| A drawback is that the U content of the titanites is very low, making radiometric dating difficult. |
| For radiometric dating we selected from each zircon concentrate about 10-20 clean crystals with neither fractures nor inclusions. |
| In recent years radiometric dating of volcanic lavas, particularly in North Germany, has been used to redefine the PermianCarboniferous boundary. |
| The San Juan Member is late Oligocene based upon biostratigraphy and radiometric dating. |
| Of these artifacts, the material best suited for radiometric dating was a set of bone awls. |
| What is interesting about chondrules is that radiometric dating has put them among the first solids to have formed in the solar nebula. |
