The most primitive type of meteorites are called chondrites, because they contain little spheres of olivine crystals known as chondrules. There are 3 important things to know about the ages in Table 1. Thus both the approximate age and a high time resolution can be obtained. If P1 is not changed, the age will at least have geological significance. There are also processes taking place within a magma chamber that can cause differences in the composition of the magma from the top to the bottom of the chamber, since one might expect the temperature at the top to be cooler. Many other examples of paraconformities and other types of gaps in time, like these, have been described and no one seems to have a very good explanation for them. Are you sure you want to delete this answer?






The human element is also important here.

Why is it almost impossible to date sedimentary rocks using radiometric dating techniques?
Cornell University. Dating rocks by radioactive timekeepers is simple in theory, but almost all of the different methods except for the isochron methods — see below rely on these few basic assumptions: The heat of the impact melted some of the feldspar crystals in the granitic rocks of the impact zone, thereby resetting their internal radiometric clocks. This would leave us with a 0. For example, many isochrons used to date meteorites are most probably the result of mixing since they are based on whole-rock analysis, not on crystalline analysis. York D, Dalrymple, GB.







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