| 21. | After the discovery of radioactivity, radiometric dating methods were developed, starting in the 20th century.
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| 22. | Radiometric dating has shown that the earliest known stromatolites are over 3.4 billion years old.
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| 23. | His primary field was radiometric dating, which was transforming the field of geology in the 1950s.
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| 24. | Radiometric dating measures the steady decay of radioactive elements in an object to determine its age.
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| 25. | Three major tools are used to date the CRBG flows : stratigraphy, radiometric dating, and magnetostratigraphy.
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| 26. | Subsequent fieldwork, metamorphic studies and radiometric dating has refined their chronology but supported their original hypothesis.
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| 27. | The age of the impact structure is somewhat contentious, in the absence of any radiometric dating.
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| 28. | For older fossils or actual rocks, you use radiometric dating ( as I think it's called ).
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| 29. | Radiometric dates of 1883-1870 Ma are reported for mafic, ultramafic, carbonatite and lamprophyre intrusions within the Trough.
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| 30. | This technique is known as radiometric dating.
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