A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Rajshekhar, C.
- Foraminiferal Evidence for Sediments of Santonian Age Occurring on Baratang Island, Andaman, India
Authors
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
Authors
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
Authors
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
Authors
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
Authors
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
Authors
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
Authors
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
Authors
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.- Quaternary Stratigraphy of Andaman-Nicobar Islands, Bay of Bengal
Authors
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
Authors
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
Authors
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
Authors
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
- CULVER, S. (1988) New foraminiferal depth zonation of the northwestern Gulf of Mexico. Palaios, v.3, pp.69-85.
- EDWARDS, R. and HORTON, B. (2000) Reconstructing relative sea-level change using UK salt-marsh foraminifera. Marine Geol., v.169, pp.41-56.
- FOLK, R.L. and WARD, W.C. (1957) Brazos River bar: a study in the significance of grain size parameters. Jour. Sediment. Petrol., v.27, pp.3-26.
- FRIEDMAN, G.M. and SANDERS, J. 1978. Principles of Sedimentology, New York, Wiley.
- FRONTALINI, F. and COCCIONI, R. (2008) Benthic foraminifera for heavy metal pollution monitoring: A case study from the central Adriatic Sea coast of Italy. Estuarine, Coastal and Shelf Science, v. 76, pp. 404-417.
- GEBHARDT, H., KUHNT, W. and HOLBOURN, A. (2004) Foraminiferal response to sea level change, organic flux and oxygen deficiency in the Cenomanian of the Tarfaya Basin, southern Morocco. Marine Micropaleontology, v.53, pp.133-157.
- GEHRELS, W. (1999) Middle and late Holocene sea-level changes in eastern Maine reconstructed from foraminiferal saltmarsh stratigraphy and AMS 14C dates on basal peat. Quaternary Res., v. 52, pp. 350-359.
- GHOSH, A., SAHA, S., SARASWATI, P., BANERJEE, S. and BURLEY, S. (2009) Intertidal foraminifera in the macro-tidal estuaries of the Gulf of Cambay: Implications for interpreting sea-level change in palaeo-estuaries. Marine and Petroleum Geology, v.26, pp.1592-1599.
- GHOSH, A., SAHA, S., SARASWATI, P. K., BANERJEE, S., BURLEY, S. and RAO, G. (2008) Gallitellia–a proxy for palaeo-monsoonal upwelling on the western coast of India? Curr. Sci., v.95, pp.1608-1611.
- HALLOCK, P., LIDZ, B., COCKEY-BURKHARD, E. and DONNELLY, K. (2003) Foraminifera as bioindicators in coral reef assessment and monitoring: The FORAM Index. Environmental Monitoring and Assessment, v.81, pp.221-238.
- HAYWARD, B.W., GRENFELL, H.R., SABAA, A.T. and KAY, J. (2010) Using foraminiferal faunas as proxies for low tide level in the estimation of Holocene tectonic subsidence, New Zealand. Marine Micropaleontology, v.76, pp.23-36.
- HORTON, B.P., EDWARDS, R.J. and LLOYD, J.M. (1999) UK intertidal foraminiferal distributions: implications for sea-level studies. Marine Micropaleontology, v.36, pp.205-223.
- MASSEY, A., GEHRELS, W., CHARMAN, D. and WHITE, S. (2006) An intertidal foraminifera-based transfer function for reconstructing Holocene sea-level change in southwest England. Jour. Foraminiferal Res, v.36, pp.215.
- RAJ, R. and YADAVA, M. G. (2009) Late Holocene uplift in the lower Narmada basin, western India. Curr. Sci., v.96, pp.985-988.
- SCHAFER, C. (2000) Monitoring nearshore marine environments using benthic foraminifera: some protocols and pitfalls. Micropaleontology, v.46, pp.161-169.
- SUKUMARAN, P., SANT, D. A., KRISHNAN, K. and RANGARAJAN, G. (2012) High Resolution Facies record on Late Holocene Flood Plain Sediments from Lower reaches of Narmada Valley, Western India. Jour. Geol. Soc. India, v.79, pp.41-52.
- WOODROFFE, S. (2009) Recognising subtidal foraminiferal assemblages: implications for quantitative sea-level reconstructions using a foraminifera-based transfer function. Jour. Quaternary Sci., v. 24, pp. 215-223.
- ZERVAS, D., NICHOLS, G. J., HALL, R., SMYTH, H. R., LNTHJE, C. and MURTAGH, F. (2009) SedLog: A shareware program for drawing graphic logs and log data manipulation. Computers and Geosciences, v. 35, pp. 2151-2159.