Dating method for volcanic ash who is rita mae brown dating
Scientists currently don't have a technique for dating fossils like Lucy directly, but they can assign these fossils relative dates based on the age of layers of volcanic ash found above and below them.
Volcanic rock -- like the trail at Laetoli -- can be dated by a method called potassium-argon dating.This temperature is what is known as closure temperature and represents the temperature below which the mineral is a closed system to isotopes.For an element to be useful for geochronology measuring geological timethe isotope must be reasonably abundant and produce daughter isotopes at a good rate.They are believed to be the most ancient common ancestor, or "stem" species, from which all later hominids sprang. Estimating the age of hominid fossils is usually a painstaking, two-part process, involving both "absolute" and "relative" dating."Absolute" dating means finding a specific age for an object.