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To place these markers in the past, corals also prove particularly well suited.

Their calcium carbonate skeleton offers up the potential for carbon dating (up to 30-40,000 years), because it is 12% carbon.

Thus, the lead isotopic composition of any mineral or rock depends upon its age and the environment from which it was formed; that is, it would depend upon the ratio of uranium plus thorium to lead in the parent material.

Using trace metal free sample preparation, chemically isolating the uranium and thorium, measuring the thorium/uranium ratio by mass spectrometry allows the age of the fossil to be determined.

If modern lead, for example, from marine sediments or modern basalts has the composition of lead in the Earth and if the lead in the troilite phase of iron meteorites has the composition of primordial lead, then a simple model yields about 4.6 billion years for the age of the Earth.

This age is in good agreement with the age of the meteorites and the age of the Moon as determined independently.

Each sample analysis lasts for ∼4.3 min, and fifty samples can be measured in 12 h with an automated set up, after a day of sample preparation.

The use of different standard materials and laser systems had no significant effect on method accuracy.

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Gametogenesis, reproductive investment, and spawning behavior of the Pacific giant oyster Crassostrea gigas: evidence of an environment-dependent strategy . Publisher's official version : , Open Access version : Kooijman S (2009).

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