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Bajpai, Sunil
- Cretaceous-Tertiary Boundary Events: The Fossil Vertebrate, Palaeomagnetic and Radiometric Evidence from Peninsular India
Abstract Views :219 |
PDF Views:2
Authors
Ashok Sahni
1,
Sunil Bajpai
1
Affiliations
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh 160014, IN
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh 160014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 5 (1988), Pagination: 382-396Abstract
Recent data based on microvertebrates and associated microfossils suggest that the Lameta and coeval formations of Peninsular India are younger (Maestrichtian) than ages previously assigned to them (Cenomanian-Turonian). Similarly, the Takli and their intertrappean correlatives in several localities have yielded dinosaurian elements indicating thereby a Cretaceous rather than Tertiary age. Furthermore, no exclusively Tertiary taxa has been recorded from these beds at Nagpur, Asifabad, Kachchh and adjoining areas. Samples collected for palaeomagnetic studies with reference to vertebrate-bearing horizons suggest that the Deccan basaltic activity was initiated in the Late Maestrichtian at the end of Lameta times. The major part of the eruption took place during the reversed magnetic chron, 29R, which encompasses the Cretaceous-Tertiary Boundary. Radiometric dates (K/Ar, 40Ar/39Ar) tend to cluster in a 60 m.y. 70 m.y. interval. The Deccan traps have been cited as a possible alternative source of Ir enrichment in comparison to the hypothesis which ascribes the anomalously high values of this element at the KTB to an extra-terrestrial impact. The gradual decline of dinosaurs as well as other marine plankton and benthos towards the close of the Cretaceous favours hypotheses that do not advocate 'instantaneous' global mass extinctions.
- Fossil Turtle Eggshells From Infratrappean Beds of Duddukuru, Andhra Pradesh
Abstract Views :181 |
PDF Views:174
Authors
Affiliations
1 Department of Earth Sciences University of Roorkee, Roorkee-247667, IN
2 Department of Geology, Bangalore University, Bangalore-560056, IN
3 Department of Geology, Panjab University, Chandigarh-160014, IN
1 Department of Earth Sciences University of Roorkee, Roorkee-247667, IN
2 Department of Geology, Bangalore University, Bangalore-560056, IN
3 Department of Geology, Panjab University, Chandigarh-160014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 2 (1997), Pagination: 209-213Abstract
Chelonian fossil eggshell fragments are reported from the Late Cretaceous Infratrappean beds near Duddukuru, West Godavari District, Andhra Pradesh.Full Text
- Birbal Sahni Institute of Palaeobotany, Lucknow
Abstract Views :288 |
PDF Views:86
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 108, No 5 (2015), Pagination: 797-799Abstract
This article highlights the findings of some of the major collaborative studies conducted by the staff of the Birbal Sahni Institute of Palaeobotany during 2014. The article provides a glimpse of ongoing research at BSIP in diverse fields under the umbrella of palaeosciences, such as the origin and evolution of biota, palaeobiogeography, deep time and Quaternary palaeoclimates and palaeocology, archaeobotany and dating.Keywords
Evolution, Palaeobiogeography, Palaeoclimate, Palaeoscience.Full Text
- Brainstorming Session on Out-of-India Hypothesis
Abstract Views :188 |
PDF Views:133
Authors
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 6 (2009), Pagination: 879-879Abstract
No Abstract.Full Text
- The Earliest Marine Transgression in Western India:New Insights from Calcareous Nannofossils from Lathi Formation, Jaisalmer Basin
Abstract Views :340 |
PDF Views:189
Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow 226 007, IN
2 Geological Survey of India, Jaipur 302 004, IN
1 Birbal Sahni Institute of Palaeosciences, 53, University Road, Lucknow 226 007, IN
2 Geological Survey of India, Jaipur 302 004, IN
Source
Current Science, Vol 111, No 10 (2016), Pagination: 1631-1639Abstract
We report the first record of an age-diagnostic, but depauperate assemblage of calcareous nannofossils, an exclusively marine phytoplankton group, from the Lathi Formation of Jaisalmer Basin, western India. The nannofossil evidence, precisely constrains the age of the Lathi Formation, traditionally considered to be a Bajocian (Middle Jurassic) continental deposit. Furthermore, the presence of several reworked nannofossil taxa of Pliensbachian, Toarcian and Aalenian ages suggests that the earliest epeiric sea transgressed western India during the Early Jurassic. Thick and luxuriant gymnosperm forests proliferated in the Jaisalmer Basin during this time. The presence of calcareous nannofossils in both the lower and upper members of the Lathi Formation (Odania and Thaiat members) points to intermittent coastal marine depositional environment.Keywords
Calcareous Nannofossils, Early-Middle Jurassic, Jaisalmer Basin, Lathi Formation.Full Text
References
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- Kadar, A. P., Crittenden, S. and Karam, K. A., Middle Jurassic to Early Cretaceous calcareous nannofossils from Onshore North Kuwait: A new record. GeoArabia, 18(2), Late Jurassic Early Cretaceous Evaporite–Siliciclastic systems of the Arabian Plate, Abstracts of the EAGE’s Fourth Arabian Plate Geology Workshop, Abu Dhabi, United Arab Emirates, 2012, pp. 216–219.
- Dera, G., Pellenard, P., Neige, P., Deconinck, J. F., Pueat, E. and Dommergues, J., Distribution of clay minerals in Early Jurassic Peritethyan seas: Palaeoclimatic significance inferred from multiproxy comparisons. Palaeogeogr., Palaeoclimatol., Palaeoecol., 2009, 271, 39–51.