Relative dating is used to determine the order of events on Solar System objects other than Earth; for decades, planetary scientists have used it to decipher the development of bodies in the Solar Systemparticularly in the vast majority of cases for which we have no surface samples. A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research. For example, they have learned that the Mississippi River formed many millions of years after the Grand Canyon began forming. The Tulane trash pit has an old license plate in the Tin Cans layer. This is not uncommon. The geological time scale is far from dogma.
Geologic time is finely subdivided through most of the Phanerozoic see Harland et al.
Geological Time Scale
The formation of melt inclusions appears to be a normal part of the crystallization of minerals within magmas, and they can be found in both volcanic and plutonic rocks. I thought it would be useful to present an example where the geology is simple, and unsurprisingly, the method does work well, to show the quality of data that would have to be invalidated before a major revision of the geologic time scale could be accepted by conventional scientists. This is because it is not possible for a younger layer to slip beneath a layer previously deposited. Melt inclusions are small parcels or "blobs" of molten rock that are trapped within crystals that grow in the magmas that form igneous rocks. Correlation of Rock Units In order for rock units to be correlated over wide areas, they must be determined to be equivalent.