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Reddy, A. N.
- Living and Dead Foraminiferida in the Araniar River Estuary, Chingleput District, Tamil Nadu State
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Authors
Affiliations
1 Department of Geology, S. V. University College, Tirupati-517 502, IN
2 Department of Geology, Sri Venkateswara University Postgraduate Extension Centre, Cuddapah-516004, IN
1 Department of Geology, S. V. University College, Tirupati-517 502, IN
2 Department of Geology, Sri Venkateswara University Postgraduate Extension Centre, Cuddapah-516004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 2 (1983), Pagination: 106-110Abstract
The living and dead foraminiferida in the substrate samples collected from 14 Stations in the Araniar River estuary along the east coast of India from June 1978 to May 1979 have been studied quantitatively. The average salinity ranges from 23.5 to 38.5% and it is considered to be the principal controlling ecologic factor that limits the distribution and abundance of foraminiferida. The pattern of distribution of foraminiferida is also explained in terms of deposition of fluviatile sediments in the estuary. The abundance and living/dead ratios of foraminiferida tests have been compared with those recorded in the nearby Dugarazupatnam and Pennar estuaries.
- Cluster Analysis and Distribution of Recent Foraminifera, Araniar River Estuary, Tamil Nadu, India
Abstract Views :175 |
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Authors
A. N. Reddy
1,
K. R. Reddy
2
Affiliations
1 Oil and Natural Gas Commission, Sibsagar 785640, IN
2 Department of Geology, S V University College, Tirupati 517502, IN
1 Oil and Natural Gas Commission, Sibsagar 785640, IN
2 Department of Geology, S V University College, Tirupati 517502, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 1 (1989), Pagination: 76-81Abstract
Both living and dead Foraminifera were collected from 15 sampling stations in the Araniar river estuary, along the east coast of India for a period of one year. The distribution of the species has been studied with respect to time and space. Based on the Q-mode cluster analysis of the foraminifera, three major biotopes have been recognised, one of which has been subdivided into three sub-biotopes, based on the change in the level of correlation.- Trace Fossils in Cores of Kopili, Barail and Tipam Sediments of Upper Assam Shelf
Abstract Views :189 |
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Authors
Affiliations
1 Regional Geological Laboratories, ONGC, Madras 34, IN
2 Cauvery Project, ONGC, Madras 86, IN
3 Regional Geological Laboratory, ONGC, Sibsagar 785640, IN
4 K. G. Project, ONGC, Rajahmundry 533103, IN
1 Regional Geological Laboratories, ONGC, Madras 34, IN
2 Cauvery Project, ONGC, Madras 86, IN
3 Regional Geological Laboratory, ONGC, Sibsagar 785640, IN
4 K. G. Project, ONGC, Rajahmundry 533103, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 3 (1992), Pagination: 253-257Abstract
A survey of trace fossi1s in cores of Kopili. Barail and Tipam (TS-5 member) sequences from Upper Assam Shelf reveals that the burrow types occurring in the sediments, produced by suspension and deposit feeding animals, includes Skolithos, Thalassinoides, Planolites and ?Muensteria. These ichnogenera indicate Skolithos ichnofacies and suggest that cores of Kopili and Barail sequences represent deposits of moderate to high energy marine conditions.Keywords
Trace Fossils, Tipam Sediments, Assam Shelf.- A Note on the Occurrence of Elphidium norvangi from Southeast Coast of India
Abstract Views :184 |
PDF Views:118
Authors
Affiliations
1 Department of Geology, S. V University, Tirupati, IN
2 Oil & Natural Gas Commission, Madras, IN
1 Department of Geology, S. V University, Tirupati, IN
2 Oil & Natural Gas Commission, Madras, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 1 (1994), Pagination: 95-96Abstract
No Abstract.Full Text
- Bathymetric Significance of the Ichnofossil Assemblages of the Kulakkalnattam Sandstone, Ariyalur Area, Cauvery Basin
Abstract Views :172 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, Anna University, Chennai - 600 025, IN
2 Department of Geology, M.S. University, Vadodara - 390 002, IN
3 Oil and Natural Corporation Ltd, Chennai - 600 049, IN
1 Department of Geology, Anna University, Chennai - 600 025, IN
2 Department of Geology, M.S. University, Vadodara - 390 002, IN
3 Oil and Natural Corporation Ltd, Chennai - 600 049, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 5 (2010), Pagination: 525-532Abstract
Well preserved ichnofossils were found in Kulakkalnattam sandstone exposed at Kulakkalnattam stream in Ariyalur area, Cauvery Basin. It consists of infaunal structures of both suspension and deposit feeders. Five ichnofossils are present in a fine to coarse grain sandstone which includes Ophiomorpha, Palaeophycus, Planolites Skolithos, and Thalassinoides. The study infers that ichnofossils Skolithos and Ophiomorpha are infaunal colonization of the suspension feeders in high energy condition in shifting substrate, whereas Thalassinoides and Planolites-Palaeophycus ichnofossils indicate infaunal deposit feeders living at the sediment-sediment interface in low to moderate energy conditions. Furthermore, the abundance and diversity of the trace fossils indicates there was alternatively fluctuations in energy conditions which lead to development of Skolithos and Cruziana ichnofacies type condition during the deposition of Kulkkallanattam sandstone in foreshore-shoreface environments.Keywords
Ichnofossils, Kulakkalnattam Sandstone, Ariyalur Area, Cauvery Basin.- How to Save Millions Thru Repair and Maintenance Welding Technique
Abstract Views :220 |
PDF Views:6
Authors
Affiliations
1 Ador Fontech Ltd., Bangalore, IN
1 Ador Fontech Ltd., Bangalore, IN
Source
Indian Welding Journal, Vol 49, No 2 (2016), Pagination: 43-47Abstract
The world has limited deposits of mineral resources. However, the depletion rate is resulting from increase in population, growth and development of industries, and consumption of raw materials that is on the rise. The consumption of new materials can be reduced by increasing the working life of components by recommending and implementing value added solutions. This will add further in reducing inventories, machinery down time and inventory costs. Therefore, reclamation and re-cycling of vital machinery components assumes high priority.- Deccan Volcanism Linked to the Cretaceous-Tertiary Boundary Mass Extinction: New Evidence from ONGC Wells in the Krishna-Godavari Basin
Abstract Views :191 |
PDF Views:1
Authors
G. Keller
1,
P. K. Bhowmick
2,
H. Upadhyay
2,
A. Dave
2,
A. N. Reddy
3,
B. C. Jaiprakash
3,
T. Adatte
4
Affiliations
1 Geosciences Department, Princeton University, Princeton, NJ 08544, US
2 Keshava Dev Malaviya Institute of Petroleum Exploration, Oil and Natural Gas Corporation, Dehradun, IN
3 Oil and Natural Gas Corporation, Regional Geoscience Laboratory, Chennai, IN
4 Geological and Paleontological Institute, Anthropole, CH-1015 Lausanne, CH
1 Geosciences Department, Princeton University, Princeton, NJ 08544, US
2 Keshava Dev Malaviya Institute of Petroleum Exploration, Oil and Natural Gas Corporation, Dehradun, IN
3 Oil and Natural Gas Corporation, Regional Geoscience Laboratory, Chennai, IN
4 Geological and Paleontological Institute, Anthropole, CH-1015 Lausanne, CH
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 5 (2011), Pagination: 399-428Abstract
A scientific challenge is to assess the role of Deccan volcanism in the Cretaceous-Tertiary boundary (KTB) mass extinction. Here we report on the stratigraphy and biologic effects of Deccan volcanism in eleven deep wells from the Krishna-Godavari (K-G) Basin, Andhra Pradesh, India. In these wells, two phases of Deccan volcanism record the world's largest and longest lava mega-flows interbedded in marine sediments in the K-G Basin about 1500 km from the main Deccan volcanic province. The main phase-2 eruptions (∼80% of total Deccan Traps) began in C29r and ended at or near the KTB, an interval that spans planktic foraminiferal zones CF1-CF2 and most of the nannofossil Micula prinsii zone, and is correlative with the rapid global warming and subsequent cooling near the end of the Maastrichtian. The mass extinction began in phase-2 preceding the first of four mega-flows. Planktic foraminifera suffered a 50% drop in species richness. Survivors suffered another 50% drop after the first mega-flow, leaving just 7 to 8 survivor species. No recovery occurred between the next three mega-flows and the mass extinction was complete with the last phase-2 megaflow at the KTB. The mass extinction was likely the consequence of rapid and massive volcanic CO2 and SO2 gas emissions, leading to high continental weathering rates, global warming, cooling, acid rains, ocean acidification and a carbon crisis in the marine environment.
Deccan volcanism phase-3 began in the early Danian near the C29R/C29n boundary correlative with the planktic foraminiferal zone P1a/P1b boundary and accounts for ∼14% of the total volume of Deccan eruptions, including four of Earth's longest and largest mega-flows. No major faunal changes are observed in the intertrappeans of zone P1b, which suggests that environmental conditions remained tolerable, volcanic eruptions were less intense and/or separated by longer time intervals thus preventing runaway effects. Alternatively, early Danian assemblages evolved in adaptation to high-stress conditions in the aftermath of the mass extinction and therefore survived phase-3 volcanism. Full marine biotic recovery did not occur until after Deccan phase-3. These data suggest that the catastrophic effects of phase-2 Deccan volcanism upon the Cretaceous planktic foraminifera were a function of both the rapid and massive volcanic eruptions and the highly specialized faunal assemblages prone to extinction in a changing environment. Data from the K-G Basin indicates that Deccan phase-2 alone could have caused the KTB mass extinction and that impacts may have had secondary effects.
Keywords
Cretaceous-Tertiary, Mass Extinction, Deccan Volcanism, Longest Lava Flows, Krishna-Godavari Basin.References
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