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Rajshekhar, C.
- Foraminiferal Evidence for Sediments of Santonian Age Occurring on Baratang Island, Andaman, India
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Authors
Affiliations
1 M. A. C. S. Research Institute, Pune-411 004, IN
1 M. A. C. S. Research Institute, Pune-411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 1 (1989), Pagination: 19-31Abstract
The paper incorporates systematic descriptions of ten planktonic foraminiferal species recovered from the ejected material of mud volcanoes active on the Baratang Island, Andaman. The species are Pseudotextularia browni Masters, P. carseyae (Plummer, Globotruncana aegyptiaca Nakkady, G. arca (Cushman), G. concavata (Brotzen), G. coronata (Bolli), G. fornicata Plummer, G. gansseri Bolli, G. renzi Gandolfi and G. schneegansi Sigal.
Appearance of Rugoglobigerina rugosa, Ventilabrella glabrata, Globotruncana concavata and simultaneous extinction of G. schneegansi indicate Santonian as a lower age limit of Cretaceous rocks on the Baratang Island.
- Foraminifera from the Nodular Limestone, Bagh Beds, Madhya Pradesh, India
Abstract Views :192 |
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Authors
Affiliations
1 Department of Geology and Palaeontology, M.A.C.S. Research Institute, Law College Road, Pune 411 044, IN
1 Department of Geology and Palaeontology, M.A.C.S. Research Institute, Law College Road, Pune 411 044, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 38, No 2 (1991), Pagination: 151-168Abstract
The occurrence of twenty six benthic foraminiferal species belonging to the family Saccamminidae, Hormosinidae, Rzehakinidae, Haplophragmoididae, Lituolidae, Haplophragmiidae, Spiroplectamminidae, Tritaxiidae, Spiroloculinidae, Hauerinidae, Nodosariidae, Vaginulinidae, Turrilinidae, Bolivinidae, Siphogenerinoididae, Discorbidae and Nonionid ae from the Nodular limestone of the Bagh Beds, Madhya Pradesh is reported. The occurrence of mixed foraminiferal assemblage suggests normal and shallow marine conditions for the deposition of Nodular Limestone. In comparison to the underlying Nimar Sandstone, the Nodular Limestone shows high frequency of foraminifera, suggesting continued transgressive marine conditions.Keywords
Foraminifera, Nodular Limestone, Bagh Beds, Madhya Pradesh.- The Genus Hantkenina from Baratang Island, Andaman, India
Abstract Views :190 |
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Authors
Affiliations
1 M.A.C.S. Research Institute, Law College Road, Pune 411 004, IN
1 M.A.C.S. Research Institute, Law College Road, Pune 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 39, No 6 (1992), Pagination: 495-501Abstract
The paper records the planktonic foraminiferal genus Hantkenina Cushman from Baratang Island, Andaman. The specimens of Hantkenina were recovered from the clayey sediments ejected from mud vo1canoes. Besides the genus Hantkenina, the clay material also yielded abundant and mixed assemblage of foraminifera ranging in age from Late Cretaceous to Eocene. The present finding of the genus Hantkenina suggests the presence of Late Eocene subsurface sediments on Baratang Island.Keywords
Foraminifera, Baratang Island, Eocene, Andaman.- Foraminifera from the Bagb Group, Narmada Basin, India
Abstract Views :153 |
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Authors
Affiliations
1 Geology and Palaeontology, Agharkar Research Institute, Agarkar Road, Pune - 411 004, IN
1 Geology and Palaeontology, Agharkar Research Institute, Agarkar Road, Pune - 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 4 (1995), Pagination: 413-428Abstract
The sediments of the Bagh Group lack keeled Cretaceous index/zone foraminifera, and therefore, are not suitable for standard biostratigraphic zonation. However, abundance of certain foraminiferal taxa, viz. Gavelinella piummerae, Siphogenerinoides clarki, species of Hedbergella, Archaeoglobigerina and Heterohelix globulosaare noticed in Nimar Sandstone Formation, Nodular Limestone Formation, and Chirakhan Limestone Formation respectively.Overall foraminiferal assemblage which consists of more than 90% benthic and less than 10% planktonic elements is cosmopolitan and suggests a normal shallow marine environment of deposition. Frequency of foraminifera increases from the calc top ofNimar Sandstone to the uppermost marl and hence represents a transgressive phase.
The Bagh assemblage does not permit bed by bed correlation with the Cretaceous of Cauvery basin.
Keywords
Foraminifera, Micropaleontology, Turonian, Bagh Group, Gujarat.- Foraminifera from the Nodular Limestone, Bilthana, Gujarat: Stratigraphic Significance
Abstract Views :209 |
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Authors
Affiliations
1 Agharkar Research Institute, Agarkar Road, Pune 411004, IN
1 Agharkar Research Institute, Agarkar Road, Pune 411004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 45, No 5 (1995), Pagination: 585-593Abstract
On the basis of field and microfaunal evidences the Nodular Limestone of Bilthana and Man River Sections are considered to be the same lithounit, though different stratigraphic nomenclatures have been used for these two regions. This Limestone is bioclastic in nature and is not of chemical origin as was thought by earlier workers.
The hitherto unreported foraminifera from the Nodular Limestone of Bilthana, consist of planktonic as well as benthic foraminifera. The former is represented by Heterohelix globulosa, while the latter represent the species of Lagenammina, Scherochorella, Ammobaculites, Haplophragmoides, Spiroplectammina, Trochammina, Textularia, Dentalina, Vaginulina and Frondicularia. The presence of simple Lituolid genera such as Ammobaculites, Haplophragmoides and Trochammina indicates prevalence of shallow water (within shelf condition) during the deposition of this limestone at Bilthana.
Keywords
Foraminifera, Nodular Limestone, Stratigraphy, Gujarat.- Cretaceous Planktonic Foraminifera from the Cherty Limestone of Baratang Island, Andaman, India
Abstract Views :159 |
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Authors
Affiliations
1 Department of Geology and Palaeontology, MACS, Pune 411 004, IN
1 Department of Geology and Palaeontology, MACS, Pune 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 4 (1990), Pagination: 357-365Abstract
Late Cretaceous planktonic forarmruferal species viz, Guembeluna cretacea Cushman, Pseudoquembehna excolata (Cushman), Ventilabrella sp, Globigerinelloides sp , Hedbergella delrioensis (Carsey), H planispira (Tappan), Globotruncana concavata (Brotzen), G marginata (Reuss), G of rosetta and Rugoglobigerina macrocephala Bronnimann are reported from cherty limestone of Baratang Island, Andaman. The assemblage indicates dominance of Maestrichtian element Based on recorded stratigraphic ranges of different species the cherty limestone is assigned a Campanian-Maestrichtian age.Keywords
Palaeontology, Invertebrates, Foraminifera, Cretaceous, Andaman.- Significance of Fossils from the Rajpipla Limestone, Cretaceous of Narmada Basin Gujarat
Abstract Views :196 |
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Authors
Affiliations
1 Geology and Palaentology Group, Agharkar Research Institute, Agarkar Road, Pune - 411 004, IN
1 Geology and Palaentology Group, Agharkar Research Institute, Agarkar Road, Pune - 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 339-342Abstract
Mega fossil (fragments of Lame11ibranch shells, Gastropod, and Echionoid spines) in thin section and micro fossils (Benthic foraminifer Textularia sp.?) are being reported for the first time from the Rajpipla Limestone of Bagh Group.- On the Neill West Coast formation, Andaman Sea, Bay of Bengal
Abstract Views :179 |
PDF Views:157
Authors
Affiliations
1 Palaeobwlogv Group, Agharkar Research Institute, GG Agarkar Road, Pune - 411 004, IN
1 Palaeobwlogv Group, Agharkar Research Institute, GG Agarkar Road, Pune - 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 1094-1095Abstract
No Abstract.Full Text
- Quaternary Stratigraphy of Andaman-Nicobar Islands, Bay of Bengal
Abstract Views :173 |
PDF Views:2
Authors
C. Rajshekhar
1,
P. P. Reddy
1
Affiliations
1 Geology and Palaeontology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune - 411 004, IN
1 Geology and Palaeontology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune - 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 4 (2003), Pagination: 485-493Abstract
Pleistocene and Holocene formations in Andaman including the Ritchie's Archipelago were examined. Based on hthology and age the Neill West Coast Formation is emended and redesignated as Neill Formation. A new lithounit, the Chidyatapu Member is proposed here with its type locality and relationship with the underlying Limestone Member. Preliminary Petrographic observations assign biocalcarenite facies to the Chidyatapu Member.Keywords
Quaternary Stratigraphy, Chidyatapu Member, Neill Formation, Andaman-Nicobar Islands.- Late Quaternary Beach Rock Formations of Andaman-Nicobar Islands, Bay of Bengal
Abstract Views :205 |
PDF Views:2
Authors
C. Rajshekhar
1,
P. P. Reddy
1
Affiliations
1 Geology and Palaeontology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune 411 004, IN
1 Geology and Palaeontology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 5 (2003), Pagination: 595-604Abstract
The beach rock formations of south Andaman island are characterised by moderately soft to hard, fine to coarse grained/gritty, yellow to light buff coloured calcareous rocks. These rocks contain minute shells of gastropods and bivalves. The foraminifera are common and are dominantly represented by the species of the genus Pararotalia. The 14C dates of the beach rocks range from 4410- 1540 years B .P. The Wandoor beach rock with 1540- 1350 years B.P. is younger to the Chidyatapu beach rocks which have been dated 4410-3900 years B.P. PetrographicaIly, the Andaman beach rocks belong to algal biocalcarenite facies. The carbon isotope ages of the beach rock formations of the Indian Peninsula including Andaman indicate Late Holocene as a major transgressional event.Keywords
Holocene, Beach Rock, Foraminifera, Biocalcarenite, Andamans.- Occurrence of Late Cretaceous Cherty Limestone on Baratang Island, Andaman, India
Abstract Views :192 |
PDF Views:2
Authors
Affiliations
1 M.A.C.S. Research Institute, Law College Road, Pune 411 004, IN
1 M.A.C.S. Research Institute, Law College Road, Pune 411 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 3 (1989), Pagination: 325-328Abstract
A red cherty limestone containing rich Globotruncana assemblage of Maestrichtian age is reported from Japani Gole Jetty (NE corner) of Baratang Island, Andaman, India.- Late Holocene Storm Records from Lower Reaches of Narmada Valley, Western India
Abstract Views :719 |
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Authors
Affiliations
1 Institute of Seismological Research, Gandhinagar - 382 009, IN
2 Department of Geology, Wadia college, Pune - 411 001, IN
3 Department of Geology, IN
4 Department of Archaeology and Ancient History, The Maharaja Sayajirao University of Baroda, Vadodara - 390 002, IN
1 Institute of Seismological Research, Gandhinagar - 382 009, IN
2 Department of Geology, Wadia college, Pune - 411 001, IN
3 Department of Geology, IN
4 Department of Archaeology and Ancient History, The Maharaja Sayajirao University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 3 (2012), Pagination: 403-408Abstract
Storms from the Arabian Sea are the most significant meteorological feature in western India that brings extreme rainy days together with catastrophic flooding. The present study reports two such palaeo-storm horizons at 1.16 m and 3.2 m above the present day water level in the Narmada channel, 56 km inland based on sedimentology and foraminiferal records. Both the horizons show similar sediment facies and foraminiferal assemblage. The present findings instigate to look for such new sites and build palaeo-storm records for western India.Keywords
Palaeo-Storm, Late Holocene, Foraminifera, Flood Plain, Narmada Valley, Western India.References
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