| 1. | The test is performed by Isotope Ratio Mass Spectrometry ( IRMS ).
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| 2. | It has low Sr and Pb isotope ratios and high Nd ratios.
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| 3. | The evidence suggests, Showers said, that the original isotope ratios remain reasonably intact.
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| 4. | This sort of graph is based on another of isotope ratio versus time.
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| 5. | The oxygen isotope ratios in their shells are used as proxies for temperature.
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| 6. | Isotope tracers are commonly used in the form of isotope ratios.
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| 7. | The relative abundances of different isotopes can then be measured, yielding isotope ratios.
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| 8. | However, this evidence can be confounded by other factors recorded by isotope ratios.
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| 9. | Together, these processes allow the analysis of extreme isotope ratios above 10 12.
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| 10. | Hydrogen isotope ratios in dinosterols can serve to reconstruct salinity semi-quantitatively.
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