How to Date Dinosaurs

Zircon crystals are useful for dating stuff that's super duper old. They reject any lead and expel it from inside the crystal so when they're formed they're like lead-free but they do take uranium in them and uranium decays into lead so each one is like a little clock if you pick up a zircon crystal and measure how much lead is inside of it you can tell when it was formed. Then you measure in the rock around the fossils or somethingYeah exactly now dinosaur bones don't have this stuff in them but sometimes around the dinosaur bones there's like cooled magma so these igneous rock could be used to date dinosaurs.