the circumstances of the object may allow one to say that one object is older than another without being able to assign a particular age to the objects.for example: if an archaeologist is studying past civilizations, the archaeologist may be able to say that in a particular location the ruins of once civilization were found to have been build on another and so the layers unearthed in an excavation convey the sequence of historical occupations without revealing the actual dates.
 dating of different minerals and/or isotope systems (with differing closure temperatures) within the same rock can therefore enable the tracking of the thermal history of the rock in question with time, and thus the history of metamorphic events may become known in detail.
this scheme is used to date old igneous and metamorphic rocks, and has also been used to date lunar samples.
example of short-lived extinct radionuclide dating is the 26al – 26mg chronometer, which can be used to estimate the relative ages of chondrules..
there are numerous isotopes of uranium, each with its own distinct.
we have an undiscovered element, parentium, that has a radioactive.
’s note: as creation magazine has been continuously published since 1978, we.