You will be given a definition of a task first, then some input of the task.
Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

Previous to isotopic dating sections of materials or uh rocks had to be dated using fossils and stratigraphic correlation relative to what?
Output:
Previous to isotopic dating sections of rocks had to be dated using fossils and stratigraphic correlation relative to what?