Dating methods wiki
Pa, and this process is often used to check the results of uranium–thorium dating.Uranium–thorium dating is commonly used to determine the age of calcium carbonate materials such as speleothem or coral, because uranium is more soluble in water than thorium and protactinium, which are selectively precipitated into ocean-floor sediments, where their ratios are measured. Th is a remnant from a period when different isotopes were not recognised to be the same element and were given different names."Near the end you imply that low petrologic type chondrites are the most easily dated.Actually, meteorites that formed by melting, e.g., the various types of achondrites, usually give more precise ages.
There are well-known methods of finding the ages of some natural objects.Thus, although "extinct", these nuclides are present in meteorites, but produced by a more recent process.