pliocene age is assigned to Schwager's Car Nicobar foraminifera based on planktonic foraminiferal evidence. A comparison of the zonation of Car Nicobar island with zones proposed by Banner and Blow shows that Banner and Blows' sequence is most applicable, and is used in the present work as a basis for comparison.- Miocene Palynoflora from Inglis Island, Andaman Sea and its Palaeoecological Implication
Abstract Views :196 |
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Authors
Affiliations
1 Department of Geology, Teacher Training University, No-49 Mofatteh Ave, Tehran, IR
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
3 Department of Geology, University of Delhi, Delhi -110 007, IN
1 Department of Geology, Teacher Training University, No-49 Mofatteh Ave, Tehran, IR
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
3 Department of Geology, University of Delhi, Delhi -110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 1 (2007), Pagination: 147-157Abstract
A nch palynofloral assemblage has been recorded for the first time from a stratigraphc section of the Inglis Formation at Inglis Island, Andarnan Sea, India Forty-six genera and fifty eight species belonging to differen botanical groups viz , dinoflagellate cysts, fungal remains, ptendophytic spores, and gymnospermous and angiospermous pollen have been recognized Geological ranges of some stratigraphically important palynotaxa suggest late Early Mioceneearly Middle Miocene age to the assemblage The recorded palynofloral assemblage is also closely comparable to that recorded horn late Early Miocene-Early Middle Miocene sediments of South Indla The palynoflora has been compared with the modem equivalents and it indicates a warm humid climate with high degree of rainfall during the deposition of the sequence In the area of investigation.Keywords
Palynoflora, Late Early Miocene-Early Middle Miocene, Palaeoecology, Inglis Island, Andaman Sea- Miocene Radiolaria from Inglis Island, Andaman Sea
Abstract Views :189 |
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 939-949Abstract
Two radiolanan assemblages are distinguished in the Calocydetta (C) costata Zone of Early to Middle Miocene from a stratigraphic section of Inghs Island, Andaman Sea Fluctuations in percent abundance of cooler and warmer water taxa in the section indicate changing water mass conditions Water mass fluctuations in the form of cooling and warming of surface water have also been identified in the same stratigraphic interval from various tropical Indian Ocean DSDP and ODP sites by other investigators using oxygen isotope data.Keywords
Radiolana, Miocene, Andaman Sea, Inghs Island, Andaman-Nicobar.- Miocene Radiolaria from Nicholson and John Lawrence Islands, Andaman Sea
Abstract Views :176 |
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Authors
V. Sharma
1,
J. Daneshian
1
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 52, No 6 (1998), Pagination: 695-707Abstract
One hundred and thirty three radiolarian taxa from two sections, one each at Nicholson Island and John Lawrence Island, Andaman Sea are reported. The assemblage is referable to upper Calocycletta costata Zone to lower Dorcadospyris alata Zone (late Early Miocene to early Middle Miocene, about 16.9 Ma to 15.9 Ma). Stratigraphic ranges of some selected species are compared with those in the deep sea drilling sites in the tropical Indian Ocean.Keywords
Radiolaria, Micropaleontology, Miocene, Andaman-Nicobar Islands, Indian Ocean.- Early Neogene Radiolarian Faunal Turnover in the Northern Indian Ocean: Evidence from Andaman-Nicobar
Abstract Views :186 |
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 Department of Geology, Teachers' Training University of Tehran, Tehran, IR
1 Department of Geology, University of Delhi, Delhi - 110 007, IN
2 Department of Geology, Teachers' Training University of Tehran, Tehran, IR
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 2 (2011), Pagination: 157-166Abstract
Two intervals of faunal turnover are revealed by the study of radiolarians from the Early to Middle Miocene sequence of Andaman-Nicobar belonging to Stichocorys wolffii-Calocycletta costata -Dorcadospyris alata zones. These faunal changes are reflected in the values of species diversity, change in abundance of taxa, origination and extinction events and change in radiolarian assemblages. One such faunal change is identified in the latest Early Miocene. The time of this faunal change is marked by the extinction of species like Carpocanopsis cingulata and appearance of Calocycletta costata, Giraffospyris toxaria, Acrocubus octopylus and Liriospyris parkerae, an increasing trend in percentage of cold water species and a decreasing trend in species diversity upwards. The interval coincides with the time of initiation of cooling of sea surface water. Another, and the most prominent faunal turnover of radiolarians is recognized in the Middle Miocene Dorcadospyris alata Zone at about 14.8-12.7 Ma and is characterized by almost complete disappearance of an earlier dominant assemblage and an increase in abundance of an assemblage that was practically absent in the older sequence. The time of this turnover can be correlated with the time of Middle Miocene cooling identified in the examined sequence.Keywords
Faunal Turnover, Miocene, Early Neogene, Radiolarians, Indian Ocean, Andaman-Nicobar.References
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