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Coastal Response to Changes in Sea Level Since the Last 4500 BP On the East Coast of Tamil Nadu, India (2002)

Achyuthan, Hema ; Baker, V R

Cambridge University Press

In: Radiocarbon. 2002; 44(1): 137-144. Published 2002 Jan 01. doi: 10.1017/s0033822200064730.

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Publication Date: 2002-01-01

Description: Geomorphology, clay mineral composition, and radiocarbon dates from Muttukadu to Marakkanam estuaries and the tidal zone along the east coast of Tamil Nadu, India, have been used to reconstruct coastal evolution between approximately 4500 and 1100 B P. Formation of alternate oyster beds with intervening tidal clay units indicate fluctuation in the sea level may be a consequence of changes in the Mid-Holocene sedimentation pattern and coastal configuration. 14C dates from Muttukadu indicate a rapid relative sea-level rise (RSL) subsequent to 3500 BP and tidal flat sedimentation between 3475 and 3145 BP. Marine conditions along the east coast area returned around 1900 B P. Comparison of dates with other sites, e.g. Muttukadu, Mammallapuram, and Marakkanam, points toward short removal of marine conditions, ample sediment supplies in the tidal zones, and neotectonic activity. Reactivation of the north–south trending fault line occurred not earlier than approximately 1050 B P. Our study indicates that Middle to Late Holocene coastal sedimentation and the chronology of the tidal zone formation have been strongly influenced by local factors. These have provided considerable scope for internal reorganization with changing coastal processes.

Print ISSN: 0033-8222

Electronic ISSN: 1945-5755

Topics: Archaeology , Energy, Environment Protection, Nuclear Power Engineering , Geosciences

Published by Cambridge University Press

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National Physical Laboratory Radiocarbon Measurements IV (1966)

Callow, W. J. ; Baker, M. J. ; Hassall, Geraldine I.

Cambridge University Press

In: Radiocarbon. 1966; 8: 340-347. Published 1966 Jan 01. doi: 10.1017/s0033822200000205.

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Publication Date: 1966-01-01

Description: The following list comprises measurements made since those reported in NPL III and is complete to the end of November 1965.Ages are relative to A.D. 1950 and are calculated using a half-life of 5568 yr. The measurements, corrected for fractionation (quoted δC13 values are relative to the P.D.B. standard), are referred to 0.950 times the activity of the NBS oxalic acid as contemporary reference standard. The quoted uncertainty is one standard deviation derived from a proper combination of the parameter variances as described in detail in NPL III. These variances are those of the standard and background measurements over a rolling twenty week period, of the sample δC14 and δC13 measurements and of the de Vries effect (assumed to add an additional uncertainty equivalent to a standard deviation of 80 yr). Any uncertainty in the half-life has been excluded so that relative C14 ages may be correctly compared. Absolute age assessments, however, should be made using the accepted best value for the half-life and the appropriate uncertainty then included. If the net sample count rate is less than 4 times the standard error of the difference between the sample and background count rates, a lower limit to the age is reported corresponding to a net sample count rate of 4 times the standard error of this difference.

Print ISSN: 0033-8222

Electronic ISSN: 1945-5755

Topics: Archaeology , Energy, Environment Protection, Nuclear Power Engineering , Geosciences