The Pierre Shale, which is divided into identifiable sedimentary beds called members, also contains abundant fossils of numerous species of ammonites, ancestors of the chambered nautilus. Creationists who wants to dispute the conclusion that primitive meteorites, and therefore the solar system, are about 4. In the case of our hypothetical example, we might assume that no one has gone into the room and added dust, or blown dust away using a fan. But we must still make an assumption about the rate at which dust accumulated in the past. We know the exact day of this eruption because Pliny the Younger carefully recorded the event. This rising body of magma is an open system with respect to the surrounding crustal rocks. Cecie Starr Glencoe:
Such mixings can produce arbitrary isochrons, so these cannot be detected by any mixing test.
Acknowledgments I thank Chris Stassen and 2 anonymous reviewers for their thoughtful comments, which led to important improvements in the manuscript. That is, the more daughter product relative to parent product, the greater the age.