31. Theoretically, such stable isotopes could include the radiogenic daughter products of radioactive decay, used in radiometric dating . 32. There exist many results of radiometric dating from the Bohemian Massif like zircon, muscovite or monazite ages. 33. They are obtained with different radiometric dating methods depending on the type of rock and its age. 34. By the early 20th century, radiometric dating allowed the Earth's age to be estimated at two billion years. 35. No great push to embrace radiometric dating followed, however, and the die-hards in the geological community stubbornly resisted. 36. Which radiometric dating technique is used? 37. The next major advance in understanding reversals came when techniques for radiometric dating were developed in the 1950s. 38. Subsequent radiometric dating reduced the uncertainty. 39. Radiometric dating has shown the age of the Germanic Trias is not totally corresponding with the Triassic period.40. But a more definite age may come from radiometric dating of samples from the sediments, brought back from China.
