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Malarkodi, N.
- Genus Thalmannita (Foraminifera) from the Niniyur Formation (Paleocene), Ariyalur Area, South India
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore-560 056, IN
1 Department of Geology, Bangalore University, Bangalore-560 056, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 3 (1998), Pagination: 361-366Abstract
Thalmannita in the South Indian Paleocene, outside the West European and Tethyan biogeographic realms, is recorded for the first lime. The genus has two existing species madrugaensis and hajeezi. The following four new species are added namely, Thalmannita niniyurensis n.sp. T. adanakurchchensis n.sp., T. gowdai n.sp. and T. sastryi n.sp. The Thalmannita is a well known guide fossil of the Paleocene age.Keywords
Micropalaeontology, Foraminifera, Niniyur Formation, Paleocene, Tamil Nadu.- Forams-2006
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Authors
Affiliations
1 Dept of Geology, Bangalore University Bangalore - 560 056, IN
1 Dept of Geology, Bangalore University Bangalore - 560 056, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 4 (2007), Pagination: 875-875Abstract
No Abstract.- Palaeoenvironmental Significance of Trace Fossils from the Palaeocene Sediments of the Pondicherry Area, South India
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Geology, M.S. University, Baroda - 390 002, IN
3 Geology Division, Civil Engineering Department, Islamiah Institute of Technology, National Park Road, Bangalore - 560076., IN
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Geology, M.S. University, Baroda - 390 002, IN
3 Geology Division, Civil Engineering Department, Islamiah Institute of Technology, National Park Road, Bangalore - 560076., IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 6 (2009), Pagination: 738-748Abstract
Sediments of Manaveli Formation (Palaeocene) are studied from the Thondaimanattam quarry section and Manaveli section of the Pondicherry area, which comprises of bioturbated arenaceous limestone-shale and shaly-sandstone sequences respectively. These sediments consist of high density and low diversity trace fossil genera which includes Lanicodichnus, Ophiomorpha, Planolites, Palaeophycus, Skolithos, Thalassinoides, and Polychaetes tubes. The abundance of horizontal structures of the Thondaimanattam quarry section indicate low to moderate wave and current energy in fully marine subtidal environments while the presences of vertical structures of the Manaveli section indicate moderate to high wave and current energy in the marginal marine environment of deposition for the Palaeocene sediments of the Pondicherry area.Keywords
Trace Fossils, Palaeocene, Palaeoenvironment, Pondicherry.References
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- Foraminifera from the Early Danian Intertrappean Beds in Rajahmundry Quarries, Andhra Pradesh
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Geosciences, Princeton University, Princeton, NJ, 08544, US
3 Civil Engineering Department, Geology Division, Islamiah Institute of Technology, National Park Road, Bangalore - 560076, IN
1 Department of Geology, Bangalore University, Bangalore - 560 056, IN
2 Department of Geosciences, Princeton University, Princeton, NJ, 08544, US
3 Civil Engineering Department, Geology Division, Islamiah Institute of Technology, National Park Road, Bangalore - 560076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 6 (2010), Pagination: 851-863Abstract
Intertrappean beds exposed between upper and lower traps of the Government and Sunnamrayalu quarries of Rajahmundry were analyzed based on benthic and planktic foraminifera, ostracodes and algae observed in thin sections. Planktic foraminifera indicate deposition occurred in the early Danian Parvularugoglobigerina eugubina (P1a) zone shortly after deposition of the lower trap flows. The most diverse planktic assemblages were deposited in limestones of the middle intertrappean interval and indicate an upper P1a age, or subzone P1a(2), as marked by the co-occurrence of P. eugubina, Globoconusa daubjergensis, Parasubbotina pseudobulloides and Subbotina triloculinoides. Reworked late Maastrichtian planktic foraminifera are common in a limestone interval and suggest erosion of uplifted Cretaceous sediments. Benthic foraminiferal assemblages indicate deposition occurred predominantly in shallow inner shelf to brackish environments. Similarly, ostracodes indicate variable environments ranging from inner neritic to brackish with fresh water influx, as also indicated by the presence of fresh water algae. These data confirm an overall deepening from restricted shallow marine to estuarine, lagoonal and finally open marine conditions followed by abrupt emersion and paleosoil deposition prior to the arrival of the upper trap flows at or near the base of C29n.Keywords
Foraminifera, Ostracodes, Danian, Intertrappean, Rajahmundry, Andhra Pradesh.- Sequence Stratigraphy of Soma Quarry Section, Near Gowripatnam, Rajahmundry Area, Andhra Pradesh
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Authors
Affiliations
1 Department of Geology, Bangalore University, Bangalore – 560 056, IN
2 Civil Engineering Department, Geology Division, Islamiah Institute of Technology, National Park Road, Bangalore – 560 076, IN
1 Department of Geology, Bangalore University, Bangalore – 560 056, IN
2 Civil Engineering Department, Geology Division, Islamiah Institute of Technology, National Park Road, Bangalore – 560 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 2 (2010), Pagination: 111-118Abstract
An attempt is made to work out the sequence stratigraphic frame work of Infra and Intertrappean beds exposed in Soma quarry section, near Gowripatnam, Rajahmundry area to understand the mode of depositional process in the basin by integrating litho and biostratigraphic data. The study documents the field data to recognize some of sequence parameters in the field. The sequence stratigraphic study shows the Sequence Boundary, Transgressive Systems Tract (TST), three shallowing upward sequence, Maximum Flooding Surface (MFS) and Highstand Systems Tract (HST) deposits got exposed as a result of basinal rise and fall.Keywords
Sequence Stratigraphy, Parasequences, Infratrappeans, Intertrappeans, Duddukuru, Rajahmundry, Andhra Pradesh.- Neoarchaean Stromatolites from the Dharwar Supergroup, India
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Authors
Chethan Kumar
1,
Yogmaya Shukla
2,
Mukund Sharma
2,
S. B. Harish Kumar
3,
N. Malarkodi
1,
Saleem Ahmed Khan
4
Affiliations
1 Department of Geology, Bangalore University, Bengaluru 560 056, IN
2 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
3 Bhoogarbhdhama, No. 19, 1st Main, 4th Cross Road, New Maruthi Nagar Extension, Near MEI International School, Kempapura Road, Chikkabanavara, Bengaluru 560 090, IN
4 No. 291, JHBCS Layout, Near Dayanand Sagar College, Bengaluru 560 111, IN
1 Department of Geology, Bangalore University, Bengaluru 560 056, IN
2 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
3 Bhoogarbhdhama, No. 19, 1st Main, 4th Cross Road, New Maruthi Nagar Extension, Near MEI International School, Kempapura Road, Chikkabanavara, Bengaluru 560 090, IN
4 No. 291, JHBCS Layout, Near Dayanand Sagar College, Bengaluru 560 111, IN
Source
Current Science, Vol 125, No 4 (2023), Pagination: 435-441Abstract
A new occurrence of Neoarchean stromatolite, older than 2600 Ma, has been found in the dolomite beds of Aleshpur Formation of the Chitradurga Group in the Shimoga Schist Belt, western Dharwar Craton. The occurrence is near Shanti Sagara lake (Sulekere) in the Davangere district of Karnataka. Stratiform, laminated, columnar with some showing branching forms indicate an advanced stage of evolution of stromatolites. The newly found stromatolite occurrence is an important addition to the inventory of Archaean stromatolites.Keywords
Archaean, Dharwar Craton, Shimoga Schist Belt, Stromatolite.References
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