Some of the theorists who advocate this "revisionist" critique imply that, because the "pure hunter-gatherer" disappeared not long after colonial (or even agricultural) contact began, nothing meaningful can be learned about prehistoric hunter-gatherers from studies of modern ones (Kelly, 24-29; see Wilmsen)
What type of hunter-gatherer has disappeared ? (If the question is unanswerable, say "unanswerable")
pure hunter-gatherer