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Kumar, Pramod
- Palynology of Carbonaceous Clays of Nimar Formation, Jhabua District, Madhya Pradesh, India
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Authors
Affiliations
1 Birbal Sahni Institute of Palaeobotany, Lucknow-226 007, IN
1 Birbal Sahni Institute of Palaeobotany, Lucknow-226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 6 (1994), Pagination: 671-674Abstract
Carbonaceous clays of Nimar Formation, exposed near Umrali village in Jhabua District, Madhya Pradesh have been palynologically analysed. The palynoflora dominated by the pollen of conifers compares favourably with Jabalpur, Rajmahal, Vemavaram/Raghavapuram and Bhuj palynoassemblages. Due to nonavailability of Early Cretaceous palynofossils, the assemblage is dated as Late Jurassic.The palynoflora points towards prevalence of fresh water, warm humid, swampy conditions during the deposition of the Carbonaceous clays of Nimar Formation.
Keywords
Palynology, Palaeoclimate, Nimar Formation, Jurassic, Madhya Pradesh.
- Early Miocene Shell Concentration in the Mixed Carbonate-Siliciclastic System of Kutch and their Distribution in Sequence Stratigraphic Framework
Abstract Views :192 |
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Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai - 400 076, IN
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai - 400 076, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 4 (2009), Pagination: 432-444Abstract
The Early Miocene succession of Kutch represents a mixed carbonate-siliciclastic depositional system. The carbonate part of the succession, characterized by high abundance of shallow marine benthic fauna, hosts typical shell concentrations (also referred as shell beds). The thickness of shell concentrations vary in scale from 5 cm to 100 cm and are separated by poorly fossiliferous to barren silty shales/siltstones. Based on taphonomic and sedimentological observations, shell concentrations are classified as lag, event, composite/multi-event and hiatal types. The occurrence of different types of shell concentrations in the background of sequence stratigraphic framework is the main theme for the present study. Overall, the shell concentrations occupy the middle part of the sequence i.e. upper part of the transgressive systems tract and lower part of the highstand systems tract. Lag concentrations are found in the lower part of the sequence while composite concentrations, the major contributors in the sequence, occur in upper part of the transgressive systems tract and in the lower part of the highstand systems tract. The hiatal concentrations are associated with maximum flooding surface while the position of event concentrations is independent of sequence stratigraphic framework. The shell concentrations occupy marine flooding surface or marine ravinement surface, thus mark parasequence boundaries.Keywords
Shell Concentration, Mixed Carbonate-Siliciclastic System, Systems Tract, Early Miocene, Kutch, Gujarat.References
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