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Patnaik, Rajeev
- Micromammal-Based Palaeoenvironment of Upper Siwaliks Exposed Near Village Saketi, H. P.
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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 46, No 4 (1995), Pagination: 429-437Abstract
Two sections, namely Kanthro and Moginand exposing Upper Siwalik rocks near village Saketi (H.P., India) have yielded a diverse fossil assemblage and evidence for pedogenic modifications. Palaeoecological reconstruction indicates the presence of atleast four palaeocommunities (pond, pondbank, bushland and grassland). Studies concerning taphonomy reveals that there was a gradual accumulation of micro and megafossil remains in shallow seasonal ponds of broad flood plains. It is also noticed that the concentration of some small mammal remains were due to biogenic processes.Keywords
Palaeoecology, Pedogenesis, Micromammals, Siwaliks, Himachal Pradesh
- A Fossil Palm Leaf Impression from ∼11.2 Ma Old, Siwalik Deposits of Kangra Valley, Himachal Pradesh
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Authors
Affiliations
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh - 160 014, IN
1 Centre of Advanced Study in Geology, Panjab University, Chandigarh - 160 014, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 1 (2012), Pagination: 85-88Abstract
We report here, a fossil palm leaf from Lower Siwalik sediments, tied to nearby palaeomagnetically dated 11.2 Ma old beds exposed in the Baner Khad, near Ranital, Himachal Pradesh. The palm fossil leaf impression has been placed in the genus Palmacites sp. (Family: Arecaceae) based on its diagnostic features such as large palmate leaf without hastula and costa (midrib), showing coriaceous texture, leaflets diverging from the base of the lamina with prominent midrib and parallel venation. This finding may indicate presence of tropical to subtropical climatic conditions in the Himalayan foothills around Kangra Valley in the Middle Miocene time.Keywords
Palm Leaf, Siwaliks, Kangra, Himachal Pradesh.References
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- High Resolution Climatic Record Entombed in Fossil Hominid Dental Enamel
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Authors
Affiliations
1 Center for Advanced Study in Geology, Panjab University, Chandigarh, IN
1 Center for Advanced Study in Geology, Panjab University, Chandigarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 540-540Abstract
Global climate has fluctuated drastically since the Late Miocene, causing an overall cooling, drying, fragmentation of rainforests, occurrence of glacial-interglacial cycles, draughts-floods, effecting tropical Africa and Asia. We humans, apes and our extinct ancestors, grouped together in a family called hominidae, have evolved in response to these climatic fluctuations, by continuously adapting to changing ecological conditions. Therefore, like other terrestrial proxies such as tree rings, palaeosols, speleothemes, fluvio-lacustrine sediments, peat deposits, microfossils, magnetic minerals and plant phytoliths, hominid dental enamel is a potential archive for high resolution palaeoclimate studies. Hominid dental enamel grows periodically in a rhythemic manner producing daily increments known as cross striations. Incremental lines of longer duration comprising on an average 7-9 cross striations are termed as Retzius lines.Full Text