Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Protoconch Size of Lepidocyclina (Nephrolepidina) - A Potential Palaeoclimatic Indicator


Affiliations
1 Department of Earth Sciences, Indian Institute of Technology, Powai, Bombay 400 076
2 Department of Earth Sciences, Indian Institute of Technology, Powai, Bombay 400 076, India
 

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Analysis of an Indo-Pacific species, Lepidocyclina (Nephrolepidina) sumatrensis shows that the protoconch diameter varies with latitude. The data plotted on the reconstructed continental positions for the Miocene epoch shows that forms away from the equator are characterised by progressively larger protoconch diameter. An average value of protoconch diameter >200μ is seen to occur from 15° to 30° latitude while those with <200μ are confined within 15° latitude. This observation can have potential use in inferring the climate of the geological past.
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  • Protoconch Size of Lepidocyclina (Nephrolepidina) - A Potential Palaeoclimatic Indicator

Abstract Views: 187  |  PDF Views: 126

Authors

Pratul Kumar Saraswati
Department of Earth Sciences, Indian Institute of Technology, Powai, Bombay 400 076
Arun Kumar
Department of Earth Sciences, Indian Institute of Technology, Powai, Bombay 400 076, India

Abstract


Analysis of an Indo-Pacific species, Lepidocyclina (Nephrolepidina) sumatrensis shows that the protoconch diameter varies with latitude. The data plotted on the reconstructed continental positions for the Miocene epoch shows that forms away from the equator are characterised by progressively larger protoconch diameter. An average value of protoconch diameter >200μ is seen to occur from 15° to 30° latitude while those with <200μ are confined within 15° latitude. This observation can have potential use in inferring the climate of the geological past.