Papers by Dhirendra Kumar Pandey
Palaeontologische Zeitschrift, 2002
Elf Exemplare der KoralleCyathophora Michelin, 1843, bekannt aus dem Oberjura und der Kreide, wur... more Elf Exemplare der KoralleCyathophora Michelin, 1843, bekannt aus dem Oberjura und der Kreide, wurden im Mitteljura (Bajoc) des Beckens von Kachchh, westliches Indien, gefunden. Sie stammen aus dem Babia Cliff Sandstone member der Kaladongar Formation, die entlang des nördlichen Abbruchs von Kala Dongar auf Pachchham Island aufgeschlossen ist. Die Exemplare werden als die ältesten jurassischen Vertreter der Familie CyathophoridaeVaughan &Wells, 1943 beschrieben und abgebildet. Das monospezifische Auftreten vonCyathophora geht vermutlich auf Schwankungen im Salzgehalt des randlich marinen Ablagerungsraumes zurück. Cyathophora Michelin, 1843, hitherto well known from the Upper Jurassic and Cretaceous, has been found in the Middle Jurassic (Bajocian) of the Kachchh Basin, western India. Eleven specimens ofCyathophora bourgueti (Defrance, 1826) from the Babia Cliff Sandstone member of the Kaladongar Formation, exposed along the northern scarp of the Kala Dongar, Pachchham Island, Kachchh, are described and illustrated as the earliest Jurassic record of the family CyathophoridaeVaughan & Wells, 1943. It is suggested that the monospecific occurrence ofCyathophora bourgueti was controlled by salinity.
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Science in China Series D: Earth Sciences, 2009
The Kachchh Basin and the Jaisalmer Basin are two neighboring Mesozoic sedimentary basins at the ... more The Kachchh Basin and the Jaisalmer Basin are two neighboring Mesozoic sedimentary basins at the western margin of the Indian craton. The Jurassic succession of the Kachchh Basin is more complete and more fossiliferous than that of the Jaisalmer Basin. Consequently, intrabasinal correlation of the sedimentary units has been possible in the Kachchh Basin, but not in the Jaisalmer Basin. However, some marker beds existing in the Kachchh Basin can be recognized also in the Jaisalmer Basin. Ammonite evidence shows that they are time-equivalent. The following four units form marker intervals in both basins: (1) the pebbly rudstone unit with Isastrea bernardiana and Leptosphinctes of the Kaladongar Formation (Kachchh Basin) and the Isastrea bernardiana-bearing rudstone of the Jaisalmer Formation (Jaisalmer Basin) both represent transgressive systems tract deposits dated as Late Bajocian; (2) bioturbated micrites with anomalodesmatan bivalves within the Goradongar Yellow Flagstone Member (Kachchh Basin) and bioturbated units in the Fort Member (Jaisalmer Basin) represent maximum flooding zone deposits of the Middle to Late Bathonian; (3) trough-crossbedded, sandy pack- to grainstones of the Raimalro Limestone Member (Kachchh Basin) and the basal limestone-sandstone unit of the Kuldhar section of the Jaisalmer Formation (Jaisalmer Basin) correspond to Late Bathonain transgressive systems tract deposits; and (4) ferruginous ooid-bearing carbonates with hardgrounds of the Dhosa Oolite member (Kachchh Basin) and the middle part of the Jajiya Member (Jaisalmer Basin) are Oxfordian transgressive systems tract deposits. The fact that in both basins similar biofacies prevailed during certain time intervals demonstrates a common control of their depositional history. As the two basins represent different tectonic settings, the most likely controlling factors were the relative sea-level changes produced by eustatic processes, a common subsidence history of the northwestern margin of the Indian craton, and the paleoclimate.
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Palaeontologische Zeitschrift, 1996
Two specimens of the Middle Jurassic ammonite genusReineckeia (sensu lato) have been found in the... more Two specimens of the Middle Jurassic ammonite genusReineckeia (sensu lato) have been found in the lowest beds of the Pachchham (Patcham) Limestones exposed in the core of the Jumara Dome, Kachchh (Kutch), Gujarat, western India. The stratigraphy is described in detail and the age bracketed to lie between latest Late Bathonian and Middle Bathonian, older than any previously described examples of this genus, either in India or in Europe (middle Early Callovian). The new finds are compared with other known pre-Callovian Reineckeiidae, notably those of the eastern borders of the Pacific, but the relationships are not close. The phylogenetic consequences are briefly discussed. The roots of the Reineckeiidae continue to lie hidden. Zwei Exemplare der mitteljurassischen AmmonitengattungReineckeia (sensu lato) wurden aus den untersten Schichten der Pachchham (Patcham) Limestones geborgen, die im Kern des Jumara Dome von Kachchh (Kutch), Gujarat, westliches Indien, aufgeschlossen sind. Die Stratigraphie dieser Schichten wird im Detail beschrieben. Das Alter der beiden Exemplare kann auf den Zeitraum zwischen dem spätesten Ober-Bathon und dem Mittel-Bathon eingegrenzt werden. Damit sind sie älter als alle anderen bekannten Funde der Gattung, ob aus Indien oder Europa (mittleres Unter-Bathon). Die neuen Funde werden mit anderen Reineckeiiden aus dem Prä-Callov verglichen, vor allem mit Formen vom Ostrand des Pazifiks, die jedoch keine engen Beziehungen aufweisen. Die Schlußfolgerungen für die Phylogenie der Gruppe werden kurz diskutiert. Die Wurzeln der Reineckeiidae liegen nach wie vor im Dunkeln.
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Palaeontologische Zeitschrift, 2006
Fragmentary isolated remains of large (up to 20 m or more) sauropods from the Middle Jurassic (Ba... more Fragmentary isolated remains of large (up to 20 m or more) sauropods from the Middle Jurassic (Bajocian) Khadir Formation of Khadir Island (Kachchh, W India) are described and compared in detail. Three of the bone fragments (a metacarpal, a first pedal claw and a fibula) can be assigned with confidence to the Camarasauromorpha and represent the oldest known record of that derived dinosaur group. The new finds from western India further close a temporal and geographical gap in our knowledge of sauropods and contribute to understanding their early phylogeny. Isolierte Überreste eines großen (bis zu 20 m oder mehr langen) Sauropoden werden aus der mitteljurassischen (Bajocium) Khadir Formation auf Khadir Island (Kachchh, W Indien) beschrieben und detailliert verglichen. Drei der Knochenfragmente (ein Metacarpale, eine erste Fußklaue und eine Fibula) können mit Sicherheit einem Vertreter der Camarasauromorpha zugeordnet werden und repräsentieren damit den ältesten Nachweis dieser abgeleiteten Dinosaurier-Gruppe. Die neuen Funde aus dem westlichen Indien schließen eine zeitliche und geographische Lücke in unserer Kenntnis der Sauropoden und tragen zum Verständnis ihrer frühen Phylogenie bei.
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Palaeogeography Palaeoclimatology Palaeoecology, 1999
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Palaeogeography Palaeoclimatology Palaeoecology, 2003
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Palaeontologische Zeitschrift, 1994
Der heteromorphe AmmonitParapatoceras tuberculatum (Baugier & SauzÉe 1843), bislang bekannt aus d... more Der heteromorphe AmmonitParapatoceras tuberculatum (Baugier & SauzÉe 1843), bislang bekannt aus dem Untercallov von Europa, wird aus den Macrocephalen-Schichten (Untercallov) der Pachchham „Insel“ von Kachchh, westliches Indien beschrieben. The ammoniteParapatoceras tuberculatum (Baugier & SauzÉ 1843), hitherto known from the Early Callovian of Europe, is described from the Early Callovian “Macrocephalus Beds” of Pachchham Island of Kachchh, western India.
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Journal of The Geological Society of India, 2009
The lithostratigraphy, depositional environment and age of the Marwar Supergroup have been review... more The lithostratigraphy, depositional environment and age of the Marwar Supergroup have been reviewed in the light of report of δ13C depletion recorded in the carbonates of the Bilara Group (middle part of Marwar Supergroup) and discovery of trilobite-like trace fossils from the ·Red bedsŽ of Nagaur Group (upper part of Marwar Supergroup). The δ13C depletion observed in Bilara carbonates is not a result of glaciation rather due to rapid burial and poor water circulation in the low energy water of the protected basin. Secondly, the trace fossils are, in fact, traces of notostracan crustaceans found in shallow fluvial and shallow lacustrine environment. The present paper also records a spiral, burrowing trace-fossil, possibly Gyrolithes, from a cross-bedded sandstone of the Jodhpur Group.
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Papers by Dhirendra Kumar Pandey