Uranium thorium dating on corals
Continuous 500,000-year climate record from vein calcite in Devils Hole, Nevada. Mass spectrometric techniques for the measurement of Th and U have been developed.FANALE and SCHAEFFER (1965) determined He/U ages of corals and other aragonitic fossils and found that the results generally agreed with independent age estimates.
Again, please keep their identity a secret Click on the "Continue" button search with your zip/postal code.U at the time of sample formation must be known or calculated. With time, Thorium 230 accumulates in the sample through radiometric decay. Analyses of a number of corals that grew during the last interglacial period yield ages of 122 to 130 ky. The ages are similar but analytically distinguishable.The ages coincide with or slightly postdate the summer solar insolation high at 65N latitude, which occurred 128 ky ago. The difference may be due to erosion of the outer, younger, portion of the latter coral head.