Question

Morphological types become useful temporal types if their frequencies change significantly through time and they are restricted in time. true

Answer 1

True. A morphological type can be a useful temporal type when subjected to a change and restriction of time. Example,  a morphological type that occurs only in strata dating between 1500 BP and 1000 BP can elevate into a temporal type. It is because artifacts that belong to the temporal turn up into an undated context.