Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India
A palynological study on subsurface Early Cretaceous sediments (1550–1860 m) in well JM-A located in Dhansiri Valley, Upper Assam Shelf has been carried out for determination of age and depositional environment. The palynological investigations resulted into the identification of the characteristic...
Published in: | Journal of the Palaeontological Society of India |
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2023
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Online Access: | http://dx.doi.org/10.1177/05529360231219329 http://journals.sagepub.com/doi/pdf/10.1177/05529360231219329 http://journals.sagepub.com/doi/full-xml/10.1177/05529360231219329 |
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crsagepubl:10.1177/05529360231219329 2024-04-07T07:47:40+00:00 Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India Geddada, Divya Narsimha, Kanchi 2023 http://dx.doi.org/10.1177/05529360231219329 http://journals.sagepub.com/doi/pdf/10.1177/05529360231219329 http://journals.sagepub.com/doi/full-xml/10.1177/05529360231219329 en eng SAGE Publications https://creativecommons.org/licenses/by-nc/4.0/ Journal of the Palaeontological Society of India volume 68, issue 2, page 199-206 ISSN 0552-9360 2753-7269 Paleontology journal-article 2023 crsagepubl https://doi.org/10.1177/05529360231219329 2024-03-08T03:19:16Z A palynological study on subsurface Early Cretaceous sediments (1550–1860 m) in well JM-A located in Dhansiri Valley, Upper Assam Shelf has been carried out for determination of age and depositional environment. The palynological investigations resulted into the identification of the characteristic and diversified occurrence of Early Cretaceous dinoflagellate cysts comprising Batioladinium micropodum, Achomosphaera? neptuni, Batiacasphaera asperata, Lagenorhytis sp. cf. L. delicatula, Mendicodinium caperatum and Canningia sp. along with associated dinoflagellate cysts. The significant assemblage of spore-pollen assemblage represented by Cicatricosisporites australiensis, Ceratosporites equalis, Gleicheniidites circinidites, Contignisporites cooksonii, Microcachryidites antarcticus, Podosporites tripakshii and Callialasporites trilobatus has also been recorded. The Early Cretaceous sediments are regarded as Bamangaon Formation in Dhansiri Valley. The occurrence of dinoflagellate cysts suggests marginal marine environment for Bamangaon Formation deposited during the Early Cretaceous period corresponding to the Rift Phase. The Formation overlies the Metamorphic Basement Complex, and it is unconformably overlain by the sediments of Tura Formation of Ypresian (Early Eocene) age, deposited under subtidal to inner shelf environment during the Passive Margin Tectonic Phase. Article in Journal/Newspaper Antarc* antarcticus SAGE Publications Journal of the Palaeontological Society of India 68 2 199 206 |
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English |
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Paleontology |
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Paleontology Geddada, Divya Narsimha, Kanchi Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
topic_facet |
Paleontology |
description |
A palynological study on subsurface Early Cretaceous sediments (1550–1860 m) in well JM-A located in Dhansiri Valley, Upper Assam Shelf has been carried out for determination of age and depositional environment. The palynological investigations resulted into the identification of the characteristic and diversified occurrence of Early Cretaceous dinoflagellate cysts comprising Batioladinium micropodum, Achomosphaera? neptuni, Batiacasphaera asperata, Lagenorhytis sp. cf. L. delicatula, Mendicodinium caperatum and Canningia sp. along with associated dinoflagellate cysts. The significant assemblage of spore-pollen assemblage represented by Cicatricosisporites australiensis, Ceratosporites equalis, Gleicheniidites circinidites, Contignisporites cooksonii, Microcachryidites antarcticus, Podosporites tripakshii and Callialasporites trilobatus has also been recorded. The Early Cretaceous sediments are regarded as Bamangaon Formation in Dhansiri Valley. The occurrence of dinoflagellate cysts suggests marginal marine environment for Bamangaon Formation deposited during the Early Cretaceous period corresponding to the Rift Phase. The Formation overlies the Metamorphic Basement Complex, and it is unconformably overlain by the sediments of Tura Formation of Ypresian (Early Eocene) age, deposited under subtidal to inner shelf environment during the Passive Margin Tectonic Phase. |
format |
Article in Journal/Newspaper |
author |
Geddada, Divya Narsimha, Kanchi |
author_facet |
Geddada, Divya Narsimha, Kanchi |
author_sort |
Geddada, Divya |
title |
Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
title_short |
Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
title_full |
Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
title_fullStr |
Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
title_full_unstemmed |
Record of Early Cretaceous dinoflagellate cysts from well JM-A, Dhansiri Valley of Upper Assam Shelf, India |
title_sort |
record of early cretaceous dinoflagellate cysts from well jm-a, dhansiri valley of upper assam shelf, india |
publisher |
SAGE Publications |
publishDate |
2023 |
url |
http://dx.doi.org/10.1177/05529360231219329 http://journals.sagepub.com/doi/pdf/10.1177/05529360231219329 http://journals.sagepub.com/doi/full-xml/10.1177/05529360231219329 |
genre |
Antarc* antarcticus |
genre_facet |
Antarc* antarcticus |
op_source |
Journal of the Palaeontological Society of India volume 68, issue 2, page 199-206 ISSN 0552-9360 2753-7269 |
op_rights |
https://creativecommons.org/licenses/by-nc/4.0/ |
op_doi |
https://doi.org/10.1177/05529360231219329 |
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Journal of the Palaeontological Society of India |
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68 |
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2 |
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199 |
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206 |
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