Suggested explanations for the discrepancy include that "variations in fossil abundance through time skewed Vrba's data, creating a false peak" or that the "Turkana rift valley—which held a river bounded by woodland at this time—was buffered from the dramatic climatic shifts".
Possible explanations for the discrepancy include that variations in fossil abundance over time skewed Vrba's data, resulting in a false peak, or that the Turkana rift valley—which had a river bordered by woodland at that time—was shielded from the significant climatic shifts.