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Mehrotra, R. C.
- Megaremains from the Siwalik Sediments of West and East Kameng Districts, Arunachal Pradesh
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Authors
Affiliations
1 Project Himalayan Geology, Geological Survey of India, Sector E, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007
1 Project Himalayan Geology, Geological Survey of India, Sector E, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1256-1266Abstract
The present fossil material comprising both dicotyledonous and monocotyledonous leaf impressions, was collected from the Siwalik sediments of West and East Kameng districts, Arunachal Pradesh, India. The distribution of the modern comparable forms of the fossils suggests that the flora was typically tropical indicating the prevalence of a warm and humid climate in the region during the Mio-Pliocene.Keywords
Leaf impressions, Siwalik, Mio-Pliocene, Palaeoecology, West and East Kameng districts, Arunachal Pradesh.
- Animal Remains from the Bhuban formation of the Lunglei District, Mizoram
Abstract Views :184 |
PDF Views:182
Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
2 Departmenotf Geology, Kumaun University, Nainital - 263 002,, IN
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
2 Departmenotf Geology, Kumaun University, Nainital - 263 002,, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 5 (2005), Pagination: 624-628Abstract
No Abstract.Full Text
- Plant Remains from the Upper Siwalik Sediments of West Kameng District, Arunachal Pradesh
Abstract Views :181 |
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Authors
Affiliations
1 Geological Survey of India, Lucknow, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
3 Indian School of Mines, Dhanbad, IN
4 Tcntulbena, Kolkata, IN
1 Geological Survey of India, Lucknow, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, IN
3 Indian School of Mines, Dhanbad, IN
4 Tcntulbena, Kolkata, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 3 (2003), Pagination: 319-324Abstract
Three subdivisions of Siwalik, vi/ , Lower, Middle and Upper are exposed m reverse stratigraphtc order in the Kameng District of Arunachal Pradesh. A rich assemblage of plant fossils is present in the Siwalik Group of rocks. The megaplant remains including one leaf compression and cuticular fragment from the Upper Siwalik of the West Kameng District have been described. The leaf compression shows its affinities with Termmaha catappa of Combretaceae whereas the cuticular fragment is assignable to Pihpancittis Roselt and Schneider and has been described as a new species named P arunachalensis sp nov. The presence of T calappcns very significant as it points to coastal depositional environment.Keywords
Leaf Compression, Cuticular Fragment, Termmaha Catappa, Upper Pliocene-Pleistocene, Siwalik Group, West Kameng District, Arunachal Pradesh.- A Thelypteridaceous Fossil Fern from the Lower Siwalik of the East Kameng District, Arunachal Pradesh, India
Abstract Views :208 |
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Authors
Affiliations
1 Geological Survey of India, Sector E, Himalayan Geology Division, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow -226 007, IN
1 Geological Survey of India, Sector E, Himalayan Geology Division, Aliganj, Lucknow - 226 024, IN
2 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow -226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 4 (2003), Pagination: 483-486Abstract
No Abstract.Full Text
- New Legume Fruits from the Oligocene Sediments of Assam
Abstract Views :186 |
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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
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 75, No 6 (2010), Pagination: 820-828Abstract
For the first time a rich assemblage of legume fruits is described from the Late Oligocene sediments of the Makum as well as Dilli-Jeypore coalfields of Assam. A new genus Buteocarpon has been instituted for the fossil fruits resembling Butea Roxb. of the family Fabaceae. In addition, six new species of the genus Leguminocarpon Goeppert are also described. Their presence indicates a warm and humid climate in the region during the deposition of the sediments.Keywords
Fabaceae, Late Oligocene, Butea, Leguminocarpon, Palaeoecology, Assam.- Early Eocene (∼50 M. Y.) Legume Fruits from Rajasthan
Abstract Views :232 |
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 111, No 3 (2016), Pagination: 465-467Abstract
The early Eocene (55-52 Ma) is one of the most biologically diverse intervals associated with extensive migration of biota from one land to another in the earth's history. This epoch has witnessed exceptionally warm temperature recorded in global deep marine environments, though Shukla et. al. have recently suggested cooler early Eocene temperature regime for the terrestrial biome on the basis of CLAMP analysis. The north-moving Indian subcontinent is said to be subducted beneath the Eurasian plate at this juncture, and the biota of each land mass marked its own way to move far and wide. To study these changes in deep time we have collected several plant fossils from the Gurha lignite mine (27.87398°N, 72.86709°E) in Rajasthan. Our collection contains several legume (family Fabaceae) fruits of which two are systematically described here.Full Text
- Quantification of Rainfall during the Late Miocene–Early Pliocene in North East India
Abstract Views :257 |
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
2 Dr H. S. Gour Vishwavidyalaya, Sagar 470 003, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
2 Dr H. S. Gour Vishwavidyalaya, Sagar 470 003, IN
Source
Current Science, Vol 113, No 12 (2017), Pagination: 2253-2257Abstract
The monsoon rainfall contributes about 30% of the total global rainfall. The Asian monsoon system (ASM) is one of the largest systems and is of great significance in the global climate system. It consists of two subsystems, namely Indian summer monsoon (ISM)/southwest (SW) monsoon/South Asia summer monsoon (SASM) and East Asia monsoon (EAM).Full Text
References
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- Plant Remains from the Laisong Formation of Manipur
Abstract Views :176 |
PDF Views:0
Authors
Affiliations
1 Department of Geology, Imphal College, Imphal - 795 001, IN
2 Department of Earth Sciences, Manipur University, Imphal - 795 003, IN
3 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
1 Department of Geology, Imphal College, Imphal - 795 001, IN
2 Department of Earth Sciences, Manipur University, Imphal - 795 003, IN
3 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 3 (2012), Pagination: 287-294Abstract
Some plant remains are described from the Laisong Formation (Barail Group) of Thoubal and Senapati districts of Manipur. The flora is diverse comprising gymnospermous, monocotyledonous and dicotyledonous forms and indicates tropical to subtropical climate in the vicinity of the area during the deposition of the host rocks.Keywords
Gymnosperms, Arecaceae, Rosaceae, Eocene-Late Oligocene, Palaeoclimate.References
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- Pentamerous Fossil Flowers and Fruits from Rajasthan Reveals the Dominance of Flowering Plants in the Early Palaeogene of India
Abstract Views :58 |
PDF Views:42
Authors
Affiliations
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
1 Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, IN
Source
Current Science, Vol 125, No 3 (2023), Pagination: 321-324Abstract
The dominance of angiosperms, achieved around the late Cretaceous–early Palaeogene time, can be observed through multiple well-preserved fossil flowers and fruits described from the early Palaeogene sediments of Bikaner and Barmer (Rajasthan, India). Here, we report twelve pentamerous fossil flowers categorized into three morphotypes mainly based on their petal’s shape and pattern. Fossil pollen Rhoipites anacardioides Ramanujam, extracted from the preserved androecium of one of the fossil flowers, has shown strong affinity with the modern pollen of Anacardiaceae. The pentamerous fossil fruit encompassing a single whorl of five carpels alternating with petals is similar to the extinct genus Chaneya Wang and Manchester. These fossils provide a cinematic picture of the beautiful flowering and fruiting phases during the early Palaeogene, well known for the major diversification of angiosperms.Keywords
Angiosperm, Anacardiaceae, Chaneya, Palana Formation, Rutaceae.Full Text
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