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Desai, Bhawanisingh G.
- Analysis of Ichnoguilds and their Significance in Interpreting Ichnological Events: A Study from Jhuran formation (Upper Jurassic), Western Kachchh
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1 Institute of Petroleum Technology, Gandhinagar, Raisan Village, Gandhinagar-9, IN
2 Department of Geology, M.S.University of Baroda, Vadodara-390002, IN
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
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Affiliations
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
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.- The Republic Day Kachchh Earthquake of 2001: Trauma in Oratosquilla striata
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Authors
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1 Department of Geology, M.S. University of Baroda, Vadodara - 390 002, IN
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.- Upper Callovian-Middle Oxfordian Belemnite Assemblage from Jara Dome, Western Kachchh
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Authors
Affiliations
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
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
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Authors
Affiliations
1 Department of Geology, M. S. University of Baroda, Vadodara - 390 002, IN
2 Institute of Petroleum Technology, Pandit Deendayal Petroleum University, Gandhinagar, IN
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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