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Kulkarni, Kantimati G.
- Gastrochaenolites Bioerosion in the Kalyanpur Limestone (Pliocene) of Dwarka Area, Kathiawar, Gujarat
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Authors
Affiliations
1 Palaeobiology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune – 411 004, IN
1 Palaeobiology 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 72, No 6 (2008), Pagination: 774-780Abstract
Well preserved flask shaped borings belonging to ichnogenus Gastrochaenolites Leymerie, (1842) are being reported from the Kalyanpur Limestone Member (Pliocene) of Dwarka Formation, Jamnagar district, Kathiawar Region, Gujarat. The ichnofauna consists of Gastrochaenolites ampullatus Kelly and Bromley, G. cluniformis Kelly and Bromley, G. lapidicus Kelly and Bromley, G. orbicularis Kelly and Bromley, G. ornatus Kelly and Bromley, G. torpedo Kelly and Bromley, G. turbinatus Kelly and Bromley, and Gastrochaenolites isp. Though individuals of groups other than bivalves are known to create Gastrochaenolites-like borings, these borings were evidently emplaced by bivalves alone, confirmed by the presence of bivalve casts in some of the specimens. This hardground suggests an intraformational break in deposition.Keywords
Bioerosion, Gastrochaenolites, Neogene, Pliocene, Kathiawar, Gujarat.- Ichnofossils from the Fort Member (Middle Jurassic), Jaisalmer Formation, Rajasthan
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Authors
Affiliations
1 Geology and Palaeontology Group, Agharkar Research Institute, G. G. Agarkar Road, Pune-411004, IN
1 Geology and Palaeontology Group, Agharkar Research Institute, G. G. Agarkar Road, Pune-411004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 5 (2008), Pagination: 731-738Abstract
An ichnoassemblage from the Fort Member, Jaisalmer Formation, occurring in a hill north of the city of Jaisalmer is described. It comprises Arenicolites tenuis isp. nov., Bichordites isp., Planolites isp., Rhizocoralliurn irregulare Mayer, Rhizocorallium jenense Zenker, Taenidium serpentinurn Heer and Thalassinoides isp. Overall paucity of repichnia in an ichnoassemblage vis-a-vis noticeable dominance of domichnia and fodinichnia implies abundance of detrital nutrients. Host rocks yielding this ichnoassemblage are current bedded calcarenite showing fine shell hash along current beds and clayey limestones with presence of small, lenticular storm bed intercalations. They suggest near-shore, moderate-to strong-energy marine conditions rich in organic nutrients, supporting inferences drawn on the basis of trace fossils. The beds containing this ichnoassemblage are assigned ages ranging from Bathonian to Callovian, and hence considered here Middle Jurassic.Keywords
Trace Fossils, Fort Member, Middle Jurassic, Jaisalmer, Rajasthan.- Entobian Bioerosion of Miocene Oysters, Kachchh, Gujarat
Abstract Views :222 |
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Authors
Affiliations
1 Geology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune - 411 004, IN
1 Geology 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 69, No 4 (2007), Pagination: 827-833Abstract
Idiomorphic clionid borings were discovered on some of the oyster shells occurring in limestone intercalations within the Claystone Member of the Chhasra Formation (Burdigalian, Miocene), Kachchh, Gujarat. Epoxy resin was injected in a fragmentary shell of Crassostrea gingensis, which subsequently was completely dissolved in dilute hydrochloric acid. Examination of artificial casts of borings, thus obtained, revealed presence of three ichnospecies of Entobia. An open camerate system with long, cylindrical chambers is diagnostic of E. catenifomis, while camerate system of E. laquea consists of lace-like network of small, globose, equidimensional chambers. Entobia isp. A shows limited exploratory threads and small irregularly distributed apertures. Entobian borings suggest clear, well-Illuminated, shallow, sublittoral waters with little sediment input. However, proliferation of these borings is not very extensive in the limestone intercalations under consideration, suggesting that the spell of nondeposition must have been short. It is interesting to note that out of seven oyster species known from the Miocene strata of Kachchh, clionid borings were observed on only two species viz., Hyotissa hyotis and Crassostrea gingensis.Keywords
Miocene Oysters, Bioerosion, Entobia, Kachchh, Gujarat.- Scrutiny of the Earliest Records of Biogenic Sedimentary Structures from the Proterozoic Rock formations of the Indian Shield
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Authors
Affiliations
1 Geology Group, Agharkar Research Institute, G.G. Agarkar Road, Pune 411 004, IN
1 Geology 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 63, No 2 (2004), Pagination: 222-226Abstract
No Abstract.- Trace Fossils and Pseudofossils from the Proterozoic Cuddapah Supergroup
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Authors
Affiliations
1 Agharkar Research Institute, G .G. Agarkar Road, Pune - 411 004, IN
1 Agharkar Research Institute, G .G. Agarkar Road, Pune - 411 004, IN