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
Patel, Satish J.
- Analysis of Ichnoguilds and their Significance in Interpreting Ichnological Events: A Study from Jhuran formation (Upper Jurassic), Western Kachchh
Authors
1 Institute of Petroleum Technology, Gandhinagar, Raisan Village, Gandhinagar-9, IN
2 Department of Geology, M.S.University of Baroda, Vadodara-390002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No 4 (2008), Pagination: 458-466Abstract
The ichnological study of the Jhuran Formation (Kimmerdgian-Tithonian) exposed at Jara Dome of Western Kachchh has revealed the presence of twenty-two ichnospecies. These ichnofossils are typically well expressed at bed transitions, especially at intercalated shale-siltstone-sandstone sequences. The Jhuran Formation is divided into seven lithounits represented by six ichnoguilds exhibiting four distinguishable ichnological events. These events can provide important information on palaeoenvironment, depositional cyclicity and behaviour of the trace making communities. This is illustrated by the quantitative analysis of ichnoguilds in the intercalated sequence. The recurring patterns of the ichnoguilds reveal activity levels within the substrate, feeding style and also reflect colonization events at different beds. The dominance of structures produced by specialized organisms is consistent with an open marine unconsolidated substrate setting. The typical features of each ichnoguild allow characterization and comparison of local palaeoenvironmental conditions (depth, hydrodynamic condition, etc) which mark different ichnological events in the upper Jurassic sequence of the Western Mainland Kachchh basin.Keywords
Trace Fossils, Ichnoguilds, Ichnological Events, Jara Dome, Jhuran Formation, Western Kachchh.- Trace Fossil Assemblages (Ichnocoenoses) of the Tectonically Uplifted Holocene Shorelines, Kachchh, Western India
Authors
1 Institute of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar, IN
2 Department of Geology, 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 71, No 4 (2008), Pagination: 527-540Abstract
The Kachchh coastline (Western India) displays Holocene raised beaches and moderately dewatered tidal mud with abundant mangrove trunks. These deposits contain abundant crustaceans, polychaetes and bivalve traces of subtidal to intertidal origin. Ichnologically these deposits are characterised by ichnospecies like Gastrochaenolites, Skolithos, Ophiomorpha, Polykladichnus and Thalassinoides. These structures are grouped into three ichnocoenoses, viz, Glossifungztes, Skolithos and Ophzomorplza These ichnocoenoses are interpreted as environmentally distinct group of traces of the single endobenthic community like crustacean, polychaetes and bivalves, made in the intertidal zone. They are exposed at different levels in the intertidal-Supratidal zone. Raised beaches are extremely bioturbated and contain well developed Skolithos and Ophiomorpha ichnocoenoses along with soft sediment deformational structures ascribed to seismic origin, while raised mud flats comprise of Glossifungites, Skolithos and Ophzomorpha ichnocoenoses.Keywords
Trace Fossils, Tectonics, Uplifted Shorelines, Holocene, Kachchh and Western India.- Kachchh Earthquake of 2001: Seismically Triggered Deformed Structures in the Intertidal Sediments of Mandvi Coast in the Gulf of Kachchh, Gujarat
Authors
1 Department of Geology, M S University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 5 (2004), Pagination: 637-646Abstract
On 26 January 2001, a major earthquake of magnitude of 77 caused extensive damage in Kachchh and other parts of Gujarat Mandvi coast in the Gulf of Kachchh, which is 150 km far from the epicentral zone, is also highly affected by the high magnitude seismic waves causing deformed structures in soft sediments. These induced deformed soft sediment structures are recorded in the small lagoon adjoining the beach area. The structures include sand blows, cracks, micro faulting, deformed Cross-Laminae, flume and pillar structures and large injection structures, which are attributed to intrusion spout phenomena. Abnormal behaviour of suspension feeding squillidean stomatopod, Oratosquilla striata species, was also observed. These structures are interpreted to originated by the process of fluidisation and liquefaction of cohessroniess peaty subsurface layer undeineath the clastic sediments. The shear stress related to earthquake acted as trigger agent.Keywords
Seismic Deformation, Intertidal Sediments, Liquefied Peaty Layer, Kachchh Earthquake, Mandvi Coast, Gujarat.- The Republic Day Kachchh Earthquake of 2001: Trauma in Oratosquilla striata
Authors
1 Department of Geology, M.S. University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 3 (2001), Pagination: 215-216Abstract
No Abstract.- Burrowing Activities of Goby Fish in the Recent Intertidal Mud Flats along the Navinal Coast, Kachchh, Western India
Authors
1 Department of Geology, M. G. Science Institute, Navrangpura, Ahmedabad - 380 009, IN
2 Department of Geology, M. S. University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 4 (2009), Pagination: 515-530Abstract
Behavioural activities of the goby fish-Periophthalmodon septemradiatus were observed in the intertidal zone around Navinal coast in the Gulf of Kachchh, western India. Intertidal zone is broad, and comprise of creeks, which are muddy and vegetated by mangrove on eastern side and ridge runnel systems on western side of the study area which are hospitable for the goby fish. Different types of biogenic activities are observed such as crawling, pellet making, grazing and burrowing. The crawling activity is part of movement of the goby fish from one burrow to another burrow and pellet making activity is part of burrow modification. The grazing activity is feeding on the surface mud after receding of tide and exposure of the tidal flat by left and right movement of the front part of the body. The most conspicuous activity is burrowing, they construct unlined, vertical to incline 'I', 'J' and 'Y' shaped branched, circular to oval burrows with varying diameter and depth. In the muddy sediments goby fish produced circular to oval rimmed muddy lumps as surfacial expression around the burrows and further produced funnel shape depression and downward extended cylindrical holes, while in the runnels burrows are usually small and simple. The trail is consisting of fin marking on either side of the tail marks (grooves) which are radiate around the burrows. Occasionally burrows are interconnected in more than one burrow system which is nested within single funnel structure on the surface.
The burrow systems of the goby fish in the intertidal sediments serves for protection and dwelling purpose and most importantly these burrows are irrigated by water which supply the oxygen and keep body surface wet. The overall dimensions of the burrow decrease towards the lower intertidal zone. In all, behavioural structure produced by the goby fish marks the combined activity of dwelling, feeding and grazing. The complex behavioural mechanisms have helped the goby fish to survive and flourish in the harsh intertidal environments along the Navinal Coast, in the Gulf of Kachchh.
Keywords
Mud-Skippers, Biogenic Activities, Intertidal, Navinal, Gulf of Kachchh, Gujarat.References
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- Upper Callovian-Middle Oxfordian Belemnite Assemblage from Jara Dome, Western Kachchh
Authors
1 Institute of Petroleum Technology, P.D.P.U. Raisan Village, Gandhinagar - 382 009, IN
2 Department of Geology, M. S. University of Baroda, Vadodara - 390 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 3 (2009), Pagination: 343-356Abstract
Belemnites and ammonites were collected from the Dhosa Oolite beds of Jara Dome in Kachchh. The Dhosa Oolite is an important marker of the Mesozoic sediments exposed in the Kachchh Basin. Nine belemnite species are reported belonging to four genera Belemnopsis, Demubelus, Hibolithes and Conodicoelites. These include Belemnopsis cf. moluccana Boehm, B. calloviensis Oppel, Demubelus weberi Stolley, Hibolithes boloides Stolley, H. longiscissus Stolley, H. cf. compressus Stolley, H. jumarensis Waagen, H. budhaichus Stoliczka and Conodicoelites cf. abadi Challinor. Besides the belemnites, diagnostic ammonoid fauna are also recorded from the studied section enabling better controlled stratigraphic resolution and biostratigraphic correlation. Taxonomic studies on the different belemnite species are presented with illustration for reference.Keywords
Belemnites, Ammonites, Callovian, Oxfordian, Jara Dome, Western Kachchh, Gujarat.References
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- Animal-Sediment Relationship of the Crustaceans and Polychaetes in the Intertidal Zone Around Mandvi, Gulf of Kachchh, Western India
Authors
1 Department of Geology, M. S. University of Baroda, Vadodara - 390 002, IN
2 Institute of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 2 (2009), Pagination: 233-259Abstract
Animal-sediment relationships of two benthic communities (Crustaceans and Polychaetes) were studied around Mandvi coast in the Gulf of Kachchh, Western India. This coast consists of many micro-geomorphic landforms in which benthic communities are inhabited and select their niches and produce endemic biogenic structures. Five intertidal subfacies have been described and four types of grounds are identified, based on substrate consistency. 18 species of crustaceans, 15 species of polychaetes and unsegmented worm nemertea have been identified. Crustacean behavioural activities were observed in dunes, beaches and ridge-runnel in the form of burrowing, pellet making, feeding and crawling traces. Pelleted wall lining burrows of the suspension feeder stomatopodean species of Oratosquilla striata are also abundant in runnels. Motile, deposit feeder polychaetes are abundant on the ridges and are occasionally found on the lower reaches of the beaches, while suspension and filter feeders are found in the runnels. Lagoons consist of mainly grouped funnel branched burrows of Oniphus eremita which is identical to ichnogenus Balanoglossites. Nemertea, which are opportunistic algal grazers, have exploited restricted niches for dwelling-feeding purposes and constructed vertical burrow with pentamerous conical mound. The shore platform consists of cemented, calcareous tubes of filter feeder Serpula along with symbiotic encrusters like Ostrea and barnacles. Ichnocoenoses are discussed and three-dimensional ichno-sedimentologic models are reconstructed for Beach, Ridge, Runnel and Lagoon of the Mandvi intertidal zone.Keywords
Bioturbation Structures, Intertidal Facies, Substrate Consistency, Mandvi Coast, Kachchh.References
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- Bathymetric Significance of the Ichnofossil Assemblages of the Kulakkalnattam Sandstone, Ariyalur Area, Cauvery Basin
Authors
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.- Trace Fossil Assemblages in Mixed Siliciclastic-Carbonate Sediments of the Kaladongar Formation (Middle Jurassic), Patcham Island, Kachchh, Western India
Authors
1 Department of Geology, The Maharaja Sayajirao University of Baroda, Vadodara - 390 002, IN
2 Geology Department, M.G. Science Institute, Navrangpura, Ahmedabad - 390 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 80, No 2 (2012), Pagination: 189-214Abstract
The Middle Jurassic rocks of the Kaladongar Formation well exposed in the Kaladongar Hill range of the Patcham Island and Kuar Bet of the Northern Kachchh comprises of ∼450 m thick sequence of mixed siliciclastic-carbonate sediments intercalated with shales. These Mixed siliciclastic-carbonate sediments show wide variation in textural and mineralogical composition and represent genetically related six rock types: micritic sandstone, allochemic sandstone, sandy allochemic limestone, micrtic mudrock, sandy micrite and muddy micrite; which are highly bioturbated and show behaviourally diverse groups of trace fossils. Total 34 ichnogenera are identified, which includes, Arenicolites, Asterosoma, Beaconites, Bergaueria, Chondrites, Cochlichnus, Dactylophycus, Daedalus, Didymaulichnus, Diplocraterion, Gordia, Gyrochorte, Gyrolithes, Ichnocumulus, Laevicyclus, Lockeia, Margaritichnus, Monocraterion, Nereites, Ophiomorpha, Palaeophycus, Phoebichnus, Phycodes, Pilichnus, Planolites, Plug Shaped Form, Protovirgularia, Rhizocorallium, Scolicia, Skolithos, Taenidium, Teichichnus, Thalassinoides and Walcottia. These trace fossils are classified into six morphological groups namely, circular and elliptical structures; simple structures; branched structures; rosette structures; spreiten structures; and winding and meandering structures. These trace fossils are further group into eight assemblages which occurred together into mixed siliciclastic-carbonate sediments, include, Asterosoma assemblage, Gyrochorte assemblage, Rhizocorallium assemblage, Thalassinoides assemblage, Planolites-Palaeophycus assemblage, Phycodes assemblage, Ophiomorpha assemblage and Skolithos assemblage. The recurring pattern of these assemblages through the sequence displays the development of Skolithos and Cruziana ichnofacies and at places the mixed Skolithos-Cruziana ichnofacies which suggest a low wave and current energy conditions with intervening period of high wave and current energy conditions and an intermediate period of stressful environments, respectively. Sedimentological and ichnological data suggest that the deposition of the mixed siliciclastic-carbonate sediments of the Kaladongar Formation took place in the foreshore to offshore environment under fluctuating wave and current energy condition.Keywords
Mixed Siliciclastic-Carbonate Sediments, Trace Fossil Assemblages, Shallow Marine, Kaladongar Formation, Middle Jurassic, Kachchh, Western India.References
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