Browsing by Author "Jai Prakash Gautam"

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Late Albian ammonites from the Cauvery Basin, south India
(Academic Press, 2019) Jai Prakash Gautam; Bindhyachal Pandey; Anand Kumar Jaitly; Deo Brat Pathak; Jens Lehmann; Deep Narayan Tiwari
A comprehensive taxonomic account of fourteen ammonite species from the upper Albian succession of the Cauvery Basin, south India is presented. They belong to the genera/subgenera Gaudryceras, Anagaudryceras, Tetragonites, Puzosia (Puzosia), Puzosia (Bhimaites), Desmoceras (Desmoceras), Desmoceras (Pseudouhligella), Stoliczkaia (Stoliczkaia) and the heteromorphs Anisoceras and Mariella. Most of these ammonite species are cosmopolitan and well-known, especially from the western margin of the Tethys. The additional value of this study in contrast to earlier studies is founded in the intensive bed-by-bed collection from a well-documented measured section. This allows to establish a first detailed range chart for the uppermost Albian of this region and to correlate the Cauvery Basin section with the upper Albian Mortoniceras perinflatum Zone-Arrhaphoceras briacensis Zone interval of the Standard Tethyan Scheme. © 2019
Recent development in the upper albian ammonoid stratigraphy of the cauvery basin, south india
(Wadia Institute of Himalayan Geology, 2025) Bindhyachal Pandey; Jai Prakash Gautam; Deep Narayan Tiwari; Anand Kumar Jaitly; Ashish Kumar Singh
This study leads to formulation of Puzosia (Puzosia) mayoriana Zone, Anagaudryceras kayei Zone and Mariella (Mariella) bergeri Zone in ascending order in the Upper Albian succession of the Cauvery Basin, south India. This endeavor incorporates ever achieved biostratigraphic refinement over the earlier works and precise differentiation of the Upper Albian succession belonging in part to the Karai Formation of the basin. The present study is based on the collection of diagnostic Upper Albian ammonoids from Karai and Odiyam stratigraphic sections of the Karai Formation. The youngest Mariella (Mariella) bergeri Zone is formulated for the relatively ammonoid rich upper part of the Upper Albian succession in the Odiyam Section. This zone is also recognized and retained in the Karai Section, however, this interval is poorly fossiliferous in the Karai Section. The above Upper Albian zones/subzones of the Cauvery Basin have been correlated with the Upper Albian standard ammonoid zonal framework and also with zonal framework of the Cauvery Basin developed by early workers. © 2025, Wadia Institute of Himalayan Geology. All rights reserved.
Record of the Middle Albian (Lower Cretaceous) ammonoids from the Cauvery Basin, southern India
(Taylor and Francis Ltd., 2022) Bindhyachal Pandey; Jai Prakash Gautam; Anand Kumar Jaitly; Deep Narayan Tiwari
The two Middle Albian index ammonoid species Hamites (Hamites) attenuatus and Hamites (Hamites) rectus are recorded for the first time from the Karai Formation in the Ariyalur Sub-basin of the Cauvery Basin. The part of succession under the present endeavour has yielded eight ammonoid specimens from four ammonoid levels which are systematically described in the Cauvery Basin. Biostratigraphic evaluation of these ammonoids enables the authors to formulate Hamites (Hamites) attenuatus Zone which is broadly correlatable to the Hoplites dentatus Zone–Euhoplites lautus Zone interval of the standard ammonoid zonal scheme. © 2021 Informa UK Limited, trading as Taylor & Francis Group.
The age of the Nodular Limestone Formation (Late Cretaceous), Narmada Basin, central India
(Springer, 2018) Susheel Kumar; Deo Brat Pathak; Bindhyachal Pandey; Anand Kumar Jaitly; Jai Prakash Gautam
The age of the marine Nodular Limestone Formation of the Bagh Group is refined at Substage level through ammonoid and inoceramid index taxa. The study is based on the fresh collections from three well-defined successive intervals (Lower Karondia, Upper Karondia and Chirakhan members) of this formation having excellent exposures in different localities of the Narmada Basin, central India. The first record of the widely distributed Turonian ammonoid genera Spathites Kummel and Decker and Collignoniceras Breistroffer from the Nodular Limestone Formation constrained its age exclusively to Turonian. The Early Turonian species Spathites (Jeanrogericeras) aff. revelieranus (Courtiller) and Mytiloides labiatus (Sclotheim) occur in the lower part, while the Middle Turonian marker Collignoniceras cf. carolinum (d’Obrbigny) and Inoceramus hobetsensis (Nagao and Matsumoto) occurs in the upper part of the Karondia Member. The record of the index species Inoceramus teshioensis (Nagao and Matsumoto) in association with Placenticeras mintoi Vredenburg from Chirakhan Member allows a definite Late Turonian age. The present contribution is an attempt to resolve the controversies in the age of the Nodular Limestone Formation and also demarcation of the three divisions (Early, Middle and Late) of the Turonian Stage in the Narmada Basin, central India. © 2018, Indian Academy of Sciences.