Journal of the Palaeontological Society of India最新文献

{"title":"A freshwater ostracod assemblage from the Kesavi intertrappean beds (latest Cretaceous/earliest Paleocene) of lower Narmada Valley, Malwa Sub-province of Deccan Traps, Dhar District, Madhya Pradesh, India","authors":"Ravi Yadav, A. S. Maurya","doi":"10.1177/05529360231181799","DOIUrl":"https://doi.org/10.1177/05529360231181799","url":null,"abstract":"We here report a new freshwater ostracod assemblage comprising 11 species ( Frambocythere tumiensis anjarensis, Gomphocythere paucisulcatus, G. strangulata, Limnocythere deccanensis, Zonocypris spirula, Eucypris intervolcanus, Cypria cyrtonidion, Stenocypris cylindrical, Cypridopsis hyperectyphos, Candona amosi, Eucypris sp.) from a newly discovered intertrappean locality at Kesavi, Dhar District, Madhya Pradesh. This locality lies in the lower Narmada Valley of Malwa sub-province, a poorly studied region of the Deccan Traps volcanic province of peninsular India compared to the other volcanic sub-provinces. The ostracod assemblage from Kesavi is similar to those known from different parts of the Deccan volcanic province and lacks any brackish or marine elements. The endobenthic crawler Frambocythere tumiensis dominates the assemblage, indicating a lacustrine freshwater depositional environment.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135958984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revised lithostratigraphic classification of the Cambrian Kunzam La Formation and its biostratigraphic correlations from Zanskar to Spiti, Tethyan Himalaya","authors":"Birendra P. Singh, O. N. Bhargava, Vishal Verma, Ravi S. Chaubey, S. K. Prasad","doi":"10.1177/05529360231182287","DOIUrl":"https://doi.org/10.1177/05529360231182287","url":null,"abstract":"In the northwest Himalayas, the Cambrian sequences forming part of the Tethyan Himalayan Zone are well preserved in the Zanskar and Spiti regions. In the present work, we critically examine the geologic, stratigraphic and biostratigraphic aspects of the Cambrian Kunzam La Formation exposed in the Zanskar (i.e., in the Niri-Tsarap Chu and Kurgiakh valleys) and Spiti regions (i.e., in Chandra, Parahio, Pin and Sumna valleys sections). Although the Kunzam La Formation is extensively developed, none of the sections from Zanskar to the Spiti regions preserves its complete succession. The present work reveals the presence of a fault in each studied section, which has eliminated different stratigraphic portions of the Kunzam La Formation. Therefore, based on overall lithologic characteristics, biostratigraphic parameters and local preservation state, this formation is re-classified into three formal members: the Chandra, Parahio and Purni. We also present lithostratigraphic and biostratigraphic correlations of the Kunzam La Formation from the Zanskar to Spiti regions, which validate our lithostratigraphic division.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136154561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>Trypanites</i> ichnofacies and its multifarious significance: A case study from the Miocene Boka Bil Formation of Manipur, India","authors":"Khundom Inaobi, Pradeep Kundal, Mairenbam Chandra Singh, Chabungbam Sharatchand Singh","doi":"10.1177/05529360231181818","DOIUrl":"https://doi.org/10.1177/05529360231181818","url":null,"abstract":"Bioerosional structures are well preserved in the Miocene Boka Bil Formation, exposed in the Kaiphundai section, Thangjing Hill Range of Manipur, India. Eleven ichnospecies representing the Trypanites Ichnofacies, viz., Entobia cateniformis, E. ovula, Gastrochaenolites anauchen, G. cluniformis, G. lapidicus, G. orbicularis, G. ornatus, G. torpedo, Maeandropolydora sulcans, Trypanites solitarius and T. weisei, are recorded from the two sections of the Boka Bil Formation. Two distinctive ichnoassemblages, Entobia-dominated and Gastrochaenolites-dominated are recognised. The Entobia-dominated assemblage suggests relatively deeper marine conditions in the deeper part of the back reef or fore reef while the Gastrochaenolites-dominated assemblage points shallower marine conditions, underwater depth of a few metres in the back reef to patch-reef zone of a back-reef lagoon.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136235336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution of recent Benthic foraminifera in Kongsfjorden and Krossfjorden; North-West Svalbard, High Arctic","authors":"Debolina Chatterjee, Anupam Ghosh","doi":"10.1177/05529360231183470","DOIUrl":"https://doi.org/10.1177/05529360231183470","url":null,"abstract":"Benthic foraminifera assemblages from two fjords of Svalbard—Kongsfjorden and Krossfjorden in the High Arctic—have been studied. The foraminifera assemblages show three characteristic assemblages from the two fjords’ glacial proximal, middle and distal parts. The Cassidulina reniforme– Elphidium clavatum, Textularia spp. assemblage dominates the foraminifera fauna near the glacier proximal that indicates increased sedimentation and meltwater runoff; a Nonionellina labradorica– Islandiella helenae– Lobatula lobatula assemblage relates to well-oxygenated and high energy conditions and mainly occupies the middle part; and the Nonionellina labradorica– Islandiella helenae assemblages dominate in the distal region that indicates high surface primary productivity. Krossfjorden contains an oxygen deficiency zone around the middle part characterised by Stainforthia loeblichi. The abundance of Islandiella helenae and Nonionellina labradorica indicates that the high surface primary productivity of Krossfjorden is more than that of Kongsfjorden.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136153818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diatom response in different climatic zones from west coast of India","authors":"Pooja Tiwari, Purnima Srivastava, Biswajeet Thakur","doi":"10.1177/05529360231182261","DOIUrl":"https://doi.org/10.1177/05529360231182261","url":null,"abstract":"Coastal margins and their ecological setting are one of the magnificent landforms on globe. The complex interaction among the different biotic and abiotic components through ages has addressed that due to climatic changes the coastal regions, one of the pioneer regions, have been getting affected and this may continue in the future also. The role of microfossils through ages has helped in delineating the past climatic manifestations and global changes and amongst them diatoms also provide a valuable tool for inferring past climate and ecological variability in the dynamic coastal system. In the study, a modern set of 77 samples from different climatic zones along the west coast of India has been studied to gain knowledge about the present-day climate status and record environmentally susceptible diatoms to form a modern analogue for coastal settings. The study shows various associations of planktic and benthic diatoms that hitherto provide precious information about the diatoms and their relation to the climatic regions and ecological status. The change in the frequency of planktic and benthic diatoms inculcate the water levels, pH, salinity changes, tidal variability and trophic status. Hence, the study aims to provide a robust database on diatoms for the various climatic zones from the west coast of India and would inevitably fill knowledge gap in terms of primary productivity for broad implications. The study also aims to provide background for transfer-based function for the reconstruction of long-term palaeoclimatic records for the transition zone of terrestrial and oceanic realms.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134913054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"First record of late Devonian-early Carboniferous palynoflora from the Lipak Formation, Spiti Basin, Tethyan Himalaya, India, and their biostratigraphic implications","authors":"Suyash Gupta, Anju Saxena, Husain Shabbar, Srikanta Murthy, Kamal Jeet Singh, Rameshwar Bali","doi":"10.1177/05529360231182233","DOIUrl":"https://doi.org/10.1177/05529360231182233","url":null,"abstract":"The present work elucidates palynofloral records from the Lipak Formation (late Devonian– early Carboniferous) of the Spiti Basin. The study has been carried out from three different sections of Spiti and Pin valleys to look for the signatures of terrestrial plants in the Tethyan realm and assess the relative palynodating of the studied sediments. The recovered palynoassemblage from the exposures of Lipak Formation, near Takche Locality, Spiti Valley, mainly comprises spores and has the dominance of Verrucosisporites, Dictyotriletes, Lophozonotriletes, Convolutispora followed by subordinate occurrences of Rugospora, Cymbosporites and Knoxisporites along with reworked pollen grain Plicatipollenites. The recovered palynoassemblage of Lipak Formation exposure at Guling Village of Pin Valley comprises Spelaeotriletes, Tricidarisporites, Calamospora, Callumispora and reworked pollen grains. The reworked pollen grains are characterised by the dominance of Faunipollenites, Scheuringipollenites and Parasaccites and followed by subordinate occurrences of the Densipollenites, Striatopodocarpites, Platysaccus, Alisporites, Striomonosaccites, Chordasporites and Verticipollenites pollen grains. The exposure of this Formation near Muth Village of Pin Valley is found to be palynologically barren. The recovered palynoflora is correlated with palynofloral records of the Tethyan realm of India and palynofloral records from coeval sequences worldwide. The recovered palynocomposition shows a close resemblance to Retispora lepidophyta–Verrucosisporites nitidus (LN) and Vallatisporites verrucosus–Retusotriletes incohatus (VI) Assemblage zones of Western Europe and Cordylosporites–Verrucosisporites Biozone of Argentina which indicates that studied section of the Lipak Formation is upper Famennian to early Tournaisian age. The recovered reworked palynomorphs belong to the Permian age, which may be deposited in the Lipak Formation through stratigraphic leakage. Palynomorphs include spores of affinities of Zygopteridiales, Marattiales, Botryopteridales, Equisetales/Noeggerathiales/Sphenophyllales group of plants. In contrast, palaeobotanical affinities of pollen grains are linked with the Filicales, Cordaitales and Glossopteridales group of plants.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134912702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-resolution calcareous nannofossil biostratigraphy and facies of Nimar Sandstone Formation (Bagh Group), central India and its bearing on Oceanic Anoxic Event 2","authors":"Syed A. Jafar","doi":"10.1177/05529360231200513","DOIUrl":"https://doi.org/10.1177/05529360231200513","url":null,"abstract":"It is proposed to consider Narmada Valley Late Cretaceous sequences in three sectors with proper selection of stratotype in each sector: Eastern Sector: comprising of Lameta group of rocks with type area in Jabalpur area, essentially laid down in lacustrine-paedogenic milieu and containing a variety of fossils including dinosaur remains of Late Maastrichtian age. No evidence of sea incursion is available in the Eastern Sector either via the Narmada lineament or the K-G Basin. Central Sector: comprising of the Bagh Group in ascending order of: Nimar Sandstone Formation–Nodular Limestone Formation–Coralline-Bryozoan Limestone Formation, laid down in estuarine complex entirely within Turonian without any evidence of Cenomanian and Coniacian age calcareous nannofossils or other fossils being present. In the western part of Central Sector: Siliciclastic rocks and limestones referred to as Nimar Sandstone Formation curiously lack Late Cenomanian marker species, hence could be of Early Turonian age. Western Sector: comprises of Lacustrine sediments associated with Deccan Flood Basalt. The absence of the Cenomanian/Turonian Boundary and Black shales negates the presence of global OAE2 events in the Narmada lineament, but several OAE events are recognised in the Cauvery Basin, southeastern India. Uranium- and Thorium-rich Lower and Upper Nimar Sandstone Formation overlying crystalline basement are interpreted to have been essentially laid down in a fully marine estuarine milieu with reworked plant, and palynofossils including dinosaur remains. Calcareous nannofossils recovered from Upper Nimar Sandstone Formation over four decades ago and assigned Late Turonian age is revised based on modern data incorporating calcareous nannofossil and planktonic foraminifera datum and now suggest an older age of Early Turonian matching a zone with FAD of Quadrum gartneri at the base and FAD of H. helvetica at the top. It must be emphasised that except for the solitary and unique incursion of Early Turonian (ca. 93.9 Ma) sea along the Narmada lineament reaching eastward (&gt;300 km) up to the present town of Indore, no other marine intrusion ever took place on Indian shield except along collision facing Subathu–Dogadda lineament during Late Maastrichtian. It would be erroneous to suggest that the global eustatic rise of sea level caused the entry of the Turonian sea along the Narmada lineament; instead, it was earlier speculated by me that Large Igneous Province activity of Mahajanga Flood Basalt of Madagascar (ca. 93.9 Ma) could have most probably caused a short-lived Turonian sea to enter Narmada lineament from the west around C/T boundary.","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135194205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TRILOBITE TRACE FOSSILS MADE FOR MOULTING","authors":"A. Seilacher","doi":"10.15496/PUBLIKATION-8619","DOIUrl":"https://doi.org/10.15496/PUBLIKATION-8619","url":null,"abstract":"","PeriodicalId":48900,"journal":{"name":"Journal of the Palaeontological Society of India","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67157436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}