Which of the following methods is not used to date rocks more than 50,000 years old?

Question

Quizplus · Accepted Answer

Radioisotope dating of sedimentary rock cannot be used to date rocks more than 50,000 years old because the organic material that can be dated by radiocarbon methods is not found in sedimentary rocks. The other methods listed can be used to date rocks more than 50,000 years old, as they rely on different factors such as the decay of radioactive isotopes in igneous rocks, the orientation of magnetic minerals in rocks, or the analysis of fossils and their placement in the geologic record. Continental drift is a process that has taken place over millions of years and can provide information about the age of rocks through the study of plate tectonics, but it is not a direct method of dating rocks.

Which of the Following Methods Is Not Used to Date