Taking early ruins of the old Stone Age in Donggutuo as axis and taking 10-25 km as radius, we can confirm the action range of Nihewan ape-man.
以东谷坨旧石器早期遗址群为轴点，以10 - 25公里为半径，可以确定泥河湾古人类活动的范围。
2
According to the records of early human activities, Nihewan strata is an invaluable geological relic that has undergone the evolution of the earth and creations since the later Cenozoic Era.
记录中国北方晚新生代以来地球演化、生物进化与古人类活动的“泥河湾层” ，是珍贵的地质遗迹。
3
Thus we can infer that Nihewan ape-man may either rest under the bare cliff of the Gorge Area or be buried in the marsh country or deep in the lake bed, or in the accumulation layer of the cavern.