Browsing by Author "Deo Brat Pathak"

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A new ammonite Geticeras gen. nov. from the Lower Valanginian (Lower Cretaceous) of the Spiti Valley, Tethys Himalaya, India
(Wadia Institute of Himalayan Geology, 2018) Bindhyachal Pandey; Deo Brat Pathak; Anand Kumar Jaitly
A new neocomitin ammonite taxon Geticeras getensis gen. et sp. nov. is systematically described from the poorly fossiliferous part of the Giumal Formation exposed near the village Gete, Spiti Valley, Tethys Himalaya, India. The characteristic ribbing of Geticeras, particularly on ventro-lateral shoulder and its tabulate venter, distinguish it from other genera of the Subfamily Neocomitinae. Based on the recent documentation of the globally spread ammonite genus Olcostephanus Neumayr from the same stratigraphic section, an Early Valanginian age is assigned to Geticeras gen. nov. © 2018, Wadia Institute of Himalayan Geology. All rights reserved.
A new approach to the correlation of the Upper Kimmeridgian Beckeri Zone across the Tethyan Sea
(E. Schweizerbart'sche Verlagsbuchhandlung, 1996) Günter Schweigert; Jai Krishna; Bindhyachal Pandey; Deo Brat Pathak
Based on a preliminary attempt of high resolution subdivision of the Upper Kimmeridgian Beckeri Zone of Southern Germany into ammonite faunal horizons, and on recently collected ammonites from the Kachchh area (India), the lineage of the ammonite genus Hybonoticeras is outlined. In consequence it is now possible to make much more precise correlations around the Kimmeridgian/Tithonian boundary (Beckeri/Hybonotum Zones) all across the Tethyan realm and its adjacent areas (e. g. Submediterranean of Europe, Indo-East-African province, Mexico).
A Preliminary Evaluation on the Prospects of Hydrocarbon Potential in the Carbonaceous Shales of Spiti and Chikkim Formations, Tethys Himalaya, India
(Geological Society of India, 2018) Bindhyachal Pandey; Deo Brat Pathak; Neeraj Mathur; Anand K. Jaitly; Alok K. Singh; Prakash K. Singh
In the present investigation, an attempt has been made to explore the possibility of hydrocarbon prospects in the carbonaceous shale deposits of Spiti and Chikkim formations exposed in the Spiti valley of the Tethys Himalaya. Twenty samples, collected from successive levels of these litho-units, have been subjected to maceral analysis, Rock-Eval Pyrolysis and six samples to Fourier Transform Infra-red Spectroscopy (FTIR) and nuclear magnetic resonance (NMR) analyses. The study reveals the presence of mainly kerogen-III type of organic matter but some of the shale samples have shown a good amount of total organic carbon (TOC) to the tune of 3.19% which is sufficient to produce hydrocarbon. The results indicate the presence of methane occurring as free and fixed hydrocarbon in the shale samples. Few levels are especially rich in hydrocarbon. They have shown encouraging results with potential for generating liquid as well as lighter hydrocarbon. The data is also supported by the FTIR and NMR studies. © 2018, Geological Society of India.
Biostratigraphic implication of Olcostephanus Neumayr, 1875 (Ammonoidea) from the Lower Cretaceous Giumal Formation, Spiti Valley, Tethys Himalaya, India
(Academic Press, 2017) Bindhyachal Pandey; Deo Brat Pathak
The paper records new species of the ammonoid genus Olcostephanus Neumayr from the Lower Cretaceous Giumal Formation exposed near Gete village in the Spiti Valley (Himachal Himalaya), India. Olcostephanus is one of the most significant genera for intrabasinal to intercontinental bio-chronostratigraphic correlation in view of its episodic global expansion during the Valanginian. This is the first report of Olcostephanus (Olcostephanus) sakalavensis (Besairie), Olcostephanus (Olcostephanus) cf. salinarius Spath, Olcostephanus (Olcostephanus) cf. fascigerus Spath and Olcostephanus (Olcostephanus) sp. indet., from the Indian Cretaceous. Based on close resemblance with the well-known biostratigraphically precised Mediterranean and South American Olcostephanus species, the present taxa are placed in the Neocomites platycostatus Subzone of the Karakaschiceras inostranzewi Zone to the Saynoceras verrucosum Subzone of the Saynoceras verrucosum Zone interval of the Standard Tethyan Scheme developed in Mediterranean of Europe. A possible correlation with Olcostephanus bearing stratigraphic horizons of South Africa, Madagascar and Pakistan is also proposed. The findings also confirm a significant eustatic rise close to the lower/upper Valanginian boundary. © 2016 Elsevier Ltd
Calliphylloceras heterophylloides (Oppel, 1856) from the basalmost jurassic succession of Sadhara Dome, Kachchh, India
(Palaeontological Society Of India, 2014) Bindhyachal Pandey; Deo Brat Pathak; Jai Krishna
We record and illustrate a septate (85 mm D) Calliphylloceras heterophylloides (Oppel, 1856) from the basalmost sediments of Sadhara Dome near the eastern end of Goradongar, Patcham 'Island', Kachchh, India. This is the oldest ammonoid-bearing horizon of the exposed Mesozoic sediments in the Kachchh Basin. In view of the correlation of the Late Bajocian Leptosphinctes bed of Kaladongar to the base of bed 32 of our column which is about 164 m younger than the Calliphylloceras-bearing bed 2, the age of present Calliphylloceras-bearing horizon is suggested here as Early Bajocian or older.
Characterization of Dichotomoceras in the Oxfordian of Kachchh
(2009) Jai Krishna; Bindhyachal Pandey; Deo Brat Pathak
We report here the first Dichotomoceras of the Indian subcontinent at Kantkote (Wagad) in the proximal most exposed part of the Kachchh Basin. This is further addition to the significant enlargement of the Oxfordian ammonoid record made earlier (Krishna et al. 1994, 1995, 1998,2000). Near continuous presence of ammonoids has been recorded in ca 55 m thick succession, almost immediately above the Schilli Subzone, that was considered ammonoid devoid earlier. The ammonoid density, diversity and frequency in this just discovered ca 55 m thick column are much scarcer in comparison to the underlying 10 m thick ammonoid abundant Schilli Subzone. Examples of Dichotomoceras are determined almost throughout the said interval which in our preliminary taxonomic evaluation appear identical or close to D. rotoides (Ronch.), D. stenocycloides (Siem.), D. bifurcatus (Quenst.) and D. crassus Enay. It thus suggests the characterization of the Rotoides Subzone of the Transversarium Zone and the superjacent Bifurcatus Zone of the column at least up to the early Late Oxfordian. ©GEOL. SOC. INDIA.
Differentiation of the significant Late Valanginian (Early Cretaceous) transgressive event in the Spiti Himalaya, India
(2011) Deo Brat Pathak; Jai Krishna; Bindhyachal Pandey
Nearly continuous sedimentary succession of Early Cretaceous age has been long known in the Tethyan Himalayan belt without differentiation of the individual stages. We discuss here our just realised differentiation of a relatively thin well bedded sandstone interval with significant presence of the characteristic Late Valanginian-Early Hauterivian ammonoid genus Olcostephanus. It lies within a dominantly sandy succession with shale interbeds of Giumal Sandstone Formation, near Gate in Spiti Himalaya. This is the first stratigraphically precise record of Olcostephanus from the Cretaceous of India. It is here circumstantially age constrained to the Standard Tethyan Verrucosum Subzone Olcostephanus expansion event to the High Himalayan belt. © 2011 Elsevier Ltd.
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
Late Lower Kimmeridgian-Lower Tithonian Virgatosphinctins of India: Evolutionary succession and biogeographic implications
(1993) Jai Krishna; Deo Brat Pathak
A very significant late Lower Kimmeridgian to Lower Tithonian virgatosphictin ammonoid fauna is examined under the rigorest possible stratigraphic precision at Ler-Katrol (Kachchh), India for evolutionary succession and biogeographic implications. The study allows the recognition of at least 12 successive faunas which have been organised into 8 zones and 12 subzones along with their relative precise correlations with Western Tethys. The principal single lineage worked out is Torquatisphinctes intermedius (Alterneplicatus Zone to Acanthicum Zone)-Pachysphinctes bathyplocus (Bathyplocus Zone)-Katroliceras katrolensis (Katrolensis Zone) (up to close of Kimmeridgian)-K. pottingeri (Pottingeri Zone). K. pottingeri in turn gives origin by cladogenesis to two short lived lineages, which include new species one in each lineage marking the termination of the stock at the close of Lower Tithonian with a probable lineage discontinuity in the basal Tithonian Hybonotum Zone. Among the other salient features are: 1. There is a major stratigraphic break at the base (=Vail's subcycles LZA 4.3-4.4). The start of the fauna corresponds to the eustatic rise of LZA 4.5, while the termination of the lineage is correlated with the termination of LZB 1.1. 2. K. pottingeri, known widely in the Indo-East-African province, is precisely dated for the first time as post-Hybonotum Zone, in association of very significant although also not well dated Himalayan Aulacosphinctoides (A. uhligi, A. willisi, A. tibetanus etc.). Aulacosphinctoides in the section is also found older than Virgatosphinctes. 3. The rare presence of non-virgatosphinctin West Tethyan species indicates expansion events related to eustatic rises, which permits correlation with the Western Tethys of the otherwise near endemic Indian faunas. Nothing is found in common with the SE. Pacific faunas, suggesting continued absence of a direct marine connection via the east and south coastal region of Africa. © 1993.
Late Tithonian (Late Jurassic) palynological record from the Jaisalmer Basin (India)
(Taylor and Francis Ltd., 2025) Raj Kumar; Bindhyachal Pandey; Neelam Das; Neha Aggarwal; Srikanta Murthy; Krishna Kumar; Deo Brat Pathak
Late Tithonian (Late Jurassic) palaeobotanical records from the Jaisalmer Basin are infrequent. We report the first record of an age-diagnostic palynological assemblage of the sedimentary rocks in the Bhadasar Formation from the Jaisalmer Basin, India. The study is carried out to consider the palaeoenvironmental settings in this basin based on palynological and palynofacies investigations. A well-preserved assemblage of palynomorphs with 22 species belonging to 10 genera, including spores and pollen. The palynological assemblage is characterised by the dominance of coniferous pollen of Callialasporites spp. Araucariacites spp. along with some significant taxa viz. Cupressacites ramachandra, Microcachryidites antarcticus, Classopollis sp. Podocarpidites sp. Pityosporites sp. Ginkgoretectina spp. and Monosulcites sp. which suggest a Late Tithonian (Late Jurassic) age. The occurrence of conifer pollens (Araucariacites and Callialasporites) represents coastal vegetation and warm climate. However, some bisaccate pollen (Podocarpidites) indicates drier upland areas. Palynofacies records suggest two distinct Palynofacies Assemblages (PA–I and PA–II) correspond to the marginal oxic to dysoxic basin and the shelf to marginal transition. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
Late Tithonian (Late Jurassic) palynological record from the Jaisalmer Basin (India)
(Taylor and Francis Ltd., 2024) Raj Kumar; Bindhyachal Pandey; Neelam Das; Neha Aggarwal; Srikanta Murthy; Krishna Kumar; Deo Brat Pathak
Late Tithonian (Late Jurassic) palaeobotanical records from the Jaisalmer Basin are infrequent. We report the first record of an age-diagnostic palynological assemblage of the sedimentary rocks in the Bhadasar Formation from the Jaisalmer Basin, India. The study is carried out to consider the palaeoenvironmental settings in this basin based on palynological and palynofacies investigations. A well-preserved assemblage of palynomorphs with 22 species belonging to 10 genera, including spores and pollen. The palynological assemblage is characterised by the dominance of coniferous pollen of Callialasporites spp. Araucariacites spp. along with some significant taxa viz. Cupressacites ramachandra, Microcachryidites antarcticus, Classopollis sp. Podocarpidites sp. Pityosporites sp. Ginkgoretectina spp. and Monosulcites sp. which suggest a Late Tithonian (Late Jurassic) age. The occurrence of conifer pollens (Araucariacites and Callialasporites) represents coastal vegetation and warm climate. However, some bisaccate pollen (Podocarpidites) indicates drier upland areas. Palynofacies records suggest two distinct Palynofacies Assemblages (PA–I and PA–II) correspond to the marginal oxic to dysoxic basin and the shelf to marginal transition. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
New Ammonoid evidence for theJurassic/Cretaceous boundary in Kachchh Western India, and long distance correlation with Southern Europe
(1994) Jai Krishna; Deo Brat Pathak; Bindhyachal Pandey
The Jurassic/Cretaceous boundary in the ammonoid rich classic Jurassic region of Kachchh could not be precisedfor well over a century (1871-1991) due to the absence of ammonoids or other guide fossils of the Berriasian. Our present studies now firmly establish the basal Berriasian in Kachchh through close or identical ammonoids Aspidoceras cf. taverai Checa,, Argentiniceras loncochensis (Steur)), Spiticeras cf. ducale (Matheron)) and Berriasella sp. Relatively, among these, A. taverai Checa is considered a good marker of the basal Berriasian Jacobi Zone in the Subbetic Spain. Besides precising the Jurassic/Cretaceous boundary in Kachchh, A. cf. taverai Checa also allows long distance correlation to the precision of a single ammonoid zone across the Tethys between Kachchh (Indo-East-African province) on the south/east margin of the Tethys and Spain (Mediterranean province) on the north/west margin of the Tethys. The episodic presence of the ubiquitous Tethyan Aspidoceras in Kachchh during the Upper Kimmeridgian and basal Berriasian, interestingly, is found to correspond with phases of the eustatic rise of the Vail Cycles LZA 4.6 and LZB 1.4 which in turn suggests significant ammonoid faunal expansion events during the said intervals towards South and East from the Mediterranean to the Indo-East-African province. © 1994.
Preliminary remarks on new ammonoid collection from freshly exposed succession of the Spiti Formation between Lidang and Giumal, Spiti Valley, Himachal Himalaya, India
(2013) Bindhyachal Pandey; Deo Brat Pathak; Jai Krishna
The present contribution embodies the preliminary analysis of ammonoids collected from 19 successive levels of a freshly cut ~ 92 m thick succession of the Spiti Formation exposed along a newly constructed motorable road linking the villages Lidang and Giumal in the Spiti Valley. Ammonoids are found present throughout the succession. The preliminary taxonomic determination of over 125 ammonoid specimens registers the identification of 10 families/subfamilies and 18 genera ranging in age from Late Kimmeridgian to Late Tithonian (Late Jurassic). The generic range chart allows the differentiation of four distinct ammonoid assemblages - Pachysphinctes Assemblage (Late Kimmeridgian), Aulacosphinctoides Assemblage (basal Tithonian), Virgatosphinctes Assemblage (Early Tithonian) and Himalayites Assemblage (Late Tithonian) enabling tentative demarcation of the Kimmeridgian/Tithonian Stage boundary and Early/Late Tithonian Substage boundary. These four ammonoid assemblages are correlated with known areas of the Indian subcontinent as also with the Standard Tethyan Scheme developed in Europe.
Record of Tethyan gastropod genus Astrohelix Szabó, 1984 from late Bajocian (Middle Jurassic) of Kachchh, western India
(2012) Bindhyachal Pandey; Deo Brat Pathak; Anand K. Jaitly; Jai Krishna; M. Venkateshwarlu
We here present the first record and illustrate the planispiral gastropod genus Astrohelix Szabo, 1984 through its species Astrohelix (Bifldobasis) cf. hourcqui (Delpey, 1948) from the Late Bajocian (Middle Jurassic) sediments of Kachchh Mainland, western India.
Status of the indian early cretaceous ammonoid record in light of recent observations in the spiti valley, Himachal Himalaya
(Wadia Institute of Himalayan Geology, 2015) Bindhyachal Pandey; Deo Brat Pathak
The present contribution enlightens the current understanding of the Early Cretaceous ammonoid record in India. Our recent work in the Spiti Valley suggests that the ammonoid bearing Early Cretaceous succession in the Spiti Himalaya, the Giumal Formation is ideal to carry out ammonoid based biostratigraphic studies. In view of the record of the ammonoid genera Odontodiscoceras and Berriasella from the basal sandstone bed and Colombiceras, Deshayesites, Cleoniceras and Australiceras from the upper most sandstone beds, the age of the Giumal Formation is précised to range from Berriasian to Early Aptian. The preliminary study of the freshly collected ammonoids suggests that the bases of the Berriasian, Valanginian and Aptian stages of the Early Cretaceous are marked, respectively, through the first appearances of the genera Odontodiscoceras, Olcostephanus and Cleoniceras. The succession is important for initiation of a new approach towards the recognition of Oceanic Anoxic Events, not attempted so far. © 2014 by the Wadia Institute of Himalayan Geology, Dehradun 248001, India.
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.
The possibility of the Oceanic Anoxic Events (OAEs) study in the Indian marine Jurassic - Cretaceous outcrops
(Geological Society of India, 2016) Bindhyachal Pandey; Deo Brat Pathak
[No abstract available]